境界適合座標系による曲がり円管内層流の数値解析

概要

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Three-dimensional laminar flows in various curved pipes # (i. e., R_c/a=2 and 9 for curved 180゜ pipes and R_c/a=2 for curved 90゜ pipes are numerically simulated through use of the full Navier-Stokes equations. The boundary-fitted coordinate system is used in order to treat complicated boundary configurations like a strongly curved pipe. The obtained flow patterns and the magnitude of the secondary flow in the case of R_c/a=9 for a curved 180゜ pipe are in good agreement with the experimental results. The elliptic nature of the basis equation is very important in simulating these recirculating flows, especially in the case of small curvature. Two separation regions, one occurring on the outside wall near the inlet and the other occurring on the inside wall at the outlet, are found in the case of R_c/a=2. Not only is the crossover point between the shear stress maxima on the inside and outside of the pipe independent of the curvature and the bending angle of the pipe, but it is also independent of the initial profile at the straight pipe.
社団法人日本機械学会の論文
1989-10-25