Satyvir Singh
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View article: Extraction of Moment Closures for Strongly Non-Equilibrium Flows via Machine Learning
Extraction of Moment Closures for Strongly Non-Equilibrium Flows via Machine Learning Open
We introduce a machine learning framework for moment-equation modeling of rarefied gas flows, addressing strongly non-equilibrium conditions inaccessible to conventional computational fluid dynamics. Our approach utilizes high-order moment…
View article: Shock Mach Number Effect on Instability Evolution at a Light–Heavy Fluid Interface: A Numerical Investigation
Shock Mach Number Effect on Instability Evolution at a Light–Heavy Fluid Interface: A Numerical Investigation Open
Shock–accelerated interfaces between fluids of different densities are prone to Richtmyer–Meshkov-type instabilities, whose evolution is strongly influenced by the incident shock Mach number. In this study, we present a systematic numerica…
View article: A finite element solver for a thermodynamically consistent electrolyte model
A finite element solver for a thermodynamically consistent electrolyte model Open
View article: Layer Thickness Impact on Shock-Accelerated Interfacial Instabilities in Single-Mode Stratifications
Layer Thickness Impact on Shock-Accelerated Interfacial Instabilities in Single-Mode Stratifications Open
This study investigates the influence of heavy-layer thickness on shock-accelerated interfacial instabilities in single-mode stratifications using high-order discontinuous Galerkin simulations at a fixed shock Mach number (Ms=1.22). By sys…
View article: Numerical Investigation of Atwood Number Effects on Shock-Driven Single-Mode Stratified Heavy Fluid Layers
Numerical Investigation of Atwood Number Effects on Shock-Driven Single-Mode Stratified Heavy Fluid Layers Open
This work presents a numerical investigation of Richtmyer–Meshkov instability (RMI) in shock-driven single-mode stratified heavy fluid layers, with emphasis on the influence of the Atwood number. High-order modal discontinuous Galerkin sim…
View article: Single-Mode Richtmyer–Meshkov Instability in Light Fluid Layer: Insights from Numerical Simulations
Single-Mode Richtmyer–Meshkov Instability in Light Fluid Layer: Insights from Numerical Simulations Open
This study presents high-fidelity numerical simulations of the shock-accelerated single-mode Richtmyer–Meshkov instability (RMI) in a light helium layer confined between two interfaces and surrounded by nitrogen gas. A high-order modal dis…
View article: Numerical investigation of Richtmyer–Meshkov instability in shock-driven light square bubble via magnetohydrodynamics
Numerical investigation of Richtmyer–Meshkov instability in shock-driven light square bubble via magnetohydrodynamics Open
View article: Insights into coupling effects of double light square bubbles on shocked hydrodynamic instability
Insights into coupling effects of double light square bubbles on shocked hydrodynamic instability Open
View article: Numerical Simulations of Shock-driven Heavy Fluid Layer
Numerical Simulations of Shock-driven Heavy Fluid Layer Open
The present study presents the numerical simulations for a shocked-heavy fluid layer with a stratified N2/SF6/N2 configuration. Simulations were conducted using a third-order modal discontinuous Galerkin method to solve the compressible tw…
View article: A Finite Element Solver for a Thermodynamically Consistent Electrolyte Model
A Finite Element Solver for a Thermodynamically Consistent Electrolyte Model Open
View article: Computational Study on Flow Characteristics of Shocked Light Backward-Triangular Bubbles in Polyatomic Gas
Computational Study on Flow Characteristics of Shocked Light Backward-Triangular Bubbles in Polyatomic Gas Open
This study computationally examined the Richtmyer–Meshkov instability (RMI) evolution in a helium backward-triangular bubble immersed in monatomic argon, diatomic nitrogen, and polyatomic methane under planar shock wave interactions. Using…
View article: Computational Study of Shocked V-Shaped N2/SF6 Interface across Varying Mach Numbers
Computational Study of Shocked V-Shaped N2/SF6 Interface across Varying Mach Numbers Open
The Mach number effect on the Richtmyer–Meshkov instability (RMI) evolution of the shocked V-shaped N2/SF6 interface is numerically studied in this research. Four distinct Mach numbers are taken into consideration for this purpose: Ms=1.12…
View article: Numerical Study of Shock Wave Interaction with V-Shaped Heavy/Light Interface
Numerical Study of Shock Wave Interaction with V-Shaped Heavy/Light Interface Open
This paper investigates numerically the shock wave interaction with a V-shaped heavy/light interface. For numerical simulations, we choose six distinct vertex angles (θ=40∘,60∘,90∘,120∘,150∘, and 170∘), five distinct shock wave strengths (…
View article: On the evolution of magnetohydrodynamic flow instability in shock-accelerated light bubble
On the evolution of magnetohydrodynamic flow instability in shock-accelerated light bubble Open
The study investigates the evolution of flow instabilities in a magnetohydrodynamic (MHD) environment involving a shock-accelerated light cylindrical bubble. Numerical simulations were conducted using a cylindrical helium (He) bubble accel…
View article: Finite Element Simulation of Modified Poisson-Nernst-Planck/Navier-Stokes Model for Compressible Electrolytes under Mechanical Equilibrium
Finite Element Simulation of Modified Poisson-Nernst-Planck/Navier-Stokes Model for Compressible Electrolytes under Mechanical Equilibrium Open
This work presents a finite element method for a modified Poisson-Nernst-Planck/Navier-Stokes (PNP/NS) model under the mechanical equilibrium, developed for compressible electrolytes. The modification is based on the new model proposed by …
View article: High-fidelity simulations of Richtmyer–Meshkov flows triggered by a forward-pentagonal bubble with different Atwood numbers
High-fidelity simulations of Richtmyer–Meshkov flows triggered by a forward-pentagonal bubble with different Atwood numbers Open
In fluid dynamics, the Atwood number is a dimensionless parameter that quantifies the density difference between two fluids. It is calculated as At=(ρ1−ρ2)/(ρ1+ρ2), where ρ1 and ρ2 represent the densities of the respective fluids. This res…
View article: Modal Discontinuous Galerkin Simulations of Richtmyer–Meshkov Instability at Backward-Triangular Bubbles: Insights and Analysis
Modal Discontinuous Galerkin Simulations of Richtmyer–Meshkov Instability at Backward-Triangular Bubbles: Insights and Analysis Open
This paper investigates the dynamics of Richtmyer–Meshkov instability (RMI) in shocked backward-triangular bubbles through numerical simulations. Two distinct gases, He and SF6, are used within the backward-triangular bubble, surrounded by…
View article: Exploring the Atwood number impact on shock-driven hydrodynamic instability at pentagonal interface using discontinuous Galerkin simulations
Exploring the Atwood number impact on shock-driven hydrodynamic instability at pentagonal interface using discontinuous Galerkin simulations Open
Investigation of Atwood number impact is crucial for comprehending the flow dynamics of the evolving hydrodynamic instability. In this paper, the Atwood number impacts on the shock-driven hydrodynamic instability at a backward-facing penta…
View article: Analyzing Richtmyer–Meshkov Phenomena Triggered by Forward-Triangular Light Gas Bubbles: A Numerical Perspective
Analyzing Richtmyer–Meshkov Phenomena Triggered by Forward-Triangular Light Gas Bubbles: A Numerical Perspective Open
In this paper, we present a numerical investigation into elucidating the complex dynamics of Richtmyer–Meshkov (RM) phenomena initiated by the interaction of shock waves with forward-triangular light gas bubbles. The triangular bubble is f…
View article: Unfolding of shocked hydrodynamic instability at SF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg" display="inline" id="d1e1078"><mml:msub><mml:mrow/><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:math> elliptical interface: Physical insights from numerical simulations
Unfolding of shocked hydrodynamic instability at SF elliptical interface: Physical insights from numerical simulations Open
The Richtmyer–Meshkov (RM) instability widely exists in variety of industrial and scientific applications, such as in inertial confinement fusion, astrophysics explosions, supersonic combustion, bubble dynamics and cavitation. This study i…
View article: Modal Discontinuous Galerkin Simulations for Grad’s 13 Moment Equations: Application to Riemann Problem in Continuum-Rarefied Flow Regime
Modal Discontinuous Galerkin Simulations for Grad’s 13 Moment Equations: Application to Riemann Problem in Continuum-Rarefied Flow Regime Open
For real-world engineering applications, there is a great deal of interest in developing effective models and simulations of continuum-rarefied gas flows. In this study, the numerical simulations of Grad's 13 (G13) moment equations with ap…
View article: Analysis of Thermal Mixing and Entropy Generation during Natural Convection Flows in Arbitrary Eccentric Annulus
Analysis of Thermal Mixing and Entropy Generation during Natural Convection Flows in Arbitrary Eccentric Annulus Open
The present study presents a computational investigation into the thermal mixing along with entropy generation throughout the natural convection flow within an arbitrarily eccentric annulus. Salt water is filled inside the eccentric annulu…
View article: Insight on the Flow Physics of Shock-driven Elliptical Gas Inhomogeneity with Different Atwood Numbers
Insight on the Flow Physics of Shock-driven Elliptical Gas Inhomogeneity with Different Atwood Numbers Open
This article investigates the effects of Atwood numbers on the flow physics of shock-driven elliptical gas inhomogeneity based on numerical simulations. We examine five different gases—He, Ne, Ar, Kr, and SF6—that are filled inside an elli…
View article: Numerical simulations of rarefied gas flow over an aero-spiked hypersonic blunt body using the second-order Boltzmann-Curtiss constitutive model
Numerical simulations of rarefied gas flow over an aero-spiked hypersonic blunt body using the second-order Boltzmann-Curtiss constitutive model Open
Hypersonic vehicles experience significant aerodynamic drag and aerothermal heating while traveling through the atmosphere. One technique involves reducing these aero-thermodynamic loads by adding an aerodynamic tip to the blunt nose of th…
View article: On the Spatiotemporal Pattern Formation in Nonlinear Coupled Reaction–Diffusion Systems
On the Spatiotemporal Pattern Formation in Nonlinear Coupled Reaction–Diffusion Systems Open
Nonlinear coupled reaction–diffusion (NCRD) systems have played a crucial role in the emergence of spatiotemporal patterns across various scientific and engineering domains. The NCRD systems considered in this study encompass various model…
View article: Spatiotemporal pattern formation in nonlinear coupled reaction-diffusion systems with a mixed-type modal discontinuous Galerkin approach
Spatiotemporal pattern formation in nonlinear coupled reaction-diffusion systems with a mixed-type modal discontinuous Galerkin approach Open
The nonlinear coupled reaction-diffusion (NCRD) systems are important in the formation of spatiotemporal patterns in many scientific and engineering fields, including physical and chemical processes, biology, electrochemical processes, fra…
View article: Numerical simulations of Richtmyer–Meshkov instability of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e1431" altimg="si189.svg"><mml:msub><mml:mrow><mml:mtext>SF</mml:mtext></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:math> square bubble in diatomic and polyatomic gases
Numerical simulations of Richtmyer–Meshkov instability of square bubble in diatomic and polyatomic gases Open
View article: A three-dimensional modal discontinuous Galerkin method for the second-order Boltzmann-Curtiss-based constitutive model of rarefied and microscale gas flows
A three-dimensional modal discontinuous Galerkin method for the second-order Boltzmann-Curtiss-based constitutive model of rarefied and microscale gas flows Open
View article: A mixed-type modal discontinuous Galerkin approach for solving nonlinear reaction diffusion equations
A mixed-type modal discontinuous Galerkin approach for solving nonlinear reaction diffusion equations Open
In this study, a mixed-type modal discontinuous Galerkin (DG) algorithm is utilized to simulate the nonlinear reaction-diffusion (RD) equations which describe miscellaneous physical phenomena involving in chemical processes, nuclear reacti…
View article: Contribution of Mach number to the evolution of the Richtmyer-Meshkov instability induced by a shock-accelerated square light bubble
Contribution of Mach number to the evolution of the Richtmyer-Meshkov instability induced by a shock-accelerated square light bubble Open
The Richtmyer-Meshkov (RM) instability has long been an interesting subject due to its fundamental significance in scientific research, as well as its crucial role in engineering applications. In this study, the contribution of shock Mach …