Parallel, hybrid KD tree and geometry level set method for simulating ship hydrodynamics using unstructured dynamic overset grid
A parallel, hybrid KD tree search and geometry method is advised for CFD-OHMUGA for calculating close points for level set reinitialization for ship hydrodynamics with motions in unstructured dynamic overset grids.The aim is to resolve the difficulties of keeping accuracy and robust for level set reinitialization in non-orthogonal curvilinear structured grids or unstructured grids.In this method, positions of free surface points are calculated at first, efficient KD tree search is then performed to choose three best free surface points following the constraints of the smallest distance to tagged point and the closest three orthogonal axis created recursively, finally the level set values at close points are calculated from those three points using geometry method.MPI parallel method is also advised to make the process more efficiently by extending the fiction region of the free surface points from other related processors.Unstructured dynamic overset grid solver named Overset-OHMUGA is coupled to solve the problems of complicated geometries,relative body motions, and local grid refinements.Validations show that computational results have good agreements with the experimental data.An example of course keeping is also demonstrated including autopilot, controllers, and 6DOF motions in irregular waves.
Unstructured dynamic overset grid Free surface Level set method Parallel KD tree and geometry method Ship hydrodynamics
HUANG Jun-tao
OHMUGA Fluid Dynamics Inc., St.John”s, NL, Canada, A1A 1Z4
国内会议
合肥
英文
722-732
2019-08-16（万方平台首次上网日期，不代表论文的发表时间）