画像解析により取得した多孔質体内の粉体・混相流の数値シミュレーション

抄録

This review gives a numerical simulation method for the granular and multiphase flows in realistic porous media. We have developed a method to coordinate the three-dimensional microstructure obtained by scanning a fibrous filter with X-ray computed tomography with computational fluid dynamics simulations. We developed wall boundary models to represent the microstructure with complex shape. The immersed boundary method was used for the existence of solid regions in the fluid. To represent the wettability in the free-interfacial flow, we employed a method based on the phase-field model to set the order parameter in the solid region according to the wettability. The signed distance function constructed by solving the reinitialization equation was used to calculate the contact force with the solid surface in the granular flow. Typical results of the computations with the present numerical simulation methods are present.