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Japan Aerospace Exploration Agency

Unsteady CFD technologies for the entire flight envelope

Highly efficient analysis tools for aerodynamics, HexaGrid, and FaSTAR, have successfully lowered the start-up hurdles for CFD users by enhancing data productivity with automation and acceleration. However, it is only for the cruise condition that we can obtain reliable results in the aerodynamic analysis of aircraft. Therefore, in this study, our objective is to realize CFD that can be used not only during aircraft cruise but also in the entire flight envelope, by investigating accurate CFD schemes that are applicable for unsteady phenomena such as aerodynamic buffeting and flow separation.

To this end, we need to resolve the many issues concerning grid generation and flow solver. For the former, we are endeavoring to develop a high-speed grid generation tool for a vast number of grid points by integrating the parallelization technique of BCM (Building Cube Method) with HexaGrid. Meanwhile, for the latter, we are also extending the capability of FaSTAR so as to simulate unsteady phenomena with high reliability and at a low cost. This will be accomplished through combining high-speed time integration methods with high-resolution schemes, and also by advancing the hybrid of RANS and LES. Our sophisticated and powerful supercomputer will play an important role in realizing this study’s objective.

Computational grid for the NASA CRM wing, generated by parallelization technique

Simulation example of the high-speed buffet on a short-span wing