Comparison of Octree and Omni-Tree Cartesian Grid for Civil-Plane High-Lift Model Simulations

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Comparison of Octree and Omni-Tree Cartesian Grid for Civil-Plane High-Lift Model Simulations

Sang, Weimin / Shi, Yu

This comparative study is motivated by recent developments dealing with transport aircraft high-lift aerodynamics. Different than these developments Cartesian grids are used to achieve octree and omni-tree data structure. In this paper, the computation of complex flowfield is carried out using the cell-center finite volume method and dual-time stepping scheme. Based on the normal momentum equation a curvature-corrected symmetry technique has been developed to build the wall boundary treatment. A face-to-face algorithm is used in combination with the multizone technique, which can precisely establish the information exchange of flowfields in the interfaces among different zones. Compared with wind-tunnel experiments the above methods have been verified with two test cases involving, respectively, a takeoff configuration and a landing configuration. The focus is on the comparison of the octree and omni-tree data structure in Cartesian grid generation. The computed results indicate preliminarily that the omni-tree data structure is of higher efficiency, allows Cartesian grids to be adapted in an arbitrary manner, and offers the potential of a dramatic reduction of the total number of grids with the solution accuracy almost unaffected.