Location:
Faculty Hall
Title of talk: Computational Study of Turbulent Flow Interaction between Twin‐Rectangular Jets
Professor Vikram Jayaram, Chairman, Mechanical Sciences Division of IISc, will preside.
Date: Monday, 5th March 2018
Time: 2 pm
Venue: Faculty Hall, IISc
Coffee/Tea: After the seminar
Abstract
Turbulent jets are commonly used in engineering applications. A system of two or more parallel jets has an interesting flow structure, which could accomplish rapid mixing. The mixing feature of parallel jets has several engineering applications, such as its application in cooling of Generation IV very‐high‐temperature nuclear reactors, where the coolants merge in the upper or the lower plenum after passing through the reactor core. Computational fluid dynamics (CFD) simulations are extensively employed in the study of the mixing phenomenon of parallel jets. Therefore, the validation of various turbulence models is of great importance to the process of ensuring that the numerical results are trustworthy and that they serve as a guide for future reactor designs.
In this study, an open source CFD library, namely OpenFOAM, was utilized to conduct the numerical simulation of twin parallel rectangular jets. Simulations were made with Reynolds‐averaged Navier–Stokes (RANS) model, transient partially averaged Navier–Stokes (PANS) model, unsteady Reynolds‐averaged Navier–Stokes (URANS) model, and a Large Eddy Simulation (LES) technique. Steady‐state simulations showed that with proper boundary conditions at the inlets, the mean velocity data agreed with the experimental data well within an engineering accuracy (14%). The PANS model predicted the merging point within 4.3% of the experimental data. Power Spectrum Density (PSD) analysis was performed based on the velocity at four sample locations to compare resolved frequencies between the PANS and the URANS models. Based on the PSD analysis, we conclude that PANS model presented better capabilities in resolving higher turbulence flow frequencies compared to the URANS. The LES simulation results showed good agreement with the experimental data.
Biography of the speaker
Professor N.K. Anand is a Professor in the Department of Mechanical Engineering at Texas A&M University, which he joined in 1985. He is currently serving as Associate Director, Texas A&M Engineering Experiment Station and Executive Associate Dean of Engineering. Professor N.K. Anand received his Bachelor’s degree in Mechanical Engineering from Bangalore University, his masters in Mechanical Engineering, from the Kansas State University and Ph.D. in Mechanical Engineering from Purdue University. His research interests are Condensation Heat Transfer, Numerical Heat Transfer and Fluid Flow, Numerical Techniques, Heat Exchangers, Porous media, and aerosols. Prof. Anand has made many contributions in both heat transfer and aerosol fields, which include numerical modeling of conjugate heat transfer with applications to cooling of electronic equipment, heat transfer in serpentine channels, condensation of non-CFC refrigerants in smooth horizontal tubes, and modeling of transport of aerosols through sampling lines. He has authored over 75 refereed journal articles. These publications are in archival flagship journals such as the ASME Journal of Heat Transfer, International Journal of Heat and Mass Transfer, Numerical Heat Transfer, and Aerosol Science and Technology.
All are welcome.
