Ishan Srivastava
Research Scientist, Applied Mathematics and Computational Research Division
Ishan Srivastava is a Research Scientist in the
Applied Mathematics Department within the Computing Sciences Area at Lawrence Berkeley National Laboratory, and affiliated with the Center for Computational
Sciences and Engineering (CCSE).
His research aims to apply theory and simulation to understand the structure and dynamics of multiphase flows and complex fluids. A particular area of interest is the physics of granular materials and nonNewtonian fluid mixtures, which are of enormous technological and natural importance. His research uses a variety of computational methods such as molecular dynamics, discrete element method, and continuum fluid and solid modeling, along with datadriven methods for multiscale coupling. Such a multiscale approach to simulate these materials allows the identification of particle scale processes that govern macroscale material behavior. The overarching goal is to develop novel computational methods in particlescale modeling to predict microstructureaware constitutive relationships that eventually inform the continuum modeling of multiphase flows and complex fluids. Some motivating applications for his research include advanced manufacturing, bioreactor efficiency optimization, and various DOE mission areas involving energy and environment.
In another research thrust, he has been involved in the development of a new numerical formulation for the solution of nonisothermal, compressible NavierStokes equations with thermal fluctuations to describe mesoscale transport phenomena in multispecies fluid mixtures. Such a fluctuating hydrodynamics based continuum approach has been demonstrated to accurately capture nonequilibrium hydrodynamic fluctuations, and simulate thermal fluctuations driven hydrodynamic instabilities (such as RayleighTaylor). He is currently developing hybrid multiscale methods to couple DSMC and compressible fluctuating hydrodynamics for highfidelity simulations of gas separation across nanoporous membranes and surface catalysis. He is also using these methods to explore the fundamental role of thermal fluctuations in compressible turbulence and turbulent mixing.
Background
Ishan received his PhD in Mechanical Engineering from Purdue University in the summer of 2017 under the supervision of Prof. Tim Fisher, where he investigated the mechanics, rheology and transport in granular materials consisting of nonspherical particles (here is a link to the dissertation). After graduate studies, he conducted postdoctoral research with Gary Grest at Sandia National Laboratories, where he developed constitutive models of dense granular flows and highpressure deformation of polymer nanocomposites using molecular dynamics and discrete element methods. Subsequently, he was a postdoctoral scholar with John Bell at Lawrence Berkeley National Laboratory, where he developed continuum fluctuating hydrodynamics models to investigate fluid dynamics at the mesoscale, such as in electrolytes and fluid mixtures at the nanoscale, with various applications in catalysis, separation technologies and carbon capture.
PeerReviewed Publications
 J. M. Monti, I. Srivastava, L. E. Silbert, J. B. Lechman, G. S. Grest,
Fractal Dimensions of Jammed Packings with PowerLaw Particle Size Distributions in Two and Three Dimensions,
accepted for publication, Physical Review E, 2023.
[arxiv]
 J. G. Wang, D. R. Ladiges, I. Srivastava, S. P. Carney, A. J. Nonaka, A. L. Garcia, J. B. Bell,
Steric Effects in InducedCharge ElectroOsmosis for Strong Electric Fields,
Physical Review Fluids, 8, 083702, 2023.
[doi]
 I. Srivastava, D. R. Ladiges, A. Nonaka, A. L. Garcia, J. B. Bell,
Staggered Scheme for the Compressible Fluctuating Hydrodynamics of Multispecies Fluid Mixtures,
Physical Review E, 107, 015305, 2023.
[doi]
 J. M. Monti, J. T. Clemmer, I. Srivastava, L. E. Silbert, G. S. Grest, J. B. Lechman,
LargeScale Frictionless Jamming with PowerLaw Particle Size Distributions,
Physical Review E, 106, 034901, 2022.
[doi]
 D. R. Ladiges, J. G. Wang, I. Srivastava, S. P. Carney, A. Nonaka, A. L. Garcia, A. Donev and J. B. Bell,
Modeling Electrokinetic Flows with the Discrete Ion Stochastic Continuum Overdamped Solvent Algorithm,
Physical Review E, 106, 035104, 2022.
[doi]
 A. P. Santos, I. Srivastava, L. E. Silbert, J. B. Lechman and G. S. Grest,
Fluctuations and PowerLaw Scaling of Dry, Frictionless Granular Rheology Near the HardParticle Limit,
Physical Review Fluids, 7, 084303, 2022.
[doi]
 I. Srivastava, L. E. Silbert, J. B. Lechman and G. S. Grest,
Flow and Arrest in Stressed Granular Materials,
Soft Matter, 18, 735, 2022
[doi]
 W. D. Fullmer, R. Porcu, J. Musser, A. S. Almgren, I. Srivastava,
The Divergence of Nearby Trajectories in SoftSphere DEM
Particuology, 63, 1, 2022.
[doi]
 J. T. Clemmer, I. Srivastava, G. S. Grest, J. B. Lechman,
Shear is Not Always Simple: RateDependent Effects of Loading Geometry on Granular Rheology,
Physical Review Letters, 127, 268003, 2021
[doi]
 I. Srivastava, S. A. Roberts, J. T. Clemmer, L. E. Silbert, J. B. Lechman, G. S. Grest,
Jamming of Bidisperse Frictional Spheres,
Physical Review Research, 3(3), L032042, 2021.
[doi]
 I. Srivastava, L. E. Silbert, G. S. Grest and J. B. Lechman,
Viscometric Flow of Dense Granular Materials under Controlled Pressure and Shear Stress,
Journal of Fluid Mechanics, 907(A18), 1, 2021
[doi]
 A. P. Santos, D. S. Bolintineanu, G. S. Grest, J. B. Lechman, S. J. Plimpton, I. Srivastava, and L. E. Silbert,
Granular Packings with Sliding, Rolling and Twisting Friction,
Physical Review E, 102, 032903, 2020
[doi]
 I. Srivastava, D. S. Bolintineanu, J. B. Lechman and S. A. Roberts,
Controlling Binder Adhesion to Impact Electrode Mesostructure and Transport,
ACS Applied Materials and Interfaces, 12, 34919, 2020.
[doi]
 I. Srivastava, J. B. Lechman, G. S. Grest and L. E. Silbert,
Evolution of Internal Granular Structure at the FlowArrest Transition,
Granular Matter, 22(2), 18, 2020.
[doi]
 J. M. D. Lane, A. P. Thompson, I. Srivastava, G. S. Grest, T. Ao, B. Stoltzfus, K. Austin, H. Fan, D. Morgan, M. D. Knudson,
Scale and Rate in CdS PressureInduced Phase Transition,
AIP Conference Proceedings (Shock Compression of Condensed Matter 2019), 2272(1), 100016, 2020.
[doi]
 I. Srivastava, L. E. Silbert, G. S. Grest and J. B. Lechman,
FlowArrest Transitions in Frictional Granular Matter,
Physical Review Letters, 122(4), 048003, 2019.
[doi]
 I. Srivastava, B. L. Peters, J. M. D. Lane, H. Fan, K. M. Salerno and G. S. Grest,
Mechanics of Gold Nanoparticle Superlattices at High Hydrostatic Pressures,
The Journal of Physical Chemistry C, 123(28), 17530, 2019.
[doi]
 K. M. Salerno, D. S. Bolintineanu, G. S. Grest, J. B. Lechman, S. J. Plimpton, I. Srivastava and L. E. Silbert,
Effect of Shape and Friction on the Packing and Flow of Granular Materials,
Physical Review E, 98(5), 050901, 2018.
[doi]
 J. M. D. Lane, K. M. Salerno, I. Srivastava, G. S. Grest and H. Fan,
Modeling PressureDriven Assembly of Polymer Coated Nanoparticles,
AIP Conference Proceedings (Shock Compression of Condensed Matter 2017), 1979(1), 090007, 2018.
[doi]
 I. Srivastava and T. S. Fisher,
Slow Creep in Soft Granular Packings,
Soft Matter, 13(18), 3411, 2017.
[doi]
 L. Y. Leung, C. Mao, I. Srivastava, P. Du and C. Y. Yang,
Flow Function of Pharmaceutical Powders Is Predominantly Governed by Cohesion, Not by Friction Coefficients,
Journal of Pharmaceutical Sciences, 106(7), 1865, 2017.
[doi]
 R. Kantharaj, I. Srivastava, K. R. Thaker, A. U. Gaitonde, A. Bruce, J. Howarter, T. S. Fisher, A. M. Marconnet,
Thermal Conduction in Graphite FlakeEpoxy Composites using Infrared Microscopy,
Proceedings of the 16th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, 17, 2017.
[doi]
 K. C. Smith, I. Srivastava, T. S. Fisher and M. Alam,
VariableCell Method for StressControlled Jamming of Athermal, Frictionless Grains,
Physical Review E, 89(4), 042203, 2014.
[doi]
 I. Srivastava, S. Sadasivam, K. C. Smith and T. S. Fisher,
Combined Microstructure and Heat Conduction Modeling of Heterogeneous Interfaces and Materials,
Journal of Heat Transfer, 135(6), 061603, 2013.
[doi]
 I. Srivastava, K. C. Smith and T. S. Fisher,
ShearInduced Failure in Jammed Nanoparticle Assemblies,
AIP Conference Proceedings (Powders and Grains 2013), 1542(1), 86, 2013.
[doi]
