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Turbulence intensities in large-eddy simulation of wall-bounded flows
H J Bae1,2, A Lozano-Durán1, S T Bose2,3
1Center for Turbulence Research, Stanford University, Stanford, California 94305, USA.
Physical Review Fluids
|October 22, 2019
Summary
Large-eddy simulations (LES) often mispredict near-wall turbulence. A new slip boundary condition improves predictions of velocity fluctuations, offering consistent results across resolutions.
Area of Science:
- Fluid dynamics
- Computational turbulence modeling
Background:
- Wall-bounded large-eddy simulations (LES) with Dirichlet no-slip conditions overpredict streamwise velocity fluctuations and underpredict wall-normal and spanwise fluctuations, especially in underresolved near-wall regions.
- Wall-modeled LES improves predictions but turbulence intensity peaks remain sensitive to grid resolution.
Purpose of the Study:
- To provide a physical explanation for the prediction inaccuracies in near-wall turbulence in LES.
- To introduce and validate a modified boundary condition for improved turbulence intensity prediction.
Main Methods:
- Physical analysis of near-wall streak behavior in LES.
- Implementation and testing of a Robin (slip) boundary condition with transpiration.
Main Results:
- The study offers a physical explanation for near-wall turbulence prediction errors in LES.
- Introducing a slip boundary condition with transpiration successfully damps the inner energy production peak.
- This approach mitigates eddy splatting at the wall, relaxing the wall's blocking effect.
Conclusions:
- The slip boundary condition provides accurate and consistent predictions of turbulence intensities in wall-bounded LES.
- This method is robust and performs well regardless of near-wall grid resolution.
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