Abstract
This chapter investigates some domain decomposition techniques to solve large scale aerodynamics problems on unstructured grids. Where implicit time advancing scheme is used, a large sparse linear system has to be solved at each step. To obtain good scalability and CPU times, a good preconditioner is needed for the parallel iterative solution of these systems. For the widely-used Schwarz technique, this can be achieved by a coarse level operator. Since many of the current coarse operators are difficult to implement on unstructured 2D and 3D meshes, a purely algebraic procedure that only requires the entries of the matrix, has been developed.
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