Ramesh K. Agarwal

Ramesh K. Agarwal
Washington University in St. Louis | WUSTL , Wash U · Department of Mechanical Engineering and Materials Science

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334
Publications
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4,179
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Publications

Publications (334)
Article
Full-text available
In this study, the CO2 carbonatization potential of the Deccan basalt formation in Eastern India is evaluated by establishing a hydro-chemical field-scale model based on the geological, hydrological, and geochemical parameter of the basalt in the Mandla lobe. The reliable initial mineral thermodynamic parameters are obtained by validating the labor...
Article
This article briefs on an advanced observer-based proportional-type control scheme that stabilizes the attitude and regulates the position of two-wheeled mobile balancing robots. The robot parameter and load uncertainties are under consideration. There are two main differences from previous results: (a) the development of coordinate transformation...
Article
Full-text available
As a new “sink” of CO2 permanent storage, the depleted shale reservoir is very promising compared to the deep saline aquifer. To provide a greater understanding of the benefits of CO2 storage in a shale reservoir, a comparative study is conducted by establishing the full-mechanism model, including the hydrodynamic trapping, adsorption trapping, res...
Chapter
Shale is an important geological media for carbon capture utilization and storage. On one hand it can be regarded as impermeable caprock to prevent CO2 migration from reservoir, and on the other hand it can also treated as both natural gas and CO2 storage reservoir. CO2-shale reactions within caprock can interfere with the integrity of the rock int...
Article
This article is concerned with the problem of distributed model predictive control (DMPC) for second-order multiagent systems under event-triggered technique and logarithm quantized communication for a directed topological graph. Considering the limitation of communication bandwidth, a new bounded logarithm quantized communication strategy is propo...
Article
The energy conversion is proposed to analyze the effects of liquid properties on the formation of an ejecta sheet, prompt splashing, and crown evolution. The incompressible laminar Navier-Stokes equations coupled with the volume-of-fluid model are solved numerically in an axisymmetric frame to simulate the impact process. Based on the energy conver...
Article
Basalt formation is a new promising CO2 sink for providing secure long-term carbon storage via trapped CO2 in mineral phases. When water enters into the crystal structures of the divalent cation-bearing unaltered basalt, the rock is altered and serpentinized. The serpentinization of the unaltered basalt occurs widely around the world. To evaluate t...
Chapter
Shale is an important geological media for carbon capture utilization and storage. On one hand it can be regarded as impermeable caprock to prevent CO2 migration from reservoir, and on the other hand it can be also treated as natural gas and CO2 storage reservoir. CO2-shale reactions within caprock can interfere the rock integrity so as to bring th...
Technical Report
Full-text available
An important field of study in microfluidics is in the realm of blood rheology in microdevices. Many types of geometries have been developed for different lab-on-chip applications for sampling and analysis. The majority of experimental and numerical studies have revolved around straight blood vessel geometries, but in recent years there have been m...
Article
By using the finite volume method with volume of fluid model and global dynamic mesh technique, the effects of Froude number and geometry on the water entry process of a 2-D ellipse are investigated numerically. For the time history of the vertical force, the computational fluid dynamics (CFD) results match the experimental data much better than th...
Article
Circulating fluidized bed in chemical-looping combustion (CLC) is a recent technology that provides great advantage for gas–solid interaction and efficiency. In order to obtain a thorough understanding of this technology and to assess its effectiveness for industrial scale deployment, numerical simulations are conducted. Computational fluid dynamic...
Article
Purpose The purpose of this paper is to study the dynamic transmission of the oil film in soft start process of hydro-viscous drive (HVD) between the friction pairs with consideration of surface roughness, and obtain the distribution law of temperature, velocity, pressure, shear stress and viscous torque of the oil film. Design/methodology/approa...
Article
This paper describes a three-dimensional computational model of oil film between a friction pair to investigate the characteristics of both single-phase and two-phase flow of the oil film in hydro-viscous drive. For the single-phase oil film, the distribution of pressure is very regular from inlet to outlet of the friction pair; its value decreases...
Article
Aircraft water spray test on water-contaminated runway is of great significance in the civil aircraft airworthiness certification. In this paper, the differences in water spray between rolling elastic and rigid tires, and between the rolling and taxiing elastic tires, are studied. The smoothed particle hydrodynamics method is used for the numerical...
Conference Paper
Full-text available
This paper describes a new wall-distance-free (WDF) version of the recently developed Wary-Agarwal eddy-viscosity turbulence model (WA2017). The results from the new model are compared with experimental data for several standard benchmark test cases. Computational results for a flat plate flow, high Reynolds number channel flow, NASA wall-mounted h...
Chapter
Full-text available
Circulating fluidized bed (CFB) in chemical looping combustion (CLC) is a novel carbon capture technology which offers great advantage for high efficiency and low cost. To obtain a thorough understanding of the hydrodynamics behavior inside the reactors as well as CLC process, numerical simulations are conducted. Computational fluid dynamics (CFD)...
Article
Chemical-looping combustion (CLC) is a next generation combustion technology that shows great promise as a solution for the need of high-efficiency low-cost carbon capture from fossil fueled power plants. In this paper, numerical simulations are conducted of a binary particle bed associated with a coal-direct CLC system consisting of coal (represen...
Article
Background: Using viscosity of fluid between friction pairs to transmit power is called the Hydro-viscous Drive (HVD), which has obvious energy-saving effects on soft start and speed regulation in large belt conveyors, fans, and pumps. Therefore, it is of great practical significance to conduct the HVD technology research to improve its performance...
Article
CO2 enhanced shale gas recovery (CO2-ESGR) is a promising technology for addressing the global energy and environmental concerns by promoting the shale gas production and simultaneously reducing the CO2 emissions. To provide a greater understanding of the environmental benefits of CO2-ESGR, a three-dimensional numerical model corresponding to the t...
Chapter
There has been a strong emphasis on the development of safe and economical carbon capture, utilization, and storage (CCUS) technologies in recent years because of rising concerns about carbon dioxide (CO2) emissions from fossil fueled power plants. Two technologies that show promise for CCUS application are enhanced oil recovery (EOR) and enhanced...
Conference Paper
Full-text available
A one–equation variant of a k-epsilon turbulence model based on the mean turbulent time scale T = k/epsilon–equation is developed to account for the effects of low–Reynolds number (LRN) and wall proximity. The turbulent kinetic energy k is evaluated with an algebraically prescribed length scale having only one adjustable coefficient. The stress–int...
Chapter
The focus of this chapter is on the shape optimization of the Busemann-type biplane airfoil for drag reduction under both non-lifting and lifting conditions using genetic algorithms. The concept of biplane airfoil was first introduced by Adolf Busemann in 1935. Under design conditions at a specific supersonic flow speed, the Busemann biplane airfoi...
Article
Full-text available
Chemical-looping combustion (CLC) is a next generation combustion technology that has shown great promise in addressing the need for high-efficiency low-cost carbon capture from fossil fueled power plants to address rising carbon emissions. The spouted fluidized bed setup provides several advantages when solid coal is used as fuel for CLC. The Lagr...
Conference Paper
Full-text available
The looped airfoil wind turbine (LAWT™) is a patented new technology by EverLift Wind Tecnology, Inc. for generating power from wind. It takes advantage of the superior lift force of a linearly traveling wing compared to the rotating blades in conventional wind turbine configurations. Compared to horizontal and vertical axis wind turbines, the LAWT...
Conference Paper
Full-text available
Computational Fluid Dynamics (CFD) has become a routine tool in recent times for use in blood-contacting medical device design and analysis, such as prosthetic heart valves and ventricular assist devices (VADs). While CFD can aid in design by decreasing the need for expensive prototyping and iterative laboratory testing, standardizations are not cu...
Conference Paper
Arteriovenous fistula (AVF) is one type of vascular access which is a surgically created vein used to remove and return blood during hemodialysis [1]. It is a long-term treatment for kidney failure. Although clinical treatment and technology have both achieved great improvements in recent years, the vascular access for hemodialysis still has signif...
Conference Paper
Supersonic steam ejectors are widely used in many industrial applications, for example for refrigeration and desalination. The experimental evaluation of the flow field inside the ejector is relatively difficult and costly due to the occurrence of shock after the velocity of the steam reaches over the sonic level in the ejector. In this paper, nume...
Conference Paper
Forward Osmosis (FO) driven asymmetric membrane filtration is a developing technology which shows promise for seawater desalination and wastewater treatment. Due to the fact that asymmetric membranes are widely used in conjunction with this technology, internal concentration polarization (ICP), a flow-entrainment effect occurring within such membra...
Article
In this paper, the operations of fuzzy ellipsoid numbers and the direct relationship between the joint membership function and the edge membership functions are investigated. First, we prove that the general scalar multiplication (defined by Zadeh's expansion) of fuzzy ellipsoid numbers preserves the closeness of the operation, but the general addi...
Article
Full-text available
A simplified two-dimensional axisymmetric model was established based on a typical continental sedimentary basin in China to simulate the thermal evolution of wellbore and reservoir during the injection of CO2 by taking consideration of lithology heterogeneity of reservoir. By comparing with two simple one-dimensional theory models, the lithology h...
Article
Carbon dioxide geological sequestration simultaneously combined with water production from deep saline aquifer can effectively address the challenge faced by modern energy systems of reducing carbon dioxide emissions and water intensity while providing reliable, affordable, and secure energy. However, little attention has been paid to date in the l...
Article
Full-text available
The water-landing performance of a regional airplane with high wing and high tail is studied using the numerical simulation method. In the simulation, the Reynold-averaged Navier–Stokes equations with the realizable k-ϵ turbulence model are solved by the finite volume method. The volume-of-fluid method is used to capture the water–air interface, an...
Article
Full-text available
A simplified consistency formulation for Pk/ε (production to dissipation ratio) is devised to obtain a non-singular Cμ (coefficient of eddy-viscosity) in the explicit algebraic Reynolds stress model of Gatski and Speziale. The coefficient Cμ depends non-linearly on both rotational/irrotational strains and is used in the framework of an improved RAS...
Article
This paper is concerned with the L∞ performance analysis problem for time-varying delayed neural networks. First, a condition is proposed for the L∞ performance of single neural networks with time-varying delay and persistent bounded input based on the Wirtinger-type inequality together with the reciprocal convex approach. Then, sufficient conditio...
Article
Full-text available
Due to concerns about rising CO2 emissions from fossil fuel power plants, there is strong emphasis on the development of an economical method for Carbon Capture Utilization and Storage (CCUS). One area of current interest in CO2 utilization is the Enhanced Oil Recovery (EOR) from depleted reservoirs. The efficiency of the oil extraction is highly d...
Conference Paper
Full-text available
An approach to reducing the two-equation $k$-$\epsilon$ model to a one-equation model based on the $k$--equation is proposed to account for the distinct effects of low--Reynolds number (LRN) and wall proximity. The dissipation rate $\epsilon$ is evaluated with an algebraically prescribed length scale having only one adjustable coefficient. The...
Article
Carbon sequestration with enhanced gas recovery (CS-EGR) is a well-known technology for safe and economical Carbon Capture, Utilization and Storage (CCUS). However, there is lack of a robust and comprehensive approach to study the optimization of the CS-EGR process. In this paper, a multi-objective optimization code based on a genetic algorithm is...
Article
Chemical-looping combustion (CLC) is a next generation combustion technology that shows great promise in addressing the need for high-efficiency low-cost carbon capture from fossil fueled power plants. Although there have been a multitude of experimental studies on CLC in recent years, the number of CFD simulations in the literature has been more l...
Article
The problem of event-triggered H∞ filtering for networked Markovian jump system is studied in this paper. A dynamic discrete event-triggered scheme is designed to choose the transmitted data for different Markovian jumping modes. The time-delay modelling method is employed to describe the event-triggered scheme and the network-related behaviour, su...