抄録
Fluid flow analysis using MPS (Moving Particle Semi-implicit) method was carried out, and its applicability to mold filling problems was reviewed. Dam break problem, which is a representative benchmark problem for free surface flow, was firstly calculated. As a result, calculation instability occurs when detached free surface particles move too close to each other, generating unnatural pressure and velocity between them. Therefore, potential force between particles (PF) and velocity correction method (VC) were introduced. As a result, calculation stability was improved and calculation could be continued without failing. In addition, unnatural velocity decay known to occur with the MPS method is also improved, by weighted potential force depending on the average velocity of surrounding particles. Finally, mold filling into a thin-tilted plate was calculated, and the results were compared with those obtained by FDM (Finite Difference Method). As a result, FDM can calculate stably but unreal flow patterns are generated due to stair-step boundary appearance at the tilted plane. Calculation using conventional MPS fails immediately after it is started, whereas calculation with the proposed methods is stable and proper results can be obtained.
