Search Results - "Girimaji, Sharath S."

Turbulence closure modeling with machine learning: a foundational physics perspective by Girimaji, Sharath S

“…Turbulence closure modeling using machine learning (ML) is at an early crossroads. The extraordinary success of ML in a variety of challenging fields had given…”
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Turbulence closure modeling with data-driven techniques: physical compatibility and consistency considerations by Taghizadeh, Salar, Witherden, Freddie D, Girimaji, Sharath S

“…A recent thrust in turbulence closure modeling research is to incorporate machine learning (ML) elements, such as neural networks, for the purpose of enhancing…”
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Revisiting turbulence small-scale behavior using velocity gradient triple decomposition by Das, Rishita, Girimaji, Sharath S

“…Turbulence small-scale behavior has been commonly investigated in literature by decomposing the velocity-gradient tensor (Aij) into the symmetric strain-rate…”
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Linear Stability Analysis and Gas Kinetic Scheme (GKS) Simulations of Instabilities in Compressible Plane Poiseuille Flow by Ankita Mittal, Ankita Mittal, Bajrang Sharma, Bajrang Sharma, Sharath S. Girimaji, Sharath S. Girimaji

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Unified Gas Kinetic Simulations of Lid-Driven Cavity Flows: Effect of Compressibility and Rarefaction on Vortex Structures by Venugopal, Vishnu, Iphineni, Haneesha, Praturi, Divya Sri, Girimaji, Sharath S.

“…We investigate and characterize the effect of compressibility and rarefaction on vortex structures in the benchmark lid-driven cavity flow. Direct numerical…”
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Towards Reconstruction of Complex Flow Fields Using Unit Flows by Kristo, Paul J., Kimber, Mark L., Girimaji, Sharath S.

“…Many complex turbulent flows in nature and engineering can be qualitatively regarded as being constituted of multiple simpler unit flows. The objective of this…”
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Challenges in Scale-Resolving Simulations of turbulent wake flows with coherent structures by Pereira, Filipe S., Eça, Luís, Vaz, Guilherme, Girimaji, Sharath S.

“…The objective of this work is to investigate the challenges encountered in Scale-Resolving Simulations (SRS) of turbulent wake flows driven by…”
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On the simulation of the flow around a circular cylinder at Re=140,000 by Pereira, Filipe S., Eça, Luís, Vaz, Guilherme, Girimaji, Sharath S.

“…•Study of the flow around a circular cylinder at Re=140,000 with RANS and SRS.•TSL regime governed by Kelvin–Helmholtz and Vortex-Shedding…”
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Toward Predictive RANS and SRS Computations of Turbulent External Flows of Practical Interest by Pereira, Filipe S., Eça, Luís, Vaz, Guilherme, Girimaji, Sharath S.

“…We investigate the main challenges to prediction of turbulent external flows of practical interest with Reynolds-Averaged Navier–Stokes equations (RANS) and…”
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Pressure-strain energy redistribution in compressible turbulence: return-to-isotropy versus kinetic-potential energy equipartition by Lee, Kurnchul, Venugopal, Vishnu, Girimaji, Sharath S

“…Return-to-isotropy and kinetic-potential energy equipartition are two fundamental pressure-moderated energy redistributive processes in anisotropic…”
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Velocity-Gradient Dynamics in Turbulence: Effect of Viscosity and Forcing by Jeong, Eunhwan, Girimaji, Sharath S

“…The restricted Euler equation is a promising but incomplete model for velocity-gradient dynamics in turbulent flows. While it captures many of the geometric…”
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Power Extraction from an Oscillating Water Column; Experimental Setup and Preliminary Results by Gionet-Gonzales, Julia, Koola, Paul M., Girimaji, Sharath S.

“…The need for alternative energy sources is at an all-time high due to the increased awareness of climate-related issues. Wave energy utilizing the transient…”
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Wave Energy Converter Integrated with Breakwater: Experimental Investigation of Hydrodynamic Efficiency by Mullen, Ashley N., Koola, Paul M., Girimaji, Sharath S.

“…Wave energy conversion integrated with breakwaters can share costs between coastal barriers and energy production, thereby improving the cost-effectiveness of…”
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LES of turbulent square jet flow using an MRT lattice Boltzmann model by Yu, Huidan, Luo, Li-Shi, Girimaji, Sharath S.

“…In this paper we consider the application of multiple-relaxation-time (MRT) lattice Boltzmann equation (LBE) for large-eddy simulation (LES) of turbulent…”
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DNS and LES of decaying isotropic turbulence with and without frame rotation using lattice Boltzmann method by Yu, Huidan, Girimaji, Sharath S., Luo, Li-Shi

“…The objective of the paper is to assess the effectiveness of the lattice Boltzmann equation (LBE) as a computational tool for performing direct numerical…”
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Boltzmann kinetic equation for filtered fluid turbulence by Girimaji, Sharath S

“…We develop a kinetic Boltzmann equation for describing filtered fluid turbulence applicable for continuum and noncontinuum effects. The effect of unresolved…”
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On air-chemistry reduction for hypersonic external flow applications by Ibrahim, Ashraf, Suman, Sawan, Girimaji, Sharath S.

“…•The existence of the slow manifold for the air-mixture system is shown.•The QSSA estimate of the slow manifold is fairly accurate.•For mid-temperature range…”
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Pressure–Strain Correlation Modeling: Towards Achieving Consistency with Rapid Distortion Theory by Mishra, Aashwin A., Girimaji, Sharath S.

“…In turbulence closure modeling, it is widely accepted that the rapid pressure–strain correlation (RPSC) model be consistent with the rapid distortion theory…”
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Theory of the lattice Boltzmann method: two-fluid model for binary mixtures by Luo, Li-Shi, Girimaji, Sharath S

“…A two-fluid lattice Boltzmann model for binary mixtures is developed. The model is derived formally from kinetic theory by discretizing two-fluid Boltzmann…”
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Explicit algebraic Reynolds stress model (EARSM) for compressible shear flows by Gomez, Carlos A., Girimaji, Sharath S.

“…We develop an explicit algebraic Reynolds stress model (EARSM) for high-speed compressible shear flows and validate the model with direct numerical simulation…”
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