오일러리안 무격자법을 이용한 진동하는 2차원 원주주위 점성 유동 해석

Abstract

In this study, a newly developed Eulerian gridless solver for the simulation of a two-dimensional unsteady incompressible viscous flow around a moving body is introduced. A moving domain method based on the Arbitrary Lagrangian Eulerian(ALE) technique is adopted to implement the moving body. The spatial derivatives of the governing equation are solved by weighted moving least square(WMLS) interpolation over the point cloud. The fractional time step method is adopted and the Poisson equation for pressure is solved successively in the WMLS sense. Simulations of flows around a cylinder moving with constant speed and in harmonic motion are solved for validation and the results are compared with experiments and other CFD simulations.<BR> For the constant speed cases, the drag, lift and pressure coefficients estimated by present method were well matched with other results. From the computational results under the harmonic motion with changing main parameters such as Keulegan-Carpenter and Reynolds numbers, the drag and inertial force coefficients using the Fourier series approach were obtained and compared with other results. Even small discrepancy exist, the coefficients were good agreement with other ones.