상용(ANSYS Fluent)과 오픈소스(OpenFOAM) 전산유체해석 프로그램을 활용한 2상 유동 해석의 정량적 비교

Abstract

This study aims to perform computational fluid dynamics (CFD) simulations in two-phase flows, using a commercial software of ANSYS Fluent (ANSYS), compared with previously obtained results from OpenFOAM [Pham et al. JMST 2020]. We used volume of fluid (VOF) and two-fluid models to solve two-phase flow problems, including 3-D broken dam and single bubble rising cases with two different properties. For an objective comparison, initial condition, boundary condition, physical properties, grid size, and time step were consistently imposed with the previous study by Pham et al. In the broken dam case, ANSYS provides similar results with OpenFOAM and the existing experiment. In a single bubble rising case, numerical results of VOF and the two-fluid models in ANSYS were similar, but center of mass and rising velocity of the bubble were greater than those of OpenFOAM. The bubble sphericity of VOF and two-fluid models in ANSYS was smaller than OpenFOAM after 0.9s at the small surface tension case, whereas sphericity of VOF and two-fluid models in ANSYS was similar with VOF model in OpenFOAM at the large surface tension case.