선체 표면 비정렬 격자와 SnappyHexMesh를 이용한 유동계산

Abstract

Abstract A CAD program has been used to generate a surface data, which is necessary to calculate ship resistance using computational fluid dynamic. In this paper, a surface unstructured-grid is generated using station lines, which are given in a body plan, without using any CAD program. An interpolation method is suggested based on weighting-factors, which are calculated on the basis of sectional area curve, to generate curves between two neighboring station lines. Flow field around the SUBOFF is computed using surfaces of three cases. One surface is generated based on interpolations of station lines. The others are generated using a CAD program. Flow field around the KRISO 3600TEU container ship is computed using surfaces generated based on interpolations of station lines, which are given in a body plan of the ship, and without using the interpolation method. The suggested method is applied to calculate the flow field around a submarine with appendages. The surface triangulations for the hull and the appendages are generated without consideration of each other, then those surface triangulations are simply combined to provide a grid generator with the body boundary. The junctures of the hull and the appendages are identified automatically during the grid generation procedure. Tip vortex is captured, which travels downstream from the tip of the appendages.