VERIFICATION AND VALIDATION OF HYPERFLOW SOLVER FOR SUBSONIC AND TRANSONIC TURBULENT FLOW SIMULATIONS ON UNSTRUCTURED/HYBRID GRIDS

Computational fluid dynamics (CFD) is playing a more and more important role in aerospace and relevant industries. While the credibility of CFD numerical simulation requires continuous verification and validation. This paper proposes for CFD solvers a complete verification and validation procedure including rigorous accuracy tests based on the method of manufactured solutions (MMS), simple and complex turbulent flow simulation and grid convergence study. The procedure is implemented on the in-house CFD solver HyperFLOW on verifying and validating its ability on subsonic and transonic turbulent flow simulation. We firstly verified that HyperFLOW can achieve designed second-order accuracy on arbitrary unstructured grids via numerical accuracy tests based on the MMS of the Euler equation and the diffusion equation. Then, simple subsonic turbulent flow cases, such as the turbulent flat plate, the 2D Airfoil Near-Wake and the 2D Bump cases from NASA Turbulence Modeling Resources are taken into consideration for grid convergence tests. Observed accuracy order and grid convergence index are calculated and compared with the results obtained by CFL3D and FUN3D, which verified and validated the accuracy and grid convergence performance of HyperFLOW in simple case simulation. Finally, the NASA Common Research Model in Drag Prediction Workshop VI is simulated with fixed lift coefficient, and grid convergence study is carried out on a series of refined grids. Drag polar is predicted by HyperFLOW and compared with other verified and validated results. It demonstrated that HyperFLOW has good accuracy and grid convergence performance in complex configuration high Reynolds subsonic and transonic turbulent flow simulation on unstructured/hybrid grids.