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This paper concerns a multiblock-parallel computation technique for three-dimensional turbulent flows, which is advantageous to deal with complicated boundary shapes and to improve computational efficiency as well. A computational domain is decomposed into multiple sub-blocks and their geometries are represented by curvilinear coordinates. The multiple blocks are connected on their surfaces withoutoverlap, so that the grids near the shared surfaces can be easily generated even when the three-dimensional connected regions have complex geometries. The spatial interpolation for some of the variables are performed with a cubic spline function, which prevents the first-order numerical error arising between sub-blocks. As a result of the parallel computations for laminar flows with a moving wall and pressure gradients, it was confirmed that the computational speed is about twice when using four workstations with 130, 000 computational nodes.

DEVELOPMENT OF MULTIBLOCK-PARALLEL COMPUTATION METHOD WITH CURVILINEAR COORDINATES AND ITS BASIC FEATURES