HEMLAB Algorithm Applied to 4th AIAA CFD High Lift Prediction Workshop

The NASA High-Lift Common Research Model (CRM-HL) has been investigated using the HEMLAB algorithm in order to numerically predict stall characteristics at high angle of attacks. The numerical method is based on a vertex based finite volume method on hybrid meshes using the quad-and half-edge data structures. In order to improve numerical accuracy, the pyAMG anisotropic mesh adaptation library from INRIA is integrated in order to improve mesh resolution near the high gradient regions. The resulting algebraic equations due to the compressible Navier-Stokes and the one equation Spallart-Allmaras turbulence equations are solved in a monolithic manner using the restricted additive Schwarz precon-ditioner combined with the FGMRES Krylov subspace algorithm within the PETSc library. The numerical simulations are carried out around the NASA High-Lift Common Research Model at pre-and post-stall angles of attack. The numerical dissipation effects are observed to be critical for the accuracy of the resulting aerodynamic loads at high angles of attack. The results with the anisotropic mesh refinement indicate relatively good agreement with the committee experimental results.