拡散界面モデルに基づく二相流計算法の表面張力流れ問題への適用(数値計算(2),一般講演)

概要

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A computational fluid dynamics method adopting a diffuse-interface model (DIM) is applied to interface-tracking simulation of microscopic incompressible two-phase flows with high density ratio on a solid surface. The DIM is based on the free-energy approach. In the flows, the physical properties vary steeply but continuously across a finite volumetric zone, which is assumed as a fluid-fluid interface between the phases. The wettability of a solid surface is taken into account through a simple boundary condition derived from the increase in free energy on the surface. The DIM approach simplifies the capture of motions of a fluid interface on the surface (contact line). The method solves a set of the Navier-Stokes equations and an advection equation for the fluid volume and the diffusive interface. The numerical results of two- or three-dimensional static and dynamic contact-line problems prove that the DIM-based method can be employed for simulating capillarity-driven microscopic two-phase flows.
日本流体力学会の論文
2008-09-04