Journal
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
Volume 94, Issue 8, Pages 1111-1154Publisher
WILEY
DOI: 10.1002/fld.5085
Keywords
cumulant lattice Boltzmann method; GPU computing; lattice Boltzmann; separated shear flows; turbulent boundary layer; turbulent flow
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Funding
- Projekt DEAL
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The article assesses a cumulant lattice Boltzmann method in wall-bounded, separated turbulent shear flows. The approach successfully resolves complex turbulent flows without the need for ad hoc modeling by using a recently published parameterized cumulant collision operator. The evaluation focuses on the flow over a periodic hill and determines the required minimum resolution.
The article is concerned with the assessment of a cumulant lattice Boltzmann method in wall-bounded, separated turbulent shear flows. The approach is of interest for its resolution-spanning success in turbulent channel flows without using a specific turbulence treatment. The assessment focuses upon the flow over a periodic hill, which offers a rich basis of numerical and experimental data, for Reynolds numbers within 700 <= Re <= 37,000. The analysis involves the mean flow field, second moments and their invariants, as well as spectral data obtained for a wide range of resolutions with 2 less than or similar to Delta xi+less than or similar to 100. With the emphasis on a recently published parameterized cumulant collision operator, the universality of the value assigned to a stability preserving regularization parameter is assessed. Reported results guide resolution-dependent optimized values and indicate a required minimum resolution of Delta xi+approximate to 30. Analog to the findings for attached turbulent shear flows, the approach appears to adequately resolve complex turbulent flows without the need for ad hoc modeling for a range of scale resolving resolutions.
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