Suhas S. JainGeorgia Institute of Technology | GT · School of Mechanical Engineering
Suhas S. Jain
Doctor of Philosophy
About
66
Publications
27,297
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Introduction
Suhas is an assistant professor at Georgia Tech. His research group— Flow Physics and Computational Science (FPCS) Lab— specializes in computational modeling and simulations of fluid flows with a focus on (but not limited to) multiphase flows, turbulent flows, fluid-structure interaction, numerical modeling, A.I., and high performance computing. Applications include energy, propulsion, aerospace design, and advancing our understanding of climate change.
Additional affiliations
Education
August 2018 - January 2022
September 2016 - July 2018
July 2010 - May 2014
Publications
Publications (66)
Breakup of liquid drops occurs in several natural and industrial settings. Fully resolved Volume of Fluid based simulations presented in this study reveal the complete flow physics and droplet dynamics that lead to the breakup of a drop in a particular mode. We have investigated the effects of density ratio and Reynolds number on the dynamics of dr...
Soft solids in fluids find wide range of applications in science and engineering, especially in the study of biological tissues and membranes. In this study, an Eulerian finite volume approach has been developed to simulate fully resolved incompressible hyperelastic solids immersed in a fluid. We have adopted the recently developed reference-map te...
In this article, we propose a novel conservative diffuse-interface method for the simulation of immiscible compressible two-phase flows. The proposed method discretely conserves the mass of each phase, momentum and total energy of the system. We use the baseline five-equation model and propose interface-regularization (diffusion–sharpening) terms i...
We simulate the flow of two immiscible and incompressible fluids separated by an interface in a homogeneous turbulent shear flow at a shear Reynolds number equal to $15\,200$ . The viscosity and density of the two fluids are equal, and various surface tensions and initial droplet diameters are considered in the present study. We show that the two-p...
Cluster and void formations are key processes in the dynamics of particle-laden turbulence. In this work, we assess the performance of various neural network models for synthesizing preferential concentration fields of particles in turbulence. A database of direct numerical simulations of homogeneous isotropic two-dimensional turbulence with one-wa...
In this work, a localized artificial-viscosity/diffusivity method is proposed for accurately capturing discontinuities in compressible flows. There have been numerous efforts to improve the artificial diffusivity formulation in the last two decades, through appropriate localization of the artificial bulk viscosity for capturing shocks. However, for...
In this study, five ice shapes generated at NASA Glenn's Icing Research Tunnel (IRT) are simulated at multiple angles of attack [1]. These geometries target different icing environments , both early-time and longer-duration glaze and rime ice exposure events, including a geometry that results from using a thermal ice-protection system. Using the la...
A model for transport of soluble surfactants in two-phase flows
Forced simulations of two-phase turbulent flows at various Weber numbers, density ratios, and void fractions.
Clustering dynamics of inertial particles in turbulent channel flow are studied via tessellation-based analysis of high-fidelity simulation data at $Re_\tau \ approx 230$ with various values of mass loading (10% - 100%) and the Stokes number ($St^+ = [1 - 60]$). We then characterise the solenoidal, rotational, and swirling motions of clusters by co...
In this study, we employ wall-modeled large-eddy simulations (WMLES) to analyze the aerodynamic performance of an 8.9%-scaled semi-span swept wing model based on the NASA Common Research Model (CRM). The simulations consider two ice shapes: (1) a real-ice shape obtained from laser-scanning accreted ice in the NASA Icing Research Tunnel (IRT), and (...
In this work, we propose a novel scalar-transport model for the simulation of scalar quantities that are confined to the interface in two-phase flows. In a two-phase flow, the scalar quantities, such as salts and surfactants, can reside at the interface (due to their molecular structure, electrostatic interactions, and solubility) and can modify th...
In this work, a localized artificial-viscosity/diffusivity method is proposed for accurately capturing discontinuities in compressible flows. There have been numerous efforts to improve the artificial diffusivity formulation in the last two decades, through appropriate localization of the artificial bulk viscosity for capturing shocks. However, for...
div class="section abstract"> Predicting the aerodynamic performance of an aircraft in icing conditions is critical as failures in an aircraft’s ice protection system can compromise flight safety. Aerodynamic effects of icing have typically relied on RANS modeling, which usually struggles to predict stall behavior, including those induced by surfac...
div class="section abstract"> In this work, ice accretion is investigated on a fundamental level using a novel Eulerian phase field approach that captures the phase interface. This method, unlike the Allen-Cahn method, does not lead to spurious phase change (artificial mass loss). This method is also straightforward to implement and avoids normal v...
div class="section abstract"> Modeling of icing is important for the design of aircraft lifting surfaces and for the design of efficient propulsion systems. The computational modeling of ice accretion prediction is important to replace the expensive experimental techniques for calculating the ice shapes in Icing tunnels, and the first step toward m...
The predictive capability of two way–coupled point-particle Euler-Lagrange model in accurately capturing particle-flow interactions under grid refinement, wherein the particle size can be comparable to the grid size, is systematically evaluated. Two situations are considered, (i) uniform flow over a stationary particle, and (ii) decaying isotropic...
Interfacial Rayleigh–Taylor mixing is crucial to describing important natural and engineering processes, such as exploding supernovae, laser micromachining, hot spots in inertial confinement fusion, and optical telecommunications. These require the characterization of the time dependence of the driving acceleration. We compare our theoretical formu...
The predictive capability of two way--coupled point-particle Euler-Lagrange model in accurately capturing particle-flow interactions under grid refinement, wherein the particle size can be comparable to the grid size, is systematically evaluated. Two situations are considered, (i) uniform flow over a stationary particle, and (ii) decaying isotropic...
Predicting the aerodynamic performance of an aircraft in icing conditions is critical as failures in an aircraft’s ice protection system can compromise flight safety. Aerodynamic effects of icing have typically relied on RANS modeling, which usually struggles to predict stall behavior, including those induced by surface roughness. Encouraged by rec...
Large-amplitude current-driven instabilities in hollow cathode plumes can generate energetic ions responsible for cathode sputtering and spacecraft degradation. A 2D2V (two dimensions each in configuration [D] and velocity [V] spaces) grid-based Vlasov--Poisson (direct kinetic) solver is used to study their growth and saturation, which comprises fo...
In this work, we propose a novel phase-field model for the simulation of two-phase flows that is accurate, conservative, bounded, and robust. The proposed model conserves the mass of each of the phases, and results in bounded transport of the volume fraction. We present results from the canonical test cases of a drop advection and a drop in a shear...
Two-phase flows that involve heat/mass transfer are widespread in industrial and environmental applications such as chemical reactors, bubbly flows, combustion, boiling, carbon sequestration, and ocean-atmosphere exchanges. It is therefore important to accurately predict the rate of heat/mass transfer across capillary interfaces via numerical simul...
Accurate numerical modeling of compressible flows, particularly in the turbulent regime, requires a method that is non-dissipative and stable at high Reynolds (Re) numbers. For a compressible flow, it is known that discrete conservation of kinetic energy is not a sufficient condition for numerical stability, unlike in incompressible flows.
In this...
In this work, we propose a novel phase-field model for the simulation of two-phase flows that is accurate, conservative, bounded, and robust. The proposed model conserves the mass of each of the phases, and results in bounded transport of the volume fraction. We present results from the canonical test cases of a drop advection and a drop in a shear...
Two-phase flows are ubiquitous in nature and have applications in engineering and natural processes such as atomization of jets and sprays, breaking waves, emulsions, boiling phenomena, carbon sequestration, and bubbly flows in cooling towers of nuclear power plants. Numerous challenges are associated with the numerical modeling of two-phase flows,...
Simulations of high-Mach-number compressible flows, and for high Reynolds numbers, require an accurate and stable discontinuity-capturing method. In this work, we propose a novel, entropy-consistent, and stable localized artificial-viscosity/diffusivity (LAD)-based method for capturing shock and contact discontinuities in compressible flows. Using...
Rarefied gas flows are encountered in low-pressure environments such as in high-flying aircraft, re-entry of space vehicles, and dynamics of Earth satellites, and also at standard pressure conditions in microfluidics and microelectromechanical systems. The classical continuum methods break down for rarefied gas flows and non- equilibrium effects ne...
This work describes three diffuse-interface methods for the simulation of immiscible, compressible multiphase fluid flows and elastic-plastic deformation in solids. The first method is the localized-artificial-diffusivity approach of Cook (2007), Subramaniam et al., (2018), and Adler and Lele (2019), in which artificial diffusion terms are added to...
Three-dimensional Rayleigh–Taylor instability (RTI) with the time-varying acceleration in a finite domain is investigated in a systematic framework. The acceleration magnitude follows a power law in time with an exponent greater than −2. Applying the group theory, the instabilities are demonstrated considering the irreducible representations for ob...
Center for Turbulence Annual Research Briefs, Stanford University
This technical report proposes a kinetic energy–and entropy-preserving (KEEP) scheme for compressible two-phase turbulent flows. The proposed scheme is robust and stable for high-Reynolds number turbulent flows.
A comparison and assessment of diffuse-interface methods for the simulation of compressible multiphase fluid flows and multiphase elastic-plastic deformation of solid materials with strength. (This is part 1 of the 2-part series)
A comparison and assessment of diffuse-interface methods for the simulation of compressible multiphase fluid flows and multiphase elastic-plastic deformation of solid materials with strength. (This is part 2 of the 2-part series)
In this article, we propose a novel scalar-transport model for the simulation of scalar quantities in two-phase flows with a phase-field method (diffuse-interface method). In a two-phase flow, the scalar quantities typically have disparate properties in two phases, which results in effective confinement of the scalar quantities in one of the phases...
Breakup of a liquid jet in a high speed gaseous crossflow finds wide range of engineering and technological applications, especially in the combustors of the gas turbine engines in aerospace industry.In this study, we present volume-of-fluid method based direct numerical simulations of a liquid jet injected into a swirling crossflow of gas. The liq...
Modeling passive and active scalars in two-phase flows
Some thoughts on the development of quantum algorithms for the simulation of Navier-Stokes equations along with an overview on the current state-of-the art methods.
In this article, we propose a novel conservative diffuse-interface method for the simulation of compressible two-phase flows. The proposed method discretely conserves the mass of each phase, momentum and total energy of the system. We use the baseline five-equation model and propose interface-regularization (diffusion-sharpening) terms in such a wa...
This paper is associated with a video winner of a 2018 APS/DFD Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2018.GFM.V0027
Breakup of a liquid jet in a high speed gaseous crossflow finds wide range of engineering and technological applications, especially in the combustors of the gas turbine engines in aerospace industry. In this study, we present volume-of-fluid method based direct numerical simulations of a liquid jet injected into a swirling crossflow of gas. The li...
Soft solids in fluids find wide range of applications in science and engineering, especially in the study of biological tissues and membranes. In this study, an Eulerian finite volume approach has been developed to simulate fully resolved incompressible hyperelastic solids immersed in a fluid. We have adopted the recently developed reference map te...
We simulate the flow of two immiscible and incompressible fluids separated by an interface in a homogeneous turbulent shear flow at a shear Reynolds number equal to 15200. The viscosity and density of the two fluids are equal, and various surface tensions and initial droplet diameters are considered in the present study. We show that the two-phase...
Prediction of bubble dynamics in turbulent seawater is of practical importance for the engineering analysis of naval systems. In ships, the air bubbles entrained by boundary layers and stern waves form an elongated wake that lasts for several kilometers downstream (Trevorrow et al. 1994; Fu et al. 2007; Stanic et al. 2009). Though the bubbles are t...
Soft solids in fluids find wide applications in science, especially in the study of biological tissues and membranes. In this study an incompressible 2D Eulerian Finite volume solver has been developed on a fully collocated grid. We have adopted the Reference Map Technique by Valkov et. al (J. Appl. Mech., 82, 2015) as an approach to fully resolve...
Breakup of drop/bubble can be viewed as a result of fundamental force balance when the disruptive force is greater than the restorative force. A disruptive force acting on the drop/bubble tries to deform it, whereas a restorative force refrains it from deforming. Studying breakup and coalescence phenomenon is utmost important since it governs the a...
Questions
Question (1)
Using cuSparse library for Tridiagonal solver on a CUDA compatible GPU with compute capability 1.1, has decreased the performance drastically, up to 50 times slower when compared with a traditional serial solver on a Core 2 Duo CPU.
Is it because of the low compute compatibility or is my implementation wrong?