Lattice Boltzmann Method를 활용한 3차원 날개의 압축성 유동해석 및 풍동시험 결과 비교

Abstract

In this study, aerodynamic analyses for several wind-tunnel test models in compressible flow were validated using the lattice Boltzmann method(LBM), and the numerical results were compared with experimental data. The primary objective of this study is to evaluate the numerical accuracy and potential limitations of a meshless, particle-based methodology implemented in XFlow software, which features an efficient octree mesh generator capable of handling complex geometries with ease. It is demonstrated that achieving reasonable numerical results by using LBM requires a critical particle resolution level. However, the greatest challenge in practical computational fluid dynamics(CFD) analysis using LBM is determining the appropriate number of particles needed to obtain reliable results. To address this, inviscid and viscous flow analyses for several experimental wing models were conducted using different Element Resolution Ratios(ERR). The findings presented in this paper provide valuable insights into determining the appropriate level of ERR for accurate flow analysis of three-dimensional wing shapes using LBM.