3D Steady Turbulent Flow Analysis around a Transport Aircraft Model using Adaptive Mesh Refinement on Hierarchical Cartesian Mesh

Abstract

This paper presents the accuracy improvement of CFD analysis of transonic turbulent flow around a Transport Aircraft Model (NASA Common Research Model, CRM) using hierarchical Cartesian mesh, which is combined with immersed boundary method, wall function, and Solution-Adaptive Mesh Refinement (AMR). When analyzing transonic flow around a CRM, shock wave and wake in the region away from the surface of CRM should be also resolved sufficiently. However, hierarchical Cartesian mesh tends to be coarse in that region, and this can cause insufficient accuracy of analysis. To solve this problem, AMR based on flow field variables is introduced. AMR is applied to the CFD analysis of CRM using hierarchical Cartesian mesh. As a result, the shock wave and wake region are highly resolved, and the accuracy of analysis, especially for pressure drag coefficient, is improved.