Computational fluid dynamics, with the aid of the supercomputer development are becoming in the matured stage both for the physical research problems and the practical engineering problems. Currently, a method handling complex body configurations and increasing the accuracy of simulations are two of the important topics in the CFD research, In the present paper, a new zonal method is proposed to solve both these problems. The method is an extension of the FSA (fortified solution algorithm for generality, originally called FNS, fortified Navier-Stokes) zonal method that the present author proposed in the past to improve the local accuracy of the flow field to be simulated. The FSA concept is used as an interface strategy and both overset and slightly overlapped zonal methods can be treated in a similar manner. The multi-block method can also be incorporated. Implementation of this idea into the existing explicit and implicit codes are easy and the treatment of complex body configurations and the improvement of local grid resolutions become enabled with a slight modification of existing conventional program codes. The idea may be considered to fall into the category of the Chimera method, but it has some advantages. The test case and some of the applications are given. They indicate that the present unified zonal method can be an effective CFD analytical tool for complex flow physics and complex body configurations. (C) 1995 Academic Press, inc. [References: 21]
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