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Closure modeling in near-wall region of steep resolution variation for partially averaged Navier-Stokes simulations
Texas A&M Univ, Dept Ocean Engn, College Stn, TX 77843 USA..
Texas A&M Univ, Dept Ocean Engn, College Stn, TX 77843 USA..
Gen Motors, Warren, MI 48092 USA..
Convergent Sci, Madison, WI 53719 USA..
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2022 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 7, no 4, article id 044608Article in journal (Refereed) Published
Abstract [en]

We seek to develop a closure model to enable scale-resolving simulation (SRS) of a turbulent flow to optimally switchover from a Reynolds-averaged Navier-Stokes (RANS) calculation at the wall to a specified degree of resolution in the wake or free-stream region. The closure model is derived by (i) using the physical principle that the total energy of resolved and unresolved scales should be conserved in the switchover region and (ii) establishing consistency with equilibrium boundary layer scaling of the partially resolved field. The model development is performed in the context of a partially averaged Navier-Stokes (PANS) scale-resolving method by quantifying and modeling the commutation terms resulting from varying resolutions in the wall-normal direction. The resulting wall-modeled PANS (WM-PANS) is used to compute the turbulent channel flow in the Re,. range 180 - 8000. The influence of the RANS-SRS switchover location on the computed flow field is examined. It is then demonstrated that the mean flow is reproduced with reasonable accuracy at modest computational effort without discernible log-layer mismatch even at the highest Reynolds number considered. While the Reynolds stresses are also recovered accurately over most of the flow domain, a noticeable computational transition from RANS to unsteady SRS flow behavior is observed and the underlying physics is examined. Irrespective of the location of computational transition, the unsteady features of the flow away from the wall are well captured. It is demonstrated that the proposed closure is able to inject the appropriate amount of resolved turbulence without the need for artificially generated synthetic turbulence. Overall, WM-PANS presents an accurate and computationally viable option for scale-resolving computations of near-wall high-Reynolds number flows.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 7, no 4, article id 044608
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-313089DOI: 10.1103/PhysRevFluids.7.044608ISI: 000795844400001Scopus ID: 2-s2.0-85129732149OAI: oai:DiVA.org:kth-313089DiVA, id: diva2:1662282
Note

QC 20220531

Available from: 2022-05-31 Created: 2022-05-31 Last updated: 2022-06-25Bibliographically approved

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Wallin, Stefan

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