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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (3): 128694-128694.doi: 10.7527/S1000-6893.2023.28694

• Fluid Mechanics and Flight Mechanics • Previous Articles    

Improvement of shock wave and compressibility effects in SST turbulence model

Hongbo WANG, Yu ZENG(), Dapeng XIONG, Yixin YANG, Mingbo SUN   

  1. Laboratory of Science and Technology on Scramjet,College of Aerospace Science,National University of Defense Technology,Changsha 410073,China
  • Received:2023-03-14 Revised:2023-04-11 Accepted:2023-05-07 Online:2023-05-15 Published:2023-05-12
  • Contact: Yu ZENG E-mail:whbwatch@nudt.edu.cn
  • Supported by:
    National Natural Science Foundation of China(11925207)

Abstract:

Lack of consideration of certain important flow characteristics leads to obvious limitations in supersonic flow description by the standard SST turbulence model developed for incompressible flow. To improve the prediction accuracy of the SST model in complex supersonic flows involved in hypersonic propulsion systems, the shock wave and compressibility effects were introduced based on the flow characteristics. The shock/turbulent boundary layer discriminant function and compressible effect discriminant function were used to locate the region where the model parameters or modeling assumptions of the standard SST model failed, and the turbulence model was improved directionally. Examples of supersonic plate boundary layer flow, supersonic compression corner separation flow, supersonic complex shock train flow in an isolator and HIFiRE-2 supersonic internal flow were used for testing. The results show that the improved model has the same prediction ability as the standard SST model for turbulent boundary layers, but significantly improves the prediction ability of shock-wave involved flows and adverse-pressure-gradient induced separating flows.

Key words: SST, turbulence model, shock wave, compressibility, structure characteristics

CLC Number: