Shock waves and turbulence: Physical modeling, Numerical challenges.... by Krishnendu Sinha скачать в хорошем качестве

Shock waves and turbulence: Physical modeling, Numerical challenges.... by Krishnendu Sinha

DATE & TIME: Mon, 19 November 2018, 15:00 to 16:00 VENUE: Emmy Noether Seminar Room, ICTS Campus, Bangalore ABSTRACT: Shock waves are discontinuities in high-speed flows that can lead to high pressure and gas temperature. Shock waves can also enhance turbulent mixing and heat transfer. Interaction of homogeneous isotopic turbulence with a normal shock is one of the most fundamental interaction. It has been studied extensively using theoretical analysis and large scale direct numerical simulation (DNS). On the other hand, theoretical tools like linear interaction analysis (LIA) treat the shock as a discontinuity and predict the downstream statistics based on Kovasznay mode decomposition. In our research group, we have used LIA and DNS in a complementary way to investigate turbulence amplification and the enhanced heat transfer at shock waves. The unsteady shock oscillations is found to play an important role and including its effect shows significant improvement in post-shock predictions. Several applications to supersonic and hypersonic shock-boundary layer interaction will be presented. Table of Contents (powered by https://videoken.com) 0:00:00 Start 0:00:10 Shock waves and turbulence physical modeling, numerical challenges and practical applications 0:05:46 Shock-turbulence interaction 0:07:48 Shock Waves in Aerospace Vehicles 0:11:38 Astrophysics and Nuclear engineering 0:12:50 Canonical Shock-Turbulence Interaction 0:14:37 Experiments, Simulations & Analysis 0:18:14 Direct numerical simulation 0:27:16 Turbulence kinetic energy 0:30:52 Amplification of Enstrophy 0:35:44 Post-shock thermodynamic field 0:39:31 Linear Interaction Analysis 0:41:49 Shock frame of reference 0:44:13 Integration over 3D spectrum 0:46:34 LIA matches Direct Numerical Simulation 0:48:28 Turbulence kinetic energy 0:50:33 Theoretical Analysis 0:52:05 Baroclinic effect on vorticity 0:53:44 Propagating and decaying regimes 1:00:00 Enhanced Turbulent Heat transfer 1:03:38 Modeling and Simulation 1:03:58 Transport equation for TKE 1:04:12 Shock-boundary layer interaction 1:05:19 Modeling turbulent heat transfer 1:06:26 Lower turbulent Prandtl no. at shock 1:06:43 New model gives significant improvement 1:07:57 High Heat transfer at shock impingement 1:08:49 From Fundamentals to Applied Fluid Mechanics in Hypersonic Flows 1:09:22 Thank you...