Search Results - "UdayKumar, H.S."

Uncertainty quantification in Eulerian–Lagrangian simulations of (point-)particle-laden flows with data-driven and empirical forcing models by Jacobs, Gustaaf B., Udaykumar, H.S.

“…•A first investigation from a probabilistic point of view is presented into the effects of uncertainty in empirical and data-driven point-particle forcing…”
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Transient multi-day simulations of thermal storage and heat extraction for a finned solar thermal storage device by Augspurger, Mike, Udaykumar, H.S.

“…•48-h long simulations of latent-heat thermal storage devices are performed.•Four devices, each with a different aluminum finned heat spreader, are…”
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Strategies for efficient machine learning of surrogate drag models from three-dimensional mesoscale computations of shocked particulate flows by Das, Pratik, Sen, Oishik, Choi, K.K., Jacobs, Gustaaf, Udaykumar, H.S.

“…•Cost-effective strategies for developing surrogate models for drag on particles in shocked flows are explored.•A machine learning technique is used to develop…”
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Computation of Solid–Liquid Phase Fronts in the Sharp Interface Limit on Fixed Grids by Udaykumar, H.S, Mittal, R, Shyy, Wei

“…A finite-difference formulation is applied to track solid–liquid boundaries on a fixed underlying grid. The interface is not of finite thickness but is treated…”
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A particle-level set-based sharp interface cartesian grid method for impact, penetration, and void collapse by Tran, L.B., Udaykumar, H.S.

“…An Eulerian, sharp interface, Cartesian grid method is developed for the numerical simulation of the response of materials to impact, shocks and detonations…”
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Multiscale modeling of particle–solidification front dynamics, Part I: Methodology by Garvin, J.W., Yang, Y., Udaykumar, H.S.

“…The interaction between an advancing solidification front and a micron-size particle is an inherently multiscale heat and mass transport problem. Transport at…”
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Particle–solidification front dynamics using a fully coupled approach, Part I: methodology by Garvin, J.W, Udaykumar, H.S

“…The interaction of a solidification front with an embedded particle is studied using numerical simulations to couple phase change with particle motion. The…”
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Multiphase Dynamics in Arbitrary Geometries on Fixed Cartesian Grids by Udaykumar, H.S., Kan, Heng-Chuan, Shyy, Wei, Tran-Son-Tay, Roger

“…In this work, a mixed Eulerian–Lagrangian algorithm, calledELAFINT(Eulerian Lagrangian algorithm for interface tracking) is developed further and applied to…”
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Sharp-interface calculations of the vaporization rate of reacting aluminum droplets in shocked flows by Das, Pratik, Udaykumar, H.S.

“…•The numerical study of aluminum droplet combustion shows a transition from diffusion-limited combustion to kinetically limited combustion at high Mach…”
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A simulation-derived surrogate model for the vaporization rate of aluminum droplets heated by a passing shock wave by Das, Pratik, Udaykumar, H.S.

“…•The current paper is the first attempt to study the effects of Mach numberon the Sherwood numberfor vaporizing Al droplets using sharp interfacenumerical…”
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A sharp-interface method for the simulation of shock-induced vaporization of droplets by Das, Pratik, Udaykumar, H.S.

“…A sharp-interface method is developed to calculate the vaporization of droplets in high-speed flows. The levelset method is used to track the liquid-gas…”
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Evaluation of convergence behavior of metamodeling techniques for bridging scales in multi-scale multimaterial simulation by Sen, Oishik, Davis, Sean, Jacobs, Gustaaf, Udaykumar, H.S.

“…The effectiveness of several metamodeling techniques, viz. the Polynomial Stochastic Collocation method, Adaptive Stochastic Collocation method, a Radial Basis…”
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Evaluation of multifidelity surrogate modeling techniques to construct closure laws for drag in shock–particle interactions by Sen, Oishik, Gaul, Nicholas J., Choi, K.K., Jacobs, Gustaaf, Udaykumar, H.S.

“…Meta- (or surrogate-) models constructed from meso-scale simulations can be used in place of empirical correlations to close macro-scale equations. In shocked…”
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A three-dimensional sharp interface Cartesian grid method for solving high speed multi-material impact, penetration and fragmentation problems by Kapahi, A., Sambasivan, S., Udaykumar, H.S.

“…This work presents a three-dimensional, Eulerian, sharp interface, Cartesian grid technique for simulating the response of elasto-plastic solid materials to…”
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Deep learning for synthetic microstructure generation in a materials-by-design framework for heterogeneous energetic materials by Chun, Sehyun, Roy, Sidhartha, Nguyen, Yen Thi, Choi, Joseph B., Udaykumar, H. S., Baek, Stephen S.

“…The sensitivity of heterogeneous energetic (HE) materials (propellants, explosives, and pyrotechnics) is critically dependent on their microstructure…”
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Evaluation of kriging based surrogate models constructed from mesoscale computations of shock interaction with particles by Sen, Oishik, Gaul, Nicholas J., Choi, K.K., Jacobs, Gustaaf, Udaykumar, H.S.

“…Macro-scale computations of shocked particulate flows require closure laws that model the exchange of momentum/energy between the fluid and particle phases…”
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Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments by Rai, Nirmal Kumar, Escauriza, Emilio M., Eakins, Daniel E., Udaykumar, H.S.

“…Head-to-head comparisons are made between calculations and experimental data on shock-driven pore collapse in the transparent material, poly(methyl…”
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Optimizing fin design for a PCM-based thermal storage device using dynamic Kriging by Augspurger, Mike, Choi, K.K., Udaykumar, H.S.

“…•A strategy for the optimization of latent heat thermal storage device is proposed.•Dynamic Kriging is used to create a response surface for the objective…”
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Simulation of high speed impact, penetration and fragmentation problems on locally refined Cartesian grids by Sambasivan, S., Kapahi, A., Udaykumar, H.S.

“…Techniques are presented to solve problems involving high speed material interactions that can lead to large deformations followed by fragmentation. To…”
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Three-dimensional simulations of dynamics of void collapse in energetic materials by Kapahi, A., Udaykumar, H. S.

“…This work presents the response of a porous heterogeneous energetic material subjected to severe loading conditions. Spherical voids are embedded in an…”
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