Abstract
Parallel implicit iterative solution techniques are considered for application to a compressible hypersonic Navier-Stokes solver on unstructured meshes. The construction of parallel preconditioners with quasi-optimal convergence properties with respect to their serial counterpart is a key issue in the design of modern parallel implicit schemes. Two types of non-overlapping preconditioners are presented and compared. The first one is an additive Schwarz preconditioner requiring overlapping of the mesh and the second one is based on a Schur complement formulation. Both are using incomplete LU factorisation at the subdomain level but scale differently. Results are presented for computations on the Cray T3D under the message passing interface MPI.
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