A 3-D Unstructured Multigrid Navier-Stokes Solver
Joaquim Peiró, A. I. Sayma · 1996
Abstract Unstructured mesh methods have proven to be a useful practical tool for aeronautical design. Currently, the process of mesh generation and computation of inviscid flows past complex configurations such as a full aircraft can be completed in a matter of days. The meshes used for inviscid computations consist, in general, of tetrahedral elements of aspect ratio close to unity [1]. The use of such meshes for the simulation of high Reynolds number flows is computationally unfeasible due to the very small mesh sizes required in the near-wall regions where viscous layers are present. A compromise between economy and accuracy can be achieved by the use of elements that are stretched along the flow direction in those regions. Current mesh generation methods can be used to produce these stretched elements ([2],[4]) but the quality of the generated elements is very difficult to control. An alternative method is the use of an hybrid approach in which the mesh near the solid surfaces is generated by an hyperbolic type mesh generator whilst the region outside the viscous layer is discretized using the conventional approach [5].