44th NIA CFD Seminar

Topic: Development of Fast and Efficient CFD Tools, HexaGrid and FaSTAR

Date: Tuesday, March 4, 2014

Time: 11:00am-noon (EST)

Room: NIA, Rm137

Speaker: Atsushi Hashimoto

Speaker Bio: Dr. Atsushi Hashimoto is a researcher at Japan Aerospace Exploration Agency (JAXA). He earned Ph.D. in Aerospace Engineering at Nagoya University, Japan in 2007. He joined JAXA in 2007. His area of expertise is aerodynamic prediction with unstructured-grid CFD, aeroacoustics, and aeroelasticity.

Abstract: We have developed efficient CFD tools: an automatic hexahedra grid generator “HexaGrid” and a fast flow solver “FaSTAR”. HexaGrid can generate Cartesian-based unstructured grids with body-fitted layer grids just by inputting CAD geometry data and several control parameters such as surface grid sizes and domain sizes. Since the layer grids are generated by a projection method, the time-consuming work that repairs gaps and overlaps of surface data is minimized. FaSTAR is a compressible flow solver of unstructured grids. It employs a simple face-based data structure and this helps performance optimization of the codes. An agglomerated multigrid method is also utilized to accelerate convergence. The octree data structure of the Cartesian grid is used for the agglomeration to keep the coarse-grid quality. Steady and unsteady simulations with HexaGrid and FaSTAR are presented at the seminar. We finally show a future outlook of CFD code development.

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