Computations of Flows and Acoustic Wave Emitted from Moving Body by ALE Formulation in Finite Difference Lattice Boltzmann Model

J. Ocean Eng. Technol. 2006;20(1):48-54.

KANG HO-KEUN;

Institute of marine Industry, Gyeongsang National University;

차분격자볼츠만법에 ALE모델을 적용한 이동물체 주위의 흐름 및 유동소음의 수치모사

강호근;

경상대학교 해양산업연구소;

Keywords: Finite Difference Lattice Boltzmann Method (FDLBM), Arbitrary lagrangian Eulerian Formulation ALE, Acoustic Wave, Moving Body

핵심용어: 차분격자볼츠만법, 방법, 음파, 이동물체

Abstract

In this paper, flowfield and acoustic-field around moving bodies are simulated by the Arbitrary Lagrangian Eulerian (ALE) formulation in the finite difference lattice Boltzmann method. Some effects are checked by comparing flaw about a square cylinder in ALE formulation and that in the fixed coordinates, and both agree very well. Matching procedure between the moving grid and fixed grid is also considered. The applied method in which the both grids are connected through buffer region is shown to be superior to moving overlapped grid. Dipole-like emissions of sound wave from harmonically vibrating bodies in two- and three-dimensional cases are simulated.