G503 有限差分法を用いた流れ解析によるオイルダンパの減衰特性の解明(2)(GS-5 数値シミュレーション,一般セッション)

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The purpose of this work is to know the fluid flow of an oil damper by numerical simulation, so as to obtain the exact values of the damping coefficient of the oil damper. The Finite Difference Method (FDM) was used for solving the flow formation caused by the moving piston. Each time step proceeded in the Fractional Step method, and the Arbitrary Lagarangian-Eulerian (ALE) method was used for the moving boundary. In order to stabilize the computation in the moving boundary problem, we employed the masking method with single block grid system. That is, the algebraic grid generation using stretching function was used for moving piston. The time dependent coordinate system in physical domain which coincides with a contour of moving boundary is transformed into a fixed rectangular coordinate system in computational domain. The computational result was compared with the experimental one and the approximate solution. The results of present analysis show good agreement with the experimental results of wide range of piston diameter.
2006-10-28