Questions related to Simulators
I am trying to simulate Multiphase CHT problem. In my case, there are two fluids, air and water. I want to simulate water side as a Multiphase Mixture Model. Heat is rejected from air to water so I should simulate water side with airside but i can't define air side's cell zone conditions as air material. I tried to define air as a secondary phase(with vapor) but the air has became transformable to vapor and from water. Then analysis diverged. How can i define air material without defining as a phase?(Air and water do not mix. They are separated by wall.)
I would like to simulate an object in orbit using Abaqus, and I'm seeking advice on the appropriate boundary conditions to consider. Specifically, I'm interested in modeling how space debris might impact a cylindrical hull orbiting in space, but I'm not sure where to begin.
In my research, I have not found clear guidance on how to approach this simulation, including how the International Space Station (ISS) is typically modeled. I would appreciate any insights or recommendations on how to set up the simulation and which boundary conditions to include, such as initial position, speed, and fixed center of mass. Thank you in advance for your help.
Hello fellow Abaqus users,
I've been working with Abaqus for the past two years and have encountered a significant issue in my simulations related to the plastic deformation of sheet metals. Specifically, I am trying to simulate a two-stage process: the first stage involves the conventional deep drawing of a metal blank, and the second stage is referred to as "flattening," where another tool deforms the drawn blank in an attempt to make it flat by pushing it backward.
In my simulations, I'm using Abaqus Explicit, where the tools are modeled as rigid surfaces, and the blank is represented as an isotropic material using shell elements with a thickness of 1 mm.
The problem I'm facing is that when I impose a movement of 14 mm for the punch in the simulations, I obtain results indicating that the punch is moving only 13.52 mm. Similarly, in the flattening stage, I set the flattening dies to arrive at a distance of 1 mm, but they actually arrive at 0.8 mm. This discrepancy of just 0.2 mm in the final stage of flattening could significantly impacts the simulated force.
Here are some details about my simulation setup:
- Blank is modeled with shell elements (squares with 2 mm dimensions).
- I'm using the penalty method for contact (not kinematic contact).
- Tangential behavior is defined with a penalty of 0.15, representing the friction coefficient.
- Normal behavior is modeled as "hard contact" to prevent the blank from penetrating the tools, and detachment is allowed after contact.
I haven't made any significant modifications to other parameters, and I've used default configurations for shell elements in the mesh module. I also haven't implemented any contact control algorithms. Interestingly, I've noticed that this strange behavior of the rigid tools not reaching their intended positions doesn't occur when using 3D elements.
I did some mesh sensitivity and this seems not to be the problem.
My questions are:
1) how can I have a precise control on the movement of the tools in Abaqus? Form me having 0,5mm of difference can be problematic.
2) Do you think this issue is related to the mesh or some aspect of the contact algorithm? Or maybe related to the mesh?
I'd appreciate any insights or suggestions to help me resolve this problem and achieve more accurate simulation results.
Thank you in advance for your assistance!
I want to simulate a DPM model with mesh disc like the first attached image.(thickness 0.03mm, hole size 3um)
In the flow field, air and micro water droplets would go through this mesh disc(only circle area), so I define the circle area with many tiny holes as porous zone.
But I'm not sure how to calculate the viscous resistance, C0, C1, and porosity in the porous zone.
By the way, could I use this model to check if any water droplets within a range of diameters can go through the mesh?(since we cannot define the hole sizes on the porous zone)
I am studying the impact of land-use practices on Godavari subbasin. If there is a series of hydropower plants/reservoirs and its discharge is already altered by a human(dam operation).
in that case, how my SWAT simulated discharge will be checked and proved CWC gauge reading.
how do I study land-use practices and correlate with that discharge(already altered due to dam) in the study area with actual discharge?
I need help modelling horizontal BNWF with axial, transverse, and vertical (bearing & uplift) springs and spring damper at the ends to simulate connectivity.
I want to know how I can model these on to the beam and assuming the pipeline segment is 1 kilometer in length, at what intervals should the soil springs be applied? Can we assign line springs in OpenSees?
P.S I would like to validate my results through this paper "Seismic risk assessment of buried steel gas pipelines under seismic wave propagation based on fragility analysis - Vahid Jahangiri, Hamzeh Shakib" - DOI 10.1007/s10518-017-0260-1
I'm working in the field of optimization of filament winding process. My problem is that I couldn't find any way to simulate the effect of different tensions of fiber on the final products which are glass epoxy pipes. Does any body know how to do this work by CAE ABAQUS?
Thank you all
I am currently using GROMACS to simulate high salt concentrations but I am running into an issue with gmx genion. If I have a 30x30x30nm box and want to use -conc to bring it to say 4M, then I encounter the error: Not enough replaceable solvent molecules! Any thoughts or adivice are greatly appreciated. Thank you.
I was trying to reproduce the results of the paper "2-D drift-diffusion simulation of organic electrochemical transistors" with the OEDES python package. The available package on GitHub, however, only simulates 1-D devices. Does anyone know how to implement OEDES for 2-D devices?
Is it possible to simulate three-dimensional space in two-dimensional flow 3d? Is the result in two dimensions the same as in three dimensions?
I am encountering difficulties in employing Acusolve to simulate a basic landscape, whether it be from a raised or grounded source, which is proving to be a setback. In Acusolve, I am need to know how to include characteristics of H2S in the materials library. What is the suitable physics model in Acusolve for simulating H2S dispersion?
Can any one comment of Omnet++ and MATLab tool combination for implement a qualitative research findings in Mobile Edge Computing environment .I would like to simulate offloading technique in MEC.Let me know how far this combination will help me .
I am trying to simulate a double gate mosfet in 2D. Both top and bottom gates are named "gate" in the structure file and also the sdevice file.
Your help will be appreciated.
Option to make a random distribution is not available in COMSOL. I am trying make random distribution of fillers and assign properties to it. Any input regarding this would be much appreciated.
I am trying to simulate the combustion of black liquor solids from a soda process in Aspen Plus and the only information I have about the substance are ultimate analysis, organic/inorganic ratio and high heating value. I am trying to simulate the substance as a nonconventional substance using the GENANAL component attributes but am unsure how to specify data for each constituent in the mixture based off the ultimate analysis. Any help would be appreciated! Thank you
I am new to machine learning and need some guidance on how to develop and connect a python-based deep neural network to a network simulator. I am using NetSim. What data from the simulator should I use? What kind of ML applications are possible?
what the best tools for MEC.I mean in mobile edge computing environment to simulate mobility ,radio access networks, nodes and data exchange, delay calculations, ML algorithm implementation etc. what is the best tool for these requirements .
Hello, I'm am working on a liquid crystal antenna for my thesis work. I was trying to use this liquid crystal (LC) mixture GT7-29001 from Merck KGaA, Dramstadt, Germany.
From a research paper, I found the following information - GT7-29001 is an LC optimized for high-frequency band applications, and two dielectric constants were ε⊥ = 2.45 (tan δ⊥ = 0.0116) and ε∥ = 3.53(tan δ∥ = 0.0064) at 19 GHz, respectively, according to the datasheet provided by the Merck KGaA.
Please tell me if anyone can help me to -
- Get the datasheet provided by the Merck KGaA (I tried searching for it in internet but couldn't find it).
- To simulate this mixture as a substrate in any simulation software (HFSS, CST, ADS, MATLAB).
I am going to simulate the alloy having three elements in it. I want to know how to select the Pseudo Potential for different alloy elements.
I'm trying to simulate the pyrolysis process of an RDF sample in vertical tube furnace.
I like to include this reaction in my simulation using Comsol Multi-physics :
Cm Hn Ol + (m/2 - l/2)O2 => mCO+n/2H2
Should I identify the (m,n,l) as variables, if so how can I do it ?!
I was trying to use SILVACO ATLAS to simulate a GaN HEMT?
And there is a semi-insulating GaN layer.
Can anyone let me know what I should do with it??
I have been trying to simulate optical logic gates using COMSOL 5.6 software.
I have been trying to replicate the results of this article in order to learn the simulation method. Here is the link: https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=plasmonic+logic+gate+MIM+waveguide+comsol&btnG=#d=gs_qabs&t=1690146508321&u=%23p%3DliJIXWt-D1oJ
I have added ewfd and boundary mode analysis as study and I have added the input and output ports as well. But I am not sure if my approach is correct and I am not sure how to setup the boundary mode analysis.
Therefore I seek guideline and help for simulating optical logic gates. Thank you in advance.
Dear Friends and colleagues,
Is it possible to simulate Two-dimensional (2D) traffic flow using VISSIM? If so, can you provide some methods and examples? Your help is highly appreciated.
I am trying to simulate 2d sloshing tank phenomena with air and water as fluid. The water in the tank is filled upto 0.15m and total height of tank is 0.32m. The length of the tank is given as 0.57m. I want to provide velocity in the form Acos(wt). The point at which this excitation is in the center of tank and on the free water surface. I am not getting how to give this kind of excitation in fluent. Pls help me in this regard.
Hello everyone, I am currently using COMSOL to simulate the piezoelectric behavior of zinc oxide (ZnO) nanowires. I would like to add either PMMA or PDMS as the surrounding polymer material.
However, I have noticed that there are different types of PMMA and PDMS available. I would like to know the differences between them.
My second question is regarding the selection of PMMA and PDMS from the MEMS branch in COMSOL. COMSOL requires me to provide the coupling matrix, elastic matrix, and relative permittivity for these materials.Where can I find this information?
I hope you are doing great, I am working on offshore VAWT, and trying to simulate a vawt in ansys fluent. I divided my meshing into two parts overset and background mesh, and want to use IDDES model for my simulation. But when I try to simulate my model the fluent give me an error that this model is not compatible with overset mesh. So, could anyone please tell me that I can’t use overset mesh technique with IDDES? or I can use this technique by changing any solver setting?
Thank you so much for your time!!
I need to implement some PE with different PIR in network on chip. Are there anyone to help me?
I am trying to know how it is possible in NOXIM and BookSim. But, up to now, I dont get any result..
I am trying to simulate Friction Stir welding using the CEL method. I have resolved all other errors except this particular error. Someone kindly help me with this. I have attached the CAE file.
I simulated a copper coil in comsol, applied a pulse excitation current to the coil, and set a probe around the coil to measure the potential. I used the mef module and transient research, but it reported an error in the end. I am going to try I tried the frequency domain to time domain FFT research, but I don't know how to connect the time domain pulse signal with the frequency domain. I hope to get your help, thank you!
There are detailed model diagrams and pulse diagrams below.
No biaxial stress limit given. Default f12 used.
104 nodes are common between the tied pair. no constraint is formed for these nodes. The nodes have been identified in node set WarnNodeCommonTiedPair.
*tie between surface pair (assembly_cz_surf,assembly_b_srf) is reverted back to type node-to-surface. This case may happen if type surface-to-surface cannot find nodes to tie together or if default acoustic-structural tie is specified involving shells. Please check the surface definitions or specify type=surface to surface for acoustic-structural tie.
For *tie pair (assembly_cz_surf-assembly_b_srf), not all the nodes that have been adjusted were printed. Specify *preprint,model=yes for complete printout.
52 nodes have been adjusted. The nodes have been identified in node set WarnNodeAdjust.
*tie between surface pair (assembly_cz_surf,assembly_t_srf) is reverted back to type node-to-surface. This case may happen if type surface-to-surface cannot find nodes to tie together or if default acoustic-structural tie is specified involving shells. Please check the surface definitions or specify type=surface to surface for acoustic-structural tie.
For *tie pair (assembly_cz_surf-assembly_t_srf), adjustment was specified but no node was adjusted more than the adjustment distance = 2.22000e-16.
I want to simulate the SLM process, but can not decide to use which software (Flow 3D, Ansys Additive, and COMSOL Multiphysics).
The control over the process parameters including the beam parameters are desired to perform the analysis. The simulation's main goal to relate process parameters and thermal stresses.
For simulating a time periodic flow, I increased simulation times up to 100s and use adaptive time steps.
But I didn't get desire result...I checked simulation setup several times...I don't know why CFX results are different from Analytical solution?
CFX simulation take about 20 days.
*may be by increase the simulation time get a better result!
what do you think?
how far can Artificial Intelligence simulate and replicate human capabilities? Can it extend to the human abilities such as discovery and Inspiration?
Is scientific approach capable of answering this question at present or should we employ a rational reasoning approach? what would be that rational reasoning approach then?
As a title question, my project obtains 2 parts: Antenna array and PA PCB. I would like to simulate the effect of nearfiled antenna to PCB (impedance matching, losses). I tried to import the field source of antenna to PA Schematic and run Time-solver but it doesnt work.
Pls help me to correct the flow of simulation.
I am new to LAMMPS, and trying to learn how to simulate liquid molecular environments, I was looking for a way of generating input structure files, I've come across so many different software (such as vmd and its plugins which is not user friendly and was a waste of time), does anyone know any good tutorial to learn how to build such input file (if we don't use already available pdb files)? I am quite familiar with Gaussian, is there any way to get the structure of one molecule from the Gaussian and build the pdb file based on that? I understand that we probably need more than one molecule as the input molecular structure.
I would like to change the 5QI parameter and observe its impact on latency and packet delivery. To accomplish this, I require an emulator or simulator capable of simulating 5G communication and supporting 5QI. It is preferable that I can modify the 5QI during runtime. I am aware that, in a real scenario, this can be achieved by utilizing PDU session modification. However, I have been unable to find a simulator that offers this feature. As a result, an alternative option would be to terminate the existing PDU session and create a new one. Could you please suggest an emulator or simulator that supports 5QI and ideally 5QI modification? Additionally, I would greatly appreciate a brief explanation of how I can perform these actions.
Thank you in advance for your assistance.
I am using COMSOL Multi-physics simulator with Darcy's law and level set module for modelling the mold filling simulation. However, using these two physics I was able to detect only macro-voids. Now I Have to analyze the mesoscopic and microscopic voids along with the macroscopic voids.
Can I use the Richards equation for analyzing the same.
Suggest if any other module/physics I can incorporate for studying the dual scale flow in COMSOL Multi-physics.
Thanks in advance!
I simulated a cylindrical TSV in Lumerical FDTD and measured reflectance with different radius. The reflectance curve getting more oscillation and peaks are shifting with change in radius. Is there any way to analyse the interference and diffraction effect?
I am trying to calibrate the full-cell OCV of the DFN physics-based model of the NMC532 cell. Even with multiple optimizations, the middle part of the curve doesn't calibrate with the experimental data. Can anyone suggest possible causes or solutions?
Attached is the comparison of exp. and simulated OCV curves obtained after optimization.
Hi researchers, I have simulated a cylindrical Dielectric Resonator Antenna (cDRA) to operate at frequencies of higher order modes. I need to calculate the quality factor for them to know if these modes are radiating mode or non-radiating mode. How can I do this theoretically or using CST or HFSS simulators?
Thanks in advance.
I'm trying to simulate VORTEX INDUCED VIBRATIONS in Flow Around A Rigid Cylinder. The diameter (D) and mass of the cylinder are 0.5 m and 35.78 g, respectively. The spring stiffness is 69.48 kN/m, the damping coefficient is 0.0039 Ns/m and Re=200. I've been trying various UDF since past 2 weeks but everytime m not able to simulate any oscillation so it would be of great help if you kindly provide the UDF.
Hello ResearchGate community,
I am currently working on antenna simulations and I am in need of guidance regarding the selection of an appropriate antenna simulation tool. My objective is to accurately simulate antenna behavior, obtain power patterns, and determine beam width, depth, and height.
I have previously attempted to use MATLAB's Phased Array System for antenna simulations, but I encountered unexpected results when simulating two antennas with a large spacing between them. Instead of observing two separate beams as expected, I only observed one beam. This raised questions about the accuracy and practicality of using MATLAB's Phased Array System for such scenarios.
Now, I am interested in exploring the use of non-array directive antennas, specifically the Gaussian antenna (spiral Archimedean), to enhance system performance and address challenges such as mutual coupling and sidelobe interference. I want to investigate whether utilizing non-array directive antennas can offer advantages over array-based systems, particularly in terms of system performance improvement, problem-solving capabilities, and the ability to track user movement.
To conduct a comprehensive analysis, I am seeking advice on the most suitable antenna simulation tool. I would like recommendations based on factors such as accuracy, ease of use, versatility, computational efficiency, and availability of advanced features. Additionally, if there are any open-source or freely available simulation tools that can provide comparable results to commercial software packages, I would greatly appreciate knowing about them.
Your insights and recommendations would be invaluable in guiding my research. Thank you in advance for your assistance!
I want to plot the induced voltage over the entire region (at a particular ht say z=50 mm) produced due to Tx coil directly using IE3D simulator?
I would like to know the best way for generating the crack automatically using XFEM through a relative paper or a tutorial video or any instructions, I would be so gratfuel.
This question delves into the fundamental nature of turbulence, a ubiquitous phenomenon in fluid dynamics that is characterized by chaotic and unpredictable fluid motion. Exploring the mechanisms behind turbulence and finding ways to better understand and predict its behavior is a challenging and active area of research with broad implications in various fields, including engineering, meteorology, and environmental sciences. This question opens up avenues for investigating turbulence models, turbulence control strategies, and the development of advanced computational techniques to simulate and analyze turbulent flows.
What is the underlying theory behind the integration of HARQ and soft combining in 5G systems? Additionally, when utilizing the NetSim simulator, where can I find the relevant HARQ log files for further analysis?
I want to simulate a grid-road topology (organized streets) with vehicles generate traffic to Road Side Unit (RSUs). Also, if I need to ramp up quickly to 100 or 200 vehicles how can I do that?
Hi, Could somebody please explain to me why lunar "soil" simulants JSC-1 and JSC-1A contain about 3% of ferric oxide while real lunar regolith do not have any ferric iron? Thank you, Igor Brown, PhD
I am trying to simulate an hypervelocity impact analysis between spherical projectile and composite fabric including fiber and matrix. (All of them are SPH)
Elastic plastic hydro material and eroding nodes to surface contact algorithm is used.
How can i tackle this error ?
*** Error 30061 (INI+61)
cannot find element of master segment 1343 of interface 1