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Ishan Srivastava

Ishan Srivastava
Postdoctoral Scholar

Affiliation and Research Interests

I am a postdoctoral researcher in the Center for Computational Sciences and Engineering (CCSE) in the Computing Sciences Directorate at the Lawrence Berkeley National Laboratory.

My current research interests lie at the intersection of soft matter, statistical mechanics and continuum mechanics (solid and fluid mechanics). I am particularly interested in developing theory and numerical methods towards predicting the structure and dynamics of complex fluids, soft materials and granular materials, especially in far-from-equilibrium conditions.

In the Multiscale Modeling and Stochastic Systems (MuMSS) group at CCSE, I am currently developing numerical simulations of stochastic systems that describe complex fluids (such as electrolytes) at the mesoscale.

Previously, I worked as a postdoctoral appointee at the Center for Integrated Nanotechnologies in Sandia National Laboratories, where I conducted theoretical and numerical investigations of phase transitions in soft and granular materials with Gary Grest, and also developed and conducted large-scale simulations of mesostructure and electrochemical transport in lithium-ion battery electrodes with Scott Roberts.

I received my PhD in Mechanical Engineering from Purdue University in the summer of 2017, where I was advised by Prof. Tim Fisher. As a part of graduate research, I studied mechanics, rheology and transport in granular materials through numerical simulations.

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Journal Articles

W. D. Fullmer, R. Porcu, J. Musser, A. S. Almgren, I. Srivastava, "The Divergence of Nearby Trajectories in Soft-Sphere DEM", Particuology, April 1, 2022, 63:1 - 8, doi: 10.1016/j.partic.2021.06.008

A. P. Santos, I. Srivastava, L. E. Silbert, J. B. Lechman, G. S. Grest, "Fluctuations and power-law scaling of dry, frictionless granular rheology near the hard-particle limit", arXiv:2201.03680, January 10, 2022,

J. T. Clemmer, I. Srivastava, G. S. Grest, J. B. Lechman, "Shear is Not Always Simple: Rate-Dependent Effects of Loading Geometry on Granular Rheology", Physical Review Letters, December 22, 2021, 127:268003, doi: 10.1103/PhysRevLett.127.268003

I. Srivastava, L. E. Silbert, J. B. Lechman, G. S. Grest, "Flow and Arrest in Stressed Granular Materials", Soft Matter, December 17, 2021, doi: 10.1039/D1SM01344K

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, August 13, 2021, 3:L032042, doi: 10.1103/PhysRevResearch.3.L032042

I. Srivastava, L. E. Silbert, G. S. Grest, J. B. Lechman, "Viscometric Flow of Dense Granular Materials under Controlled Pressure and Shear Stress", Journal of Fluid Mechanics, November 20, 2020, 907:A18, doi: 10.1017/jfm.2020.811

A. P. Santos, D. S. Bolintineanu, G. S. Grest, J. B. Lechman, S. J. Plimpton, I. Srivastava, L. E. Silbert, "Granular Packings with Sliding, Rolling and Twisting Friction", Physical Review E, September 16, 2020, 102:032903, doi: 10.1103/PhysRevE.102.032903

I. Srivastava, D. S. Bolintineanu, J. B. Lechman, S. A. Roberts, "Controlling Binder Adhesion to Impact Electrode Mesostructure and Transport", ACS Applied Materials & Interfaces, July 2, 2020, 12:34919–3493, doi: 10.1021/acsami.0c08251

I. Srivastava, J. B. Lechman, G. S. Grest, L. E. Silbert, "Evolution of Internal Granular Structure at the Flow-Arrest Transition", Granular Matter, March 23, 2020, 22:41, doi: 10.1007/s10035-020-1003-6

I. Srivastava, B. L. Peters, J. M. D. Lane, H. Fan, K. M. Salerno, G. S. Grest, "Mechanics of Gold Nanoparticle Superlattices at High Hydrostatic Pressures", Journal of Physical Chemistry C, June 20, 2019, 123:17530, doi: 10.1021/acs.jpcc.9b02438

I. Srivastava, L. E. Silbert, G. S. Grest, J. B. Lechman, "Flow-Arrest Transitions in Frictional Granular Matter", Physical Review Letters, January 30, 2019, 122:048003, doi: 10.1103/PhysRevLett.122.048003

K. M. Salerno, D. S. Bolintineanu, G. S. Grest, J. B. Lechman, S. J. Plimpton, I. Srivastava, L. E. Silbert, "Effect of Shape and Friction on the Packing and Flow of Granular Materials", Physical Review E, November 7, 2018, 98:050901(R), doi: 10.1103/PhysRevE.98.050901

L. Y. Leung, C. Mao, I. Srivastava, P. Du, C. Y. Yang, "Flow Function of Pharmaceutical Powders Is Predominantly Governed by Cohesion, Not by Friction Coefficients", Journal of Pharmaceutical Sciences, April 14, 2017, 106:1865, doi: 10.1016/j.xphs.2017.04.012

I. Srivastava, T. S. Fisher, "Slow Creep in Soft Granular Packings", Soft Matter, April 10, 2017, 13:3411, doi: 10.1039/C7SM00237H

K. C. Smith, I. Srivastava, T. S. Fisher, M. Alam, "Variable-Cell Method for Stress-Controlled Jamming of Athermal, Frictionless Grains", Physical Review E, April 4, 2014, 89:042203, doi: 10.1103/PhysRevE.89.042203

I. Srivastava, S. Sadasivam, K. C. Smith, T. S. Fisher, "Combined Microstructure and Heat Conduction Modeling of Heterogeneous Interfaces and Materials", Journal of Heat Transfer, May 16, 2013, 135:061603, doi: 10.1115/1.4023583

Conference Papers

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 Pressure-Induced Phase Transition", Shock Compression of Condensed Matter - 2019, November 4, 2020, 2272:100016, doi: 10.1063/12.0001041

J. M. D. Lane, K. M. Salerno, I. Srivastava, G. S. Grest, H. Fan, "Modeling Pressure-Driven Assembly of Polymer Coated Nanoparticles", Shock Compression of Condensed Matter - 2017, July 3, 2018, 1979:090007, doi: 10.1063/1.5044864

R. Kantharaj, I. Srivastava, K. R. Thaker, A. U. Gaitonde, A. Bruce, J. Howarter, T. S. Fisher, A. M. Marconnet, "Thermal Conduction in Graphite Flake-Epoxy Composites using Infrared Microscopy", 2017 Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITHERM), September 4, 2017, 1-7, doi: 10.1109/ITHERM.2017.8023960

I. Srivastava, K. C. Smith, T. S. Fisher, "Shear-Induced Failure in Jammed Nanoparticle Assemblies", Powders and Grains 2013, June 18, 2013, 1542:86, doi: 10.1063/1.4811873


This three-part thesis describes a versatile computational framework for the simulation of rheology, mechanics and thermal transport in soft granular materials. The class of granular materials investigated here comprise of soft, elastic, frictionless grains at dense volume fractions that undergo fluid-to-solid phase transition upon the application of external stress. The first part of this thesis investigates the rheology of soft granular materials. Chapter 2 describes the theory and numerical implementation of a stress-based rheological method to simulate steady-state flow and creep in soft granular materials and granular suspensions under the application of external hydrostatic and shear stress. The methods introduced in Chapter 2 are implemented in Chapter 3 to investigate the micromechanics of creep in soft granular materials that are uniaxially compressed below the yield threshold. The microscopic insights of creep gained in this chapter are applicable to the widely observed phenomena of slow relaxation dynamics in a wide class of amorphous solids including granular matter, foams and colloids. The second part of this thesis investigates the mechanics of jammed granular solids. Chapter 4 describes a variable-cell enthalpy-based numerical method to simulate stress-induced jamming of soft grains, and probe the mechanics of jammed granular solids. The stress-based methods of Chapter 4 are implemented in Chapter 5 to probe the micromechanical response of a jammed granular solid to quasi-static shear stress. The microscopic insights of the observed stick-slip response to external shear has numerous applications ranging from geological study of earthquakes to the mechanics of a wide class of amorphous solids. In Chapter 6 the influence of attractive forces on the mechanics of jammed granular solids is investigated. The third part of this thesis describes a heat conduction model for sub-micron thermal transport in dense nano-granular thermoelectric materials. The jamming methods of Chapter 4 are used to simulate the compaction and sintering of thermoelectric nanoparticles into solid-state devices. An effective medium heat conduction model that incorporates phonon scattering mechanisms in nanoporous microstructures is implemented to analyze effective thermal conductivity of bottom-up manufactured thermoelectric materials.