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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (4): 126589-126589.doi: 10.7527/S1000-6893.2022.26589

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

A dissipation control method based on amplitude and wavenumber

Huangsheng WEI, Zhu HUANG, Guang XI()   

  1. School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China
  • Received:2021-10-29 Revised:2021-11-15 Accepted:2022-01-05 Online:2022-01-12 Published:2022-01-11
  • Contact: Guang XI E-mail:xiguang@xjtu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(51790512)

Abstract:

The shock capture scheme can adaptively control the dissipation according to the smoothness of the local flow field to suppress the small-scale non-physical fluctuations and resolve large-scale flow structures. In order to better identify the small-scale non-physical fluctuations produced in the shock capture process, and then more accurately control dissipation, this paper proposes a dissipation control method based on amplitude and wavenumber of the local flow field. For problems with strong unsteadiness, such as shock-dominated or isotropic turbulence problems, according to the one-dimensional unsteady Euler equation, the relationship between different physical quantities at small scales is derived, and the threshold of the small-scale fluctuation amplitude are determined by numerical experiments or Kolmogorov scale theory. Finally, based on Fourier analysis and the threshold of the small-scale fluctuation amplitude, the relationship between the magnitude of the dissipation, and the amplitude and wavenumber of the local flow field is established. In order to obtain the shock-capturing capability, the scheme is hybridized with the TENO(Targeted Essentially Non-Oscillatory) scheme to form a hybrid scheme. A series of benchmark examples involving shocks or turbulence show that this scheme produces small-scale nonphysical fluctuations with lower wavenumbers, smaller amplitudes, and better resolution of large-scale flow structures during computations.

Key words: Kolmogorov scale, compressible flow, isotropic turbulence, dissipation control, shock capture scheme

CLC Number: