Author(s)

J. M. Brethour

Abstract

For many problems, it is advantageous to maintain a grid which is fixed in space while allowing internal boundaries of the fluid andlor solid regions to move within it. This is appropriate wherever drastic changes in the conformation of these boundaries occur, as the necessity of remeshing is avoided. Mesh generation is also greatly simplified. Various approaches are shown to model the boundary movement of the fluid interface, sediment, solidified fluid, and elastic materials within the fixed grid. The movement of fluid boundaries is accomplished with a variant of the Volume-of-Fluid (VOF) method whereby a quantity representing the amount of fluid in each of the computational cells is advected through the fixed mesh. Erosion and deposition of sediment is computed by means of a sediment scour model; the local rate of erosion is based on the local shear stress present at the packed

Keywords