55th NIA CFD Seminar Webcast: Entropy stable wall boundary conditions for the compressible Navier–Stokes equations by Matteo Parsani

November 17, 2014 - Leave a Response

55th NIA CFD Seminar

Topic: Entropy stable wall boundary conditions for the compressible Navier–Stokes equations

Date: Tuesday, December 02, 2014

Time: 11:00am-noon (EST)

Room: NIA, Rm137

Speaker: Matteo Parsani

Speaker Bio: Dr. Matteo Parsani is currently a Post-doctoral Fellow at NASA Langley Research Center, working with Dr. Mark H. Carpenter. Prior to this he was a Post-doctoral Researcher at KAUST, working in the group of Professor David Ketcheson. He received his Ph.D. in Mechanical and Aerospace Engineering from Free University of Brussels in December 2010. His research interests include high-order accurate methods for large-eddy simulation and aeroacoustics, efficient explicit and implicit time integrators and acceleration techniques for compressible flows. In 2011 his PhD thesis was selected among the best National Ph.D. theses to be presented at the ECCOMAS Olympiad workshop in Athens.

Abstract: Non-linear entropy stability and a summation-by-parts framework are used to derive entropy stable wall boundary conditions for the compressible Navier–Stokes equations. A semi-discrete entropy estimate for the entire domain is achieved when the new boundary conditions are coupled with an entropy stable discrete interior operator. The data at the boundary are weakly imposed using a penalty flux approach and a simultaneous-approximation-term penalty technique. Although discontinuous spectral collocation operators are used herein for the purpose of demonstrating their robustness and efficacy, the new boundary conditions are compatible with any diagonal norm summation-by-parts spatial operator, including finite element, finite volume, finite difference, discontinuous Galerkin, and flux reconstruction schemes. The proposed boundary treatment is tested for three-dimensional subsonic and supersonic flows. The numerical computations corroborate the non-linear stability (entropy stability) and accuracy of the boundary conditions.

Additional information, including the webcast link, can be found at the NIA CFD Seminar website, which is temporarily located at

http://www.hiroakinishikawa.com/niacfds/index.html

 
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TODAY: 54th NIA CFD Seminar Webcast: Recent Applications of Overset Mesh Technology in SC/Tetra by Tomohiro Irie

October 6, 2014 - Leave a Response

54th NIA CFD Seminar

Topic: Recent Applications of Overset Mesh Technology in SC/Tetra

Date: Monday, October 06, 2014

Time: 1:00pm-2:00pm (EDT)

Room: NIA, Rm101

Speaker: Tomohiro Irie

Speaker Bio: Tomohiro Irie is Assistant Manager of Software Engineering Department at Software Cradle Co., Ltd.
in charge of SC/Tetra‘s solver component.

Abstract: Software Cradle has introduced overset mesh technology to SC/Tetra since 2007, and we are dealing with a lot of demands from industries using the technology. This is a necessary function for flow simulation with moving components in complex geometries, which is not uncommon in real products. SC/Tetra’s overset technology has been improved continuously, and is now able to be coupled with free-surface analysis, flow-structure interaction and dynamical moving components (6DOF). In the latest version, a special treatment for analyses of the flow in piston engines was introduced. The treatment achieves practical accuracy for mass conservation in the cylinder.

Additional information, including the webcast link, can be found at the NIA CFD Seminar website, which is temporarily located at
http://www.hiroakinishikawa.com/niacfds/index.html  

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