| 摘要 |
PROBLEM TO BE SOLVED: To heighten accuracy of analysis, to shorten a calculation time, and to prevent system-down, when predicting engine performance by performing CFD operation analysis of a flow of engine suction/exhaust or the like. SOLUTION: Concerning simulation wherein a boundary condition is given from a simulation result by one-dimensional CFD operation in the whole flow of suction/exhaust and three-dimensional CFD operation is performed relative to a part of the flow, in the case of steady operation simulation, the one-dimensional CFD operation is performed beforehand under an operation condition, and a divergence time zone of calculation is specified in the three-dimensional CFD operation from the result. The three-dimensional CFD operation condition is mitigated only in the divergence time zone in the middle of the simulation. A calculation condition is mitigated by the optimum method set corresponding to the simulation operation condition in each model. In the case of simulation for unsteady operation, it is estimated that calculation diverges in the three-dimensional CFD operation performed in parallel from the result of the one-dimensional CFD operation in the middle of the simulation, and the calculation condition is mitigated by the estimation result. COPYRIGHT: (C)2005,JPO&NCIPI
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