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Nirmal Rai
Nirmal Rai
Other namesNirmal K. Rai, Nirmal Kumar Rai, NK Rai
Principal Research Engineer, RTX Technology Research Center
Verified email at rtx.com
Title
Cited by
Cited by
Year
High-resolution simulations of cylindrical void collapse in energetic materials: Effect of primary and secondary collapse on initiation thresholds
NK Rai, MJ Schmidt, HS Udaykumar
Physical Review Fluids 2 (4), 043202, 2017
862017
Mesoscale simulation of reactive pressed energetic materials under shock loading
NK Rai, HS Udaykumar
Journal of Applied Physics 118 (24), 2015
792015
Three-dimensional simulations of void collapse in energetic materials
NK Rai, HS Udaykumar
Physical review fluids 3 (3), 033201, 2018
742018
Void collapse generated meso-scale energy localization in shocked energetic materials: Non-dimensional parameters, regimes, and criticality of hotspots
NK Rai, HS Udaykumar
Physics of Fluids 31 (1), 2019
692019
Collapse of elongated voids in porous energetic materials: Effects of void orientation and aspect ratio on initiation
NK Rai, MJ Schmidt, HS Udaykumar
Physical review fluids 2 (4), 043201, 2017
662017
Multi-scale shock-to-detonation simulation of pressed energetic material: A meso-informed ignition and growth model
O Sen, NK Rai, AS Diggs, DB Hardin, HS Udaykumar
Journal of Applied Physics 124 (8), 2018
612018
Modeling mesoscale energy localization in shocked HMX, part I: machine-learned surrogate models for the effects of loading and void sizes
A Nassar, NK Rai, O Sen, HS Udaykumar
Shock Waves 29, 537-558, 2019
462019
Modeling mesoscale energy localization in shocked HMX, Part II: training machine-learned surrogate models for void shape and void–void interaction effects
S Roy, NK Rai, O Sen, DB Hardin, AS Diggs, HS Udaykumar
Shock Waves 30 (4), 349-371, 2020
302020
Treatment of contact separation in Eulerian high‐speed multimaterial dynamic simulations
NK Rai, A Kapahi, HS Udaykumar
International journal for numerical methods in engineering 100 (11), 793-813, 2014
272014
Mechanics of shock induced pore collapse in poly (methyl methacrylate)(PMMA): Comparison of simulations and experiments
NK Rai, EM Escauriza, DE Eakins, HS Udaykumar
Journal of the Mechanics and Physics of Solids 143, 104075, 2020
232020
Evaluation of reaction kinetics models for meso-scale simulations of hotspot initiation and growth in HMX
NK Rai, SP Koundinyan, O Sen, IV Schweigert, BF Henson, ...
Combustion and flame 219, 225-241, 2020
232020
Structure–property–performance linkages for heterogenous energetic materials through multi-scale modeling
S Roy, O Sen, NK Rai, M Moon, E Welle, C Molek, KK Choi, ...
Multiscale and Multidisciplinary Modeling, Experiments and Design 3, 265-293, 2020
212020
Macro-scale sensitivity through meso-scale hotspot dynamics in porous energetic materials: Comparing the shock response of 1, 3, 5-triamino-2, 4, 6-trinitrobenzene (TATB) and 1 …
NK Rai, O Sen, HS Udaykumar
Journal of applied physics 128 (8), 2020
212020
Structure–property linkage in shocked multi-material flows using a level-set-based Eulerian image-to-computation framework
S Roy, NK Rai, O Sen, HS Udaykumar
Shock Waves 30 (5), 443-472, 2020
172020
Effects of parametric uncertainty on multi-scale model predictions of shock response of a pressed energetic material
S Lee, O Sen, NK Rai, NJ Gaul, KK Choi, HS Udaykumar
Journal of applied physics 125 (23), 2019
162019
Unified approach for meso-informed burn models in shocked energetic materials
HS Udaykumar, O Sen, S Lee, NK Rai
Journal of propulsion and power 36 (5), 655-667, 2020
122020
Modeling impact‐induced damage and debonding using levelsets in a sharp interface Eulerian framework
A de Brauer, NK Rai, ME Nixon, HS Udaykumar
International Journal for Numerical Methods in Engineering, 0
11
Numerical framework for mesoscale simulation of heterogeneous energetic materials
NK Rai
The University of Iowa, 2015
82015
Evaluation of thermodynamic closure models for partially reacted two-phase mixture of condensed phase explosives
NK Rai, TD Aslam
Journal of Applied Physics 131 (18), 2022
62022
Novel method to control explosive shock sensitivity: A mesoscale study to understand the effect of thermally expandable microsphere (TEM) inclusions in high explosives (HE …
NK Rai, W Lee Perry, AL Duque
Journal of Applied Physics 131 (17), 2022
62022
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Articles 1–20