Coarsening Strategies for Unstructured Multigrid Techniques with Application to Anisotropic Problems
نویسندگان
چکیده
منابع مشابه
Coarsening Strategies for Unstructured Multigrid Techniques with Application to Anisotropic Problems
Over the years, multigrid has been demonstrated as an efficient technique for solving inviscid flow problems. However, for viscous flows, convergence rates often degrade. This is generally due to the required use of stretched meshes (i.e., the aspect ratio AR = ∆y/∆x << 1) in order to capture the boundary layer near the body. Usual techniques for generating a sequence of grids that produce prop...
متن کاملMultigrid Strategies for Viscous Flow Solvers on Anisotropic Unstructured Meshes
Unstructured multigrid techniques for relieving the stiffness associated with high-Reynolds number viscous flow simulations on extremely stretched grids are investigated. One approach consists of employing a semi-coarsening or directional-coarsening technique, based on the directions of strong coupling within the mesh, in order to construct more optimal coarse grid levels. An alternate approach...
متن کاملAutomatic coarsening of three dimensional anisotropic unstructured meshes for multigrid applications
This paper describes an algorithm designed for the automatic coarsening of three-dimensional unstructured simplicial meshes. This algorithm can handle very anisotropic meshes like the ones typically used to capture the boundary layers in CFD with Low Reynolds turbulence modeling that can have aspect ratio as high as 10. It is based on the concept of mesh generation governed by metrics and on th...
متن کاملMultigrid Techniques for Unstructured Meshes
An overview of current multigrid techniques for unstructured meshes is given. The basic principles of the multigrid approach are first outlined. Application of these principles to unstructured mesh problems is then described, illustrating various different approaches, and giving examples of practical applications. Advanced multigrid topics, such as the use of algebraic multigrid methods, and th...
متن کاملGreedy Coarsening Strategies for Nonsymmetric Problems
The solution of large-scale linear systems in computational science and engineering requires efficient solvers and preconditioners. Often the most effective such techniques are those based on multilevel splittings of the problem. In this paper, we consider the problem of partitioning non-symmetric matrices based solely on algebraic criteria. A new algorithm is proposed that combines attractive ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: SIAM Journal on Scientific Computing
سال: 1998
ISSN: 1064-8275,1095-7197
DOI: 10.1137/s1064827595287638