Applications of three-dimensional front tracking to multi phase fluid.

摘要

We make improvements for the 3d front tracking method. First, we apply a 3 component grid based reconstruction method to solve the moving surface-solid wall interaction problem. A moving contact curve on the wall is explicitly tracked. A drop falling problem is studied by the new algorithm. Secondly, we present an improved, robust, locally grid based method for reconstruction of tangled interfaces. This method improves the handling of topological change of the surface mesh in the 3D simulations. The primary breakup of a high speed jet is studied numerically in 3D using the front tracking method. The breakup in the liquid jet is presented in the simulations. The nozzle flow is also studied to determine the cavitation within the nozzle and the level of turbulence occurring at the nozzle exit. The turbulence intensity from the simulations is compared with experimental and theoretical results. We also apply 3D simulations to the hydrodynamic and MHD processes in a liquid mercury target for the Muon Collider/Neutrino Factory, which include a mercury jet interacting with protons in a longitudinal magnetic field. Surface instabilities are observed in the simulations. The stabilizing effect of magnetic field on the growth of filaments are observed. The growth of filaments are compared with experimental results.