CHINESE JOURNAL OF COMPUTATIONAL PHYSICS ›› 2020, Vol. 37 ›› Issue (1): 46-54.DOI: 10.19596/j.cnki.1001-246x.8007

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DDES for Separated Transitional Flows Based on B-C Transition Model

YU Qiuyang1, BAO Yun1, WANG Shengye2, WANG Guangxue2,3   

  1. 1. School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou, Guangdong 510006, China;
    2. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan 410073, China;
    3. School of Physics, Sun Yat-sen University, Guangzhou, Guangdong 510006, China
  • Received:2018-11-15 Revised:2019-01-25 Online:2020-01-25 Published:2020-01-25

Abstract: Empirical correlations in B-C transition model were calibrated with experimental values of zero pressure gradient plates. Calibrated B-C transition model predicts reasonably transition positions with low inlet turbulence intensity. However, due to limitations of RANS method, B-C transition model’s accuracy diminishes for massively separated flows. A turbulence closure named transitional Delayed Detached-Eddy Simulation (BC-DDES) method is proposed which combines traditional SA-DDES method and B-C transition model. This method has the potential for accurately capturing massively separated boundary layers in transitional Reynolds number range. Numerical simulation of three-dimensional S-K flat plate shows that BC-DDES method obtains transition prediction consistent with baseline transition model. Comparisons are evaluated on circular cylinder in crossflow. It shows that pressure distribution and drag coefficient of cylinder calculated with BC-DDES method agree well with experimental data, with less computational costs than tHRLES method.

Key words: transition model, calibration, detached-eddy simulation, BC-DDES, massively separated flow

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