Robust calculation of 3D transonic potential flow based on the non-linear FAS multi-grid method and incomplete LU decomposition

Robust calculation of 3D transonic potential flow based on the non-linear FAS multi-grid method and incomplete LU decomposition

van der Wees, A.J.
van der Vooren, J.
Meelker, J.H.

National Aerospace Laboratory NLR

1983-04-18

Two relaxation-algorithms and a number of restriction/prolongation-processes are compared within a non-linear FAS multi-grid research code. Paper focuses on the choice of relaxationalgorithm, which should be fast, robust (stable convergence for all local flow directions) and insensitive (good short wave damping for all possible mesh ratios). A mixed Incomplete Lower Upper decomposition/Strongly Implicit Procedure (ILU/SIP) algorithm appears to fulfill these requirements to a much higher degree than present SLOR algorithms. This new algorithm involves only one free parameter, which can be set once and for all. Numerical results will be presented for a transonic small disturbance equation solved for the flow in "a windtunnel with a bump on the bottom".

http://resolver.tudelft.nl/uuid:9461f160-b67a-41a1-869c-251de3f4a91c

Nationaal Lucht- en Ruimtevaartlaboratorium

Campus only

NLR MP 83019 U

Aerospace Engineering Reports

report

(c) 1983 National Aerospace Laboratory NLR