CFD Simulation of Violent Free Surface Flows by a Coupled Level-set and Volume-of-Fluid Method

摘要

A coupled level-set (LS) and volume-of-fluid (VOF) method has beendeveloped for time-domain simulation of violent free surface flowsaround two- and three-dimensional structures. The advection of theVOF function is performed using a mixed second-order Eulerian andLagrangian scheme with a piecewise linear interface calculation(PLIC). A mass correction scheme is implemented to compensate forthe mass change and maintain a divergence-free velocity field. Thelevel-set function is solved using a fifth-order Weighted EssentiallyNon-Oscillatory (WENO) scheme. The coupled level-set and volume offluid (CLSVOF) interface-capturing method is employed inconjunction with the Finite-Analytic Navier-Stokes (FANS) method fortime-domain simulation of violent free surface flow problems.Moreover, a chimera domain decomposition approach is implementedusing an overset grid system including embedding and overlappinggrids for accurate resolution of flow around structures. The simulationsresults demonstrated the capability of the CLSVOF method inmaintaining mass conservation for violent free surface flow problems.