Affiliation:
1. National University of Defense Technology
Abstract
This paper develops an automatic nested agglomeration methodology for 2D multigrid flow solutions over anisotropic unstructured grids. The algorithm combines isotropic quadtree based coarsening and anisotropic directional agglomeration method to yield a desired coarsening ratio and high quality of coarse grids, which works on cell-centered finite volume scheme. This coarsening strategy developed is presented on an unstructured grid over the RAE2822 airfoil. It is shown that the present method provides more suitable coarsening ratio and aspect ratio at all coarse grid levels than only quadtree based coarsening method.
Publisher
Trans Tech Publications, Ltd.
Reference8 articles.
1. M.H. Lallemand, H. Steve, A. Dervieux, Unstructured multigridding by volume agglomeration: Current status, Computers & Fluids. 21 (1992) 397-433.
2. W.A. Smith, Multigrid solution of transonic flow on unstructured grids, Adv. App. Comp. Flu. Dyn. (1990).
3. D. Strauss, J.L.F. Azevedo, On the development of an agglomeration multigrid solver for turbulent flows. J. Braz. Soci. Eng. 25 (2003) 315–324.
4. K.A. Sørensen, O. Hassan, K. Morgan and N.P. Weatherill, Agglomerated multigrid on hybrid unstructured meshes for compressible flow, Int. J. Numer. Meth. Fluids, 40 (2002) 593-603.
5. M. Emel, H.T. ismail, A Haluk, Development of a Quadtree Based Agglomeration Method for a Multigrid Viscous Flow Solver on Unstructured Grids, AIAA paper 2010-316.