Modeling - Science topic

Could it be that this is not an either or question, but that the two possibilities are equivalent, that is, that the two different conceptual reference frames are equally valid?

Their article posted on arXiv May 8, 2025 is at: https://arxiv.org/abs/2505.02645.

I'm currently working on underground hydrogen storage (UHS) in saline aquifers and focusing on the dispersion behavior in complex geological formations. I’m exploring simulation methods like LBM and would like to hear from others with experience in similar modeling or storage projects.

Hi All

I need a researcher who is familiar in modeling liquefaction of soil in earth fill dams by any software, for example ABAQUS, Geostudio, FLAC....etc.

The person would be a co-author of a research paper which is being published in an international journal with a high impact factor.

Best regards

Dr.-Ing. Nazim Nariman

009647702210546 Whatsapp + Viber

I noticed a quite interesting paradox. In modeling the impact of temperature on mortality, DLNMs (Distributed Lag Non-linear Models) are considered a kind of gold standard. I understand the allure, as they neatly model the delayed impact of low temperatures increasing the spread of respiratory infections or of heatwaves, when an initial mortality spike is followed by subsequent below-trendline mortality.

There are a few known problems, like DLNMs’ tendency to correctly match spikes of mortality during heatwaves; thus, when extrapolating, they achieve spectacularly high numbers that later completely overshoot observational data.

Nevertheless, I notice an even more serious problem: they assume the relationship remains effectively constant or, in fancier models, assume some modest adaptation. By crunching larger datasets on seasonality, I noticed consistent shifts in mortality seasonality completely overshadowing any impact of climate change. For assumptions to hold, seasonality should have remained mostly constant over decades until starting to shift in the 1970s due to a changing warming trend. Yet, historical data (STL-extracted cycles) show the opposite. Any ideas? (Especially how to recalibrate DLNMs to match historical data?)

I'm exploring whether the Friedmann equation, typically used to describe the large-scale structure of the universe, can be reframed as a nested oscillatory system when considered within a quantum cosmological framework.

Recent works, such as those by Matone & Dimakis (2024), suggest that a linearized form of the Friedmann equations reduces to a WKB-like expansion of a quantum cosmological wave equation. This brings up the possibility that the quantum scale factor itself behaves as a standing wave, whose dynamics may recursively couple across temporal and curvature scales.

From the perspective of the Oscillatory Dynamics Transductive-Bridging Theorem (ODTBT), I am particularly interested in modeling this structure as a transductive sine-cosine field, where curvature, time, and mass evolve through nested phase dynamics. The TWIST (Threshold Waveform Interaction for State Transformation) provides a boundary framework for state changes between classical expansion, quantum collapse, and informational decoherence.

I'm especially interested in:

Any insights, citations, or collaborative leads would be greatly appreciated.

Prostate cancer in situ modeling method, how to ensure uniformity, we have done it several times, the tumor size deviation is too large.

What is hybrid SEM-ANN approach of modeling?

Hello everyone,

I am currently working on modeling a life cycle assessment (LCA) for 1 m³ of concrete using GaBi. Instead of relying on the default datasets, I would like to model each life cycle stage from A1 to A5 individually to better reflect actual conditions.

As part of this, I want to create a custom cement manufacturing process. My questions are:

Any guidance, examples, or references would be greatly appreciated. I'm especially looking to represent the A5 stage (construction activities like concrete placement) as well.

Thank you in advance!

The STEM Modeling Competency scale or the Modeling Ability Checklist would also be greatly appreciated if anyone has access to them!

I have a theoretical model that naturally extrapolates to the weakening of dark energy through the mechanism of spacetime phase transitions, but I've never been able to complete the modeling because my math skills are so poor, should I give up?I give up?

会议征稿：第二届模型、自然语言处理与机器学习国际学术会议（CMNM 2025）

Call for papers：2025 2025 2nd International Conference on Modeling, Natural Language Processing, and Machine Learning (CMNM 2025) will be held from May 16 to 18 in Fuzhou, China.

大会官网(投稿网址）：https://ais.cn/u/IZ7z2a

大会时间：2025年5月16-18日

大会地点：中国-福建福州

提交检索：EI Compendex, Scopus

由阳光学院主办的第二届模型、自然语言处理与机器学习国际学术会议（CMNM 2025）将于2025年5月16-18日在福州举行。会议主要围绕模型、自然语言处理与机器学习等研究领域展开讨论。会议旨在为从事模型、自然语言处理与机器学习研究的专家学者、工程技术人员、技术研发人员提供一个共享科研成果和前沿技术所有的投稿都必须经过2-3位组委会专家审稿，经过严格的审稿之后，最终所有录用的论文将由ACM International Conference Proceedings Series出版，见刊后提交至EI Compendex, Scopus检索。，了解学术发展趋势，拓宽研究思路，加强学术研究和探讨，促进学术成果产业化合作的平台。大会诚邀国内外高校、科研机构专家、学者，企业界人士及其他相关人员参会交流！

建模工具与语言

建模与仿真方法

视觉与可视化技术

可视化和建模中的感知问题

实时建模与仿真

分析与控制

动态建模与仿真

基于Web的仿真

仿真优化

......

2级表示和处理

对话框系统和多模式系统

智能接口

文本处理辅助工具

机器翻译

自然语言理解

机器翻译

信息检索

......

智能数据分析 建模和识别  多任务和迁移学习 机器学习算法 深度学习 人工智能  智能搜索  数据挖掘

......

会议投稿经过2-3位组委会专家严格审核后，最终所录用的论文将被ACM ICPS (ACM International Conference Proceeding Series)出版论文集，并提交至ACM Digital library，EI Compendex, Scopus检索。

所有参会人员可申请口头演讲以及海报展示，可开具中英文证明：

①作者参会：提交全文，一篇文章允许一名作者免费参会；

②口头演讲：申请口头报告，时间为15-20分钟；

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I am modelling a cold-formed ledger frame structure and have screw connection data for both pure shear and pure tension. I used a Cartesian align connector and input shear and tension stiffness values. However, my loading condition involves a combination of both shear and tension, resulting in screw pull-out failure. My FEA results are significantly stiffer than the experimental data, and I suspect that the screw stiffness is overestimated since I defined stiffness separately for pure shear and pure tension. Can anyone help with this?

TD-DFT

Were the Tehran faults formed as a result of the movement of the Caspian Sea plate towards the Alborz Mountains?

The seismically active Alborz mountains of northern Iran are an integral part of the Arabia-Eurasia collision. Linked strike-slip and thrust/reverse-fault systems in this mountain belt are characterized by slow loading rates, and large earthquakes are highly disparate in space and time. Similar to other intracontinental deformation zones such a pattern of tectonic activity is still insufficiently understood, because recurrence intervals between seismic events may be on the order of thousands of years, and are thus beyond the resolution of short term measurements based on GPS or instrumentally recorded seismicity. This study bridges the gap of deformation processes on different time scales. In particular, my investigation focuses on deformation on the Quaternary time scale, beyond present-day deformation rates, and it uses present-day and paleotectonic characteristics to model fault behavior. The study includes data based on structural and geomorphic mapping, faultkinematic analysis, DEM-based morphometry, and numerical fault-interaction modeling. In order to better understand the long- to short term behavior of such complex fault systems, I used geomorphic surfaces as strain markers and dated fluvial and alluvial surfaces using terrestrial cosmogenic nuclides (TCN, 10Be, 26Al, 36Cl) and optically stimulated luminescence (OSL). My investigation focuses on the seismically active Mosha-Fasham fault (MFF) and the seismically virtually inactive North Tehran Thrust (NTT), adjacent to the Tehran metropolitan area. Fault-kinematic data reveal an early mechanical linkage of the NTT and MFF during an earlier dextral transpressional stage, when the shortening direction was oriented northwest. This regime was superseded by Pliocene to Recent NE-oriented shortening, which caused thrusting and sinistral strike-slip faulting. In the course of this kinematic changeover, the NTT and MFF were reactivated and incorporated into a nascent transpressional duplex, which has significantly affected landscape evolution in this part of the range. Two of three distinctive features which characterize topography and relief in the study area can be directly related to their location inside the duplex array and are thus linked to interaction between eastern MFF and NTT, and between western MFF and Taleghan fault, respectively. To account for inferred inherited topography from the previous dextral-transpression regime, a new concept of tectonic landscape characterization has been used. Accordingly, I define simple landscapes as those environments, which have developed during the influence of a sustained tectonic regime. In contrast, composite landscapes contain topographic elements inherited from previous tectonic conditions that are inconsistent with the regional present-day stress field and kinematic style. Using numerical fault-interaction modeling with different tectonic boundary conditions, I calculated synoptic snapshots of artificial topography to compare it with the real topographic metrics. However, in the Alborz mountains, E-W faults are favorably oriented to accommodate the entire range of NW- to NE-directed compression. These faults show the highest total displacement which might indicate sustained faulting under changing boundary conditions. In contrast to the fault system within and at the flanks of the Alborz mountains, Quaternary deformation in the adjacent Tehran plain is characterized by oblique motion and thrust and strike-slip fault systems. In this morphotectonic province fault-propagation folding along major faults, limited strike-slip motion, and en-échelon arrays of second-order upper plate thrusts are typical. While the Tehran plain is characterized by young deformation phenomena, the majority of faulting took place in the early stages of the Quaternary and during late Pliocene time. TCN-dating, which was performed for the first time on geomorphic surfaces in the Tehran plain, revealed that the oldest two phases of alluviation (units A and B) must be older than late Pleistocene. While urban development in Tehran increasingly covers and obliterates the active fault traces, the present-day kinematic style, the vestiges of formerly undeformed Quaternary landforms, and paleo earthquake indicators from the last millennia attest to the threat that these faults and their related structures pose for the megacity.

Abdollah Saidi added a reply

February 24

No, The north Tehran fault is a stuctucture resulting of conversion of Arabia to Eurasia. There is no any north - soutth conversion mouvement betwin Eurasia stable super continent and Iranian plate.

ResearchGate thinks that I am a co-author of "Techniques for cetacean–habitat modeling" (https://www.int-res.com/articles/meps2006/310/m310p271.pdf), but I am A. L. Read at the University of Oslo, not A. Read at Duke University!

Cheers, A. L. Read

Were the Tehran faults formed as a result of the movement of the Caspian Sea plate towards the Alborz Mountains?

The seismically active Alborz mountains of northern Iran are an integral part of the Arabia-Eurasia collision. Linked strike-slip and thrust/reverse-fault systems in this mountain belt are characterized by slow loading rates, and large earthquakes are highly disparate in space and time. Similar to other intracontinental deformation zones such a pattern of tectonic activity is still insufficiently understood, because recurrence intervals between seismic events may be on the order of thousands of years, and are thus beyond the resolution of short term measurements based on GPS or instrumentally recorded seismicity. This study bridges the gap of deformation processes on different time scales. In particular, my investigation focuses on deformation on the Quaternary time scale, beyond present-day deformation rates, and it uses present-day and paleotectonic characteristics to model fault behavior. The study includes data based on structural and geomorphic mapping, faultkinematic analysis, DEM-based morphometry, and numerical fault-interaction modeling. In order to better understand the long- to short term behavior of such complex fault systems, I used geomorphic surfaces as strain markers and dated fluvial and alluvial surfaces using terrestrial cosmogenic nuclides (TCN, 10Be, 26Al, 36Cl) and optically stimulated luminescence (OSL). My investigation focuses on the seismically active Mosha-Fasham fault (MFF) and the seismically virtually inactive North Tehran Thrust (NTT), adjacent to the Tehran metropolitan area. Fault-kinematic data reveal an early mechanical linkage of the NTT and MFF during an earlier dextral transpressional stage, when the shortening direction was oriented northwest. This regime was superseded by Pliocene to Recent NE-oriented shortening, which caused thrusting and sinistral strike-slip faulting. In the course of this kinematic changeover, the NTT and MFF were reactivated and incorporated into a nascent transpressional duplex, which has significantly affected landscape evolution in this part of the range. Two of three distinctive features which characterize topography and relief in the study area can be directly related to their location inside the duplex array and are thus linked to interaction between eastern MFF and NTT, and between western MFF and Taleghan fault, respectively. To account for inferred inherited topography from the previous dextral-transpression regime, a new concept of tectonic landscape characterization has been used. Accordingly, I define simple landscapes as those environments, which have developed during the influence of a sustained tectonic regime. In contrast, composite landscapes contain topographic elements inherited from previous tectonic conditions that are inconsistent with the regional present-day stress field and kinematic style. Using numerical fault-interaction modeling with different tectonic boundary conditions, I calculated synoptic snapshots of artificial topography to compare it with the real topographic metrics. However, in the Alborz mountains, E-W faults are favorably oriented to accommodate the entire range of NW- to NE-directed compression. These faults show the highest total displacement which might indicate sustained faulting under changing boundary conditions. In contrast to the fault system within and at the flanks of the Alborz mountains, Quaternary deformation in the adjacent Tehran plain is characterized by oblique motion and thrust and strike-slip fault systems. In this morphotectonic province fault-propagation folding along major faults, limited strike-slip motion, and en-échelon arrays of second-order upper plate thrusts are typical. While the Tehran plain is characterized by young deformation phenomena, the majority of faulting took place in the early stages of the Quaternary and during late Pliocene time. TCN-dating, which was performed for the first time on geomorphic surfaces in the Tehran plain, revealed that the oldest two phases of alluviation (units A and B) must be older than late Pleistocene. While urban development in Tehran increasingly covers and obliterates the active fault traces, the present-day kinematic style, the vestiges of formerly undeformed Quaternary landforms, and paleo earthquake indicators from the last millennia attest to the threat that these faults and their related structures pose for the megacity.

How to check Temperature-time curves via the tests and FE modelling using Abaqus software.

I am using T-learner approach for uplift modeling, with two separate models for treatment and control. They predict the counterfactuals and compute the uplift as the difference between the two predictions. I went to know witch metrics capture the quality of the uplift estimates (evaluate the uplift predictions) ? especially with continuous outcomes, where the problem is that the true uplift is never observed for an individual (you can't have both treated and control outcomes for the same person), so traditional metrics like MSE on uplift aren't feasible, and metrics like AUUC, Qini are For binary outcomes (e.g., conversion/no conversion).

I am trying to model pinned supports for a rectangular RC floor slab in Abaqus. Does anyone know a good way of doing so? I am new to Abaqus software.

The integration of renewable energy sources (RES) into power grids presents a multifaceted optimization challenge due to the inherent variability, intermittency, and uncertainty associated with solar, wind, and other renewables. Traditional linear programming (LP) methods have been widely employed for capacity planning, economic dispatch, and grid optimization due to their computational efficiency and mathematical tractability. However, given the increasing complexity of modern power systems, stochastic programming (SP) has emerged as a powerful alternative, offering robust decision-making capabilities under uncertainty by incorporating probabilistic scenarios and risk-aware optimization techniques.

While both LP and SP have demonstrated efficacy in optimizing renewable power integration, fundamental questions remain regarding their comparative performance, computational trade-offs, and potential hybridization strategies for maximizing grid efficiency, reliability, and economic feasibility.

This raises several critical research questions:

I invite researchers and industry experts specializing in power system optimization, energy economics, uncertainty modeling, AI-driven grid management, and hybrid decision science to contribute insights on:

I started a new project on ABM for criminology and bumped on GIS and crowds movements. What I need is to simulate the movement of people commuting to work every day in a map extracted from OpenStreetMaps (OMS) platform. I program in Python, so a solution in Python would be ideal (and very convenient) for me. What library/toolbox/guide would you suggest for a newbie in GIS and simulation of crowds?

Dear Research Community,

I am modelling the stress-strain behaviour of FRP-confined concrete in ABAQUS. I have written a USDFLD sub-routine. My ABAQUS stress-strain curve follows the expected curve up to the peak stress. After that, the stress is overshot by about 5 MPa (which is about 8% higher than expected). The gradient of my ABAQUS curve is the same as the expected curve - just 5 MPa stress higher than expected in the post-peak region. What could be the problem, and how do I rectify it?

Any suggestions are welcome. Thank you.

Holly

Is Mice's best imputation technique for filling missing data and default values in the credit modelling datasets. I am trying to learn how to achieve accuracy but I am not able to get proper content for that. When you have 400 variables and you have around 47% of missing data with default values, how would we do that

We are going to study some MOFs, but I have no experience at all. I did some calculations using GROMACS, so now I have the following questions:

- as I understand, it is possible to evaluate the catalytic properties of a MOF using Monte Carlo simulations? Or is some other approach better?

- using modeling, it is also possible to evaluate adsorption, diffusion, storage and release (for example, of some drug)?

Are there any tutorials or at least an approximate description or algorithm of how to do all this? Maybe there are some very detailed articles?

Recently I used this equation, that I found from http://chemphys.space/thinks/ on Modelling Coke oxidation Kinetics. I got some interesting results, but I am not sure if my method is reliable. A drawback of my study is I performed the Modelling just using a single heating rate. However, I compared my results with Litrature values and it gives good approximation

I wrote down based on my analsysis I would love to hear comments

“A The proposed model demonstrates a significant advantage in its ability to integrate kinetic, diffusion, and structural factors, offering greater flexibility in analyzing coke oxidation kinetics. The results align well with the porosity characteristics of the studied samples. For catalysts with low coke content, the formation of relatively thin oxidized layers suggests diffusion plays a crucial role in controlling the reaction rate.

In this model, the reaction order n varies between 1.52–1.69 for C-2 and 1.33–1.41 for C-4, indicating an accelerating reaction at early stages. As the reaction progresses, a slower rate suggests diffusion becomes the dominant mechanism. This is further supported by the parameter m , which approaches -1, consistent with a transition to diffusion control.

A detailed analysis shows the model effectively captures both kinetic and diffusion behaviors, with the fitted parameters closely matching the D-3 model. However, unlike the pure diffusion Jander model ( n = -2/3 ), which shows weaker deceleration, the flexible model incorporates stronger acceleration and deceleration phases. This positions it as a modified Jander model that reflects both kinetic and diffusion influences.

While the Jander model emphasizes diffusion control, the flexible model highlights the interplay of chemical kinetics. Standard models like D1 and D2 lack deceleration terms, and D-4 includes only weak deceleration. The Jander model, although somewhat comparable, underrepresents the acceleration observed. Notably, none of the D1–D4 models account for the power-law behavior observed in this system ( n \approx 1.5 ), suggesting enhanced kinetics compared to classical diffusion-limited frameworks.

The derived non-linear approximation equation underscores the coexistence of kinetic and diffusion-controlled regimes, distinguishing this model from traditional approaches.”

Looking for one knowledgeable in modelling ANN for prediction using MATLAB

Which software is suitable for modeling anisotropic stress behavior of different rock variants during thermal heating? COMSOL/ABAQUS/ANSYS

If COMSOL, then which module should be proceeded with for 2D and 3D modeling of thermal and stress distribution in rock variants.

I am modeling the paddy crop suitability for future scenarios using RCP2.6 and RCP8.5 datasets. I have included soil, climate and topographical variables and also land use/ land cover (for the year 2023). Can I use this LULC (2023) for projecting paddy crop suitability under future scenarios? Though this LULC is an important variable in deciding the suitability, it is a dynamic variable also. can it be used for 2050 projection?

I want to estimate a model for an affordance perception and actualization dataset. Participants estimated their max overhead reaching height without jumping, their max jump height without reaching, and their max reach-while jumping height. They also performed these behaviors

My goal is to estimate a model (regression or otherwise) that predicts jump-while-reaching reports/behaviors as a function of jump-without-reach and reach-without-jump reports/behaviors. Any suggestions about how to estimate this model would be much appreciated. Thanks and happy sciencing!

i am trying to use this approach

I am modeling particle tracking in a smooth/rough fracture using the Particle Tracing Module in COMSOL, with fluid flow via a stationary study solved for Navier-Stokes equation. Despite setting "freeze" and "bounce" boundary conditions on the fracture walls, particles stick to the boundaries and follow the parabolic flow velocity, rather than exhibiting random motion. I also introduced Brownian forces by modeling the particles as nanoparticles besides drag and gravitational forces, but the behavior remained unchanged.

Does anyone have insights on why the particles adhere to the wall or suggestions for achieving realistic particle dynamics? Any advice would be greatly appreciated.

Hello folks, I want to find a simple model to simulate landslide. Do anyone know any software or open source written by python?

I Googled this question on November 24, 2024.

The AI Google answer was:

"No, allometric scaling is not the inverse of Galileo differential scaling, but rather a change that deviates from isometry."

I think the AI answer is wrong. Reasons are in various RG articles, such as

Suppose the AI Google answer were correct. Why would an organism deviate from isometry? Are there articles that support the deviation from isometry point of view?

In LLC Resonant converts i can apply in small signal modeling using Extended describing function (EDF) ? Why not applying for Average modeling in LLC resonant converters ?

How to perform structural equation modeling through machine learning?

I am a student at the University of Washington Bothell campus. I and two other students have joined one of our professors in the electrical engineering department for a research project and were tasked with getting a Celllink Inkredible+ bioprinter up and running and eventually print something useful. He kind of left it up to us to figure things out. The printer was given to the professor by one of his colleagues so there are some parts missing but most of it is intact. I was wondering what type of 3D modeling software is compatible with the device? I have downloaded the Slic3er and Repetier software packages but it looks like I need to get some actual modeling software too. I and the other students are fairly new to 3D printing and any help would be greatly appreciated thanks. Also if this is not the appropriate forum for this type of question would anyone know of a place that is?

When I have limited GFRP material properties, Are there any typical values or industry standards I can rely on for modeling the GFRP wrap in this case?

Dear colleagues, What do you think of these results obtained by modelling a selective surface for radiative cooling? The map is drawn for some regions in Europe and Africa and specifically in Algeria.

I am modelling a hyperelsatic and viscous material in ABAQUS. I have calculated the hyperelasticity parameters using curve fitting. Now, for viscoelasticity, I have stress relaxation results in terms of shear modulus variation with time. While inputting the data into Abaqus, you need two parameters G0 and Ginf along with the experimental results. So i think G0 is the shear modulus at the beginning of relaxation test and Ginf is defined based on hyperelastic parameter(2*C0 for Yeoh Or similar for other models)? Am I correct or else?

Please help me by sending the example or handout for conducting Meta-analytic structural equation modeling by imputing continuous or binary data.

I usually use R software.

Can someone point me in the right direction for export coefficients for modeling Pollutant modeling. Thanks in advance.

........

I need to design a trimer of scFv using an open chain monomer. I did this by modelling open chain of monomer followed by docking to form a closed structure. Issue is that I want to move VH or VL part of scFv so that it can form interactions in the form of a triangle.

Is there a way to move one part of a chain? Move VH while VL that is locked in place. Any software that can do move part within a molecule?

Molecule is a single chain, no breaks.

Can the CDP (Concrete Damage Plasticity) model or the Hashin Damage model be effectively used for modeling the behavior of engineered cementitious composites (ECC) in finite element analysis (FEA)? Additionally, what are the key factors that should be considered when choosing between these two damage models for accurately capturing the mechanical and damage characteristics of ECC, such as cracking, strain hardening, and failure modes?

if we are modeling a infectious disease via compartmental method and while fitting original historical data very nicely. we get negative parameters.! Means we fit original data nicely with the model data only with negative parameters, then is it ok or where the problem lies? if any one has got a idea please let me know. Thanks

I need some examples of HTS modeling

THANK YOU

I have read many research articles related to COVID-19 modelling. Some authors fitted real-time data with the COVID-19 proposed model. Which method are they are using to fit correctly?

Thank you so much for your attention.

Hi Everyone

It's been a while that I've been trying to model a Concrete beam for bending test but the more I study about Concrete damage plasticity, the more I get confused.

I have read articles and watched videos but still can't calculate CDP parameters. Can anyone help me how to obtain compression and tension behaviour and its damage parameters?

Thanks

Best Regards.

Can I employ the GMM modeling for N=15, and T=5? And shall I use the estimates for the short run impact only, or the long as well?

Hello.

I'd like to model a blood flow inside a vein that is affected by external magnetic field on COMSOL.

For now, I know that i will be using laminar flow and magnetic fields module.

Is there any tutorial or beneficial source to learn how to do it?

Thanks

Hello!

i’m trying to model a portal frame with a tmd attached to it in ABAQUS , subject to seismic excitation. It would be a great help if anyone could provide a step by step guidance in doing so

Recently our team published a Plug-in for modeling of 3D RVE of unidirectional composites. You can check it in the following links:

1.

2. https://www.youtube.com/@engineering_software

3. www.engssoft.com

We appreciate it if respected researchers and users let us know their idea about required features and options that should be added in future versions of this plug-in.

Usually, additive manufacturing techniques like SEBM/SLS/SLM are used for interconnected porous structure generation of >100-200 micrometer. Is it possible to use Fused deposition modeling (FDM) for the same purpose?

Hi all,

I am a new PhD student working on modelling Zn-air batteries and I am new to modelling for batteries. I am reading all these battery models and research papers for contiuum model for batteries such as P2D and other models and most of the models are based on constant current discharge/charge models. Now, my research question is to model a battery for a constant resistance and I am not able to find any for that. Why is constant current discharge curves so much more prominent in battery modelling and what resources should I be looking at for constant resistance case? I appreciate any kind of help in understanding the system and any direction. Thanks!

PS. the battery I have will not be tested in constant current discharge experimental set up and instead is a constant resistance one.

Which software use to analysis the drought or software use in modeling drought?

Hi, I'm trying to use *MAT_77_H on LS-DYNA to modeling a sort of viscoelastic material, but i'm not familiar with the material type itself. What parameters do I need to enter for a Mooney-Rivlin & Maxwell viscoelastic material? Especially I read an article using 77_H and didn't figure out where to input the parameter G0 for viscosity.

Thanks for any reply.

How to use energy flexibility in inventory modeling?

CO2 Sequestration [Thermodynamics; Super-Critical CO2; Critical Temperature; Critical Pressure]

1.  When will the injected super-critical CO2 tend to approach its critical temperature (where, the properties of gaseous and liquid phase CO2 gets converged; resulting in only one phase @ critical point; and thereby becoming a homogeneous super-critical CO2 – as the heat of vaporization remains to be zero @ & beyond the critical)?

2.  Can we expect the temperature of the injected super-critical CO2, into the aquifer, to reach above the critical temperature @ any point (where, CO2 gets modified to a solid form with sufficient pressure, even though, CO2 cannot get translated into its liquid form with increased pressure)?

3.  How would we go about modeling the space- and time-dependent nature of CO2’s physical properties, if they, keep on oscillating between gaseous-phase properties and liquid-phase properties (for example, the density of super-critical CO2 tending to approach to that of the in-situ brine; viscosity of CO2 remaining similar to the actual CO2’s gaseous nature; while the diffusivity of CO2 keep oscillating between its respective gaseous- and liquid-states.)?

4.  What is the physical significance of having an elevated thermal conductivity of super-critical CO2 – near its critical point?

5.  Since, @ nearer to the critical point, CO2 is going to physically behave more like a gas, and, very less like a liquid, whether the surface tension of CO2 would tend to approach zero?

6.  When could we expect the pressure of the injected super-critical CO2 to reach above its critical point, where, the relative permeability of CO2 is expected to have a very steep gradient with pressure (associated with a high sensitivity on the density of CO2)?

7.  If the solubility changes and mass transfer ratios of CO2 remain to be very critical – nearer its critical point, then, how exactly, will we able to deduce the rate of dissolution of CO2 at the interface between top CO2 layer and its underlying formation brine layer?

Will we be able to capture the thickness of the newly developed interface layer (in between top layer with CO2; and bottom layer with initial in-situ brine) that remains relatively heavier than both initial CO2 gas and original in-situ brine?

Under such circumstances, would it remain feasible to distinguish between convective dissolution and diffusive dissolution that remains to be a complex of – not only, on the injected super-critical CO2, but also, on the nature aquifer rock properties and aquifer’s slope and bedding inconfirmity?

Suresh Kumar Govindarajan

Professor (HAG)   IIT-Madras

04-August-2024

Hi,

I am trying to model the transient response of a free-free beam (unconstrained) in ABAQUS, where the force is applied through a spring. I am using a two point spring where one end is connected to the beam and the other a reference point, the force is applied to this reference point.

When i visualise the results the spring is showing no results (white) even though I requested the the node set of the reference point.

The beam response is the same as it was without the spring no matter the choice of spring stiffness selected. So i assume the spring is incorrectly modelled.

Have i made a mistake when modelling the spring?

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Hi Everyone,

I am modelling the compresion test for auxetic structure. In order to perform a realistic analysis, I need to define contact for each cell faces. However, Abaqus gives error when I try to use general contact algorithm. Do you have any suggestions or idea about this issue? Thank you very much for your help,

Regards,

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Hi,

I need to know and possibly find a reference about When and by Which author the hexagon shape was first introduced to represent a composite (emergent variable) in Structural Equations Modeling.

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Modeling of different operating parameters for contamination removal by AOPs