导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (12): 3605-3614.doi: 10.7527/S1000-6893.2016.0175

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Detached eddy simulation based on adaptive hybrid grids

ZHANG Yang1,3, ZHANG Laiping1,2, HE Xin1,2, DENG Xiaogang4   

  1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    3. Low Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    4. National University of Defense Technology, Changsha 410073, China
  • Received:2016-01-18 Revised:2016-06-02 Online:2016-12-15 Published:2016-06-14
  • Supported by:

    National Natural Science Foundation of China (11532016); National Key Technology Research and Development Program (2016YFB0200700)

Abstract:

An adaptive mesh technique with isotropic refining/coarsening approach based on CFD general notation system (CGNS) data structure is presented and implemented for hybrid grids. In order to simplify the possible refinement cases, elements with hanging nodes are changed into polyhedron and meanwhile the compatibility of the grid is maintained, so flow solvers that allow polyhedrons can operate on the adapted meshes without any modifications. Then, detached eddy simulation (DES) method combined with the grid adaptation technique is applied to simulate the flow over a 65° sweep delta wing at high angle of attack. The comparison of the DES results on initial grid and adaptive grid, as well as the experimental data, is carried out. The numerical results demonstrate that with the use of the adaptive technique the spatial resolution in the leeward side of the delta wing can be improved effectively due to the increment of cell number in some local region and the capability of present DES solver to resolve the small scale turbulent flow structure is effectively enhanced, consequently the issue of resolution is alleviated in DES simulation based on hybrid grid with a commonly used second-order scheme.

Key words: grid self-adaptive, detached eddy simulation, unstructured grid, hybrid grid, delta wing, finite-volume method

CLC Number: