비정렬 격자계에서 고차정확도 불연속 갤러킨 기법을 이용한 블레이드-와류 간섭 현상 모사

HIGH-ORDER ACCURATE SIMULATIONS OF BLADE-VORTEX INTERACTION USING A DISCONTINUOUS GALERKIN METHOD ON UNSTRUCTURED MESHES

A high-order accurate Euler flow solver based on a discontinuous Galerkin finite-element method has been developed for the numerical simulations of blade-vortex interaction phenomena on unstructured meshes. A free vortex in freestream was investigated to assess the vortex-preserving property and the accuracy of the present flow solver. Blade-vortex interaction problems in subsonic and transonic freestreams were simulated by adopting a multi-level solution-adaptive dynamic mesh refinement/coarsening technique. The results were compared with those of other numerical and experimental methods. It was shown that the present discontinuous Galerkin flow solver can preserve the vortex structure for significantly longer vortex convection time and can accurately capture the complex unsteady blade-vortex interaction flows, including generation and propagation of acoustic waves.