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Featured researches published by Venkatesh Gopalakrishnan.


Journal of Engineering for Gas Turbines and Power-transactions of The Asme | 2014

RANS and Large Eddy Simulation of Internal Combustion Engine Flows—A Comparative Study

Xiaofeng Yang; Saurabh Gupta; Tang-Wei Kuo; Venkatesh Gopalakrishnan

A comparative cold flow analysis between Reynolds-averaged Navier–Stokes (RANS) and large eddy simulation (LES) cycle-averaged velocity and turbulence predictions is carried out for a single cylinder engine with a transparent combustion chamber (TCC) under motored conditions using high-speed particle image velocimetry (PIV) measurements as the reference data. Simulations are done using a commercial computationally fluid dynamics (CFD) code CONVERGE with the implementation of standard k-e and RNG k-e turbulent models for RANS and a one-equation eddy viscosity model for LES. The following aspects are analyzed in this study: The effects of computational domain geometry (with or without intake and exhaust plenums) on mean flow and turbulence predictions for both LES and RANS simulations. And comparison of LES versus RANS simulations in terms of their capability to predict mean flow and turbulence. Both RANS and LES full and partial geometry simulations are able to capture the overall mean flow trends qualitatively; but the intake jet structure, velocity magnitudes, turbulence magnitudes, and its distribution are more accurately predicted by LES full geometry simulations. The guideline therefore for CFD engineers is that RANS partial geometry simulations (computationally least expensive) with a RNG k-e turbulent model and one cycle or more are good enough for capturing overall qualitative flow trends for the engineering applications. However, if one is interested in getting reasonably accurate estimates of velocity magnitudes, flow structures, turbulence magnitudes, and its distribution, they must resort to LES simulations. Furthermore, to get the most accurate turbulence distributions, one must consider running LES full geometry simulations.


Volume 2: Fuels; Numerical Simulation; Engine Design, Lubrication, and Applications | 2013

RANS and LES of IC Engine Flows: A Comparative Study

Xiaofeng Yang; Saurabh Gupta; Tang-Wei Kuo; Venkatesh Gopalakrishnan

A comparative cold flow analysis between Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) cycle-averaged velocity and turbulence predictions is carried out for a single cylinder engine with transparent combustion chamber (TCC) under motored conditions using high-speed Particle Image Velocimetry (PIV) measurements as the reference data. Simulations are done using a commercial CFD code CONVERGE with the implementation of standard k-e and RNG k-e turbulent models for RANS and a one-equation eddy viscosity model for LES. The following aspects are analyzed in this study:1. The effects of computational domain geometry (with or without intake and exhaust plenums) on mean flow and turbulence predictions for both LES and RANS simulations2. Comparison of LES versus RANS simulations in terms of their capability to predict mean flow and turbulenceBoth RANS and LES full and partial geometry simulations are able to capture the overall mean flow trends qualitatively; but the intake jet structure, velocity magnitudes, turbulence magnitudes and its distribution are more accurately predicted by full geometry simulations.The guideline therefore for CFD engineers is that RANS partial geometry simulations (computationally least expensive) are good enough for capturing overall qualitative flow trends. However, if one is interested in getting reasonably accurate estimates of velocity magnitudes, flow structures, turbulence magnitudes and its distribution, they must resort to LES simulations. Furthermore, to get the most accurate turbulence distributions, one must consider running LES full geometry simulations.Copyright


SAE International journal of engines | 2011

Study of High Speed Gasoline Direct Injection Compression Ignition (GDICI) Engine Operation in the LTC Regime

Youngchul Ra; Paul Loeper; Rolf D. Reitz; Michael Andrie; Roger Krieger; David E. Foster; Russ Durrett; Venkatesh Gopalakrishnan; Alejandro H. Plazas; Richard C. Peterson; Patrick G. Szymkowicz


Archive | 2010

Internal combustion engine utilizing dual compression and dual expansion processes

Russell P. Durrett; Venkatesh Gopalakrishnan


Flow Turbulence and Combustion | 2013

Large-eddy Simulation of Motored Flow in a Two-valve Piston Engine: POD Analysis and Cycle-to-cycle Variations

Kai Liu; Daniel C. Haworth; Xiaofeng Yang; Venkatesh Gopalakrishnan


Fuel | 2016

The effect of nozzle geometry over internal flow and spray formation for three different fuels

Raul Payri; Juan P. Viera; Venkatesh Gopalakrishnan; Patrick G. Szymkowicz


Fuel | 2017

The effect of nozzle geometry over the evaporative spray formation for three different fuels

Raul Payri; Juan P. Viera; Venkatesh Gopalakrishnan; Patrick G. Szymkowicz


Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles | 2014

Large Eddy Simulation (LES) for IC Engine Flows

Tang-Wei Kuo; Xiaofeng Yang; Venkatesh Gopalakrishnan; Zhaohui Chen


Archive | 2009

Engine with internal exhaust gas recirculation and method thereof

Russell P. Durrett; Venkatesh Gopalakrishnan


SAE Technical Paper Series (Society of Automotive Engineers) | 2016

An Analytical Assessment of the CO 2 Emissions Benefit of Two-Stroke Diesel Engines

Alok Warey; Venkatesh Gopalakrishnan; Michael Potter; Enrico Mattarelli; Carlo Alberto Rinaldini

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Juan P. Viera

Polytechnic University of Valencia

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Raul Payri

Polytechnic University of Valencia

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Carlo Alberto Rinaldini

University of Modena and Reggio Emilia

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