Implementation of Implicit LU-SGS method with Line-implicit scheme on Stretched Unstructured Grids
(English)Manuscript (preprint) (Other academic)
A first implementation of line-implicit Lower-Upper Symmetric Gauss-Seidel (LU-SGS) in Edge has been considered in this paper for convergenceacceleration on stretched meshes. The motivation comes from the lack of efficiency of the implicit LU-SGS when running in RANS meshes. Edge is a flow solver for unstructured grids based on a dual grid and edge-based formulation. The line-implicit method has been implemented in the code Edge has an acceleration method when computing explicit schemes in stretched meshes. This methods works only in regions of stretched grid where the flow equations are integrated implicitly in time along the structured lines. The combination with an implicit LU-SGS should remove the restriction of the time step for explicit schemes and accelerate the convergence to steady state. The results have shown that for highly stretched meshes, line-implicit LU-SGS could perform much faster than LU-SGS.
IdentifiersURN: urn:nbn:se:kth:diva-98475OAI: oai:DiVA.org:kth-98475DiVA: diva2:537246
QS 20122012-06-262012-06-262012-06-26Bibliographically approved