Numerical Study of a Moving Object in Calm Water Using Overset and Non-overset Grids

摘要

In this paper, a numerical solver for naval architecture and oceanengineering named naoe-FOAM-SJTU solver, which is developedusing OpenFOAM, is applied to conduct the simulation of a specialobject moving in calm water. The main part of the object goes forwardunder the free surface of water, whereas a slender rod of the objectstretches out of the water. To better simulate the situation, this researchuse two different girds. One is the traditional non-overset grids, and theother is overset grids. Results of both grids are compared in regard offorces, wave patterns and velocities. The object moves at two differentspeeds (5kn and 6kn), while the moving direction, which is named as xdirection,is always parallel to the free surface of water. The similaritiesand differences of the result calculated out by the two grids arediscussed. This paper also discusses the influence of moving speed onthe wave pattern, resistance and velocity field.