Wall-modeled large eddy simulation of laminar and turbulent separated flows

F. Cadieux, J. Sadique, Xiang Yang, R. Mittal, C. Meneveau

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The capability of the recently proposed integral wall model for large eddy simulation (iWMLES) to capture flow separation, transition, and reattachment is investigated by means of flow over a flat plate with a suction and blowing boundary condition. Wall-resolving LES can accurately recover time-averaged DNS results for a laminar separation bubble, but are limited to moderate Reynolds numbers due to the strong requirement of resolving the boundary layer. Typical equilibrium wall-models do not take pressure gradients into account, and many hybrid RANS-LES either rely on the equilibrium assumption or require very fine mesh spacing in the wall-normal direction. iWMLES addresses these deficiencies through the addition of non-equilibrium terms in an integral version of the momentum equation. iWMLES of a laminar separation bubble flow confirm that the wall-model can capture flow separation, transition, and reattachment at Reδ = 105 on a coarse grid. Good qualitative agreement with a wall-resolved LES of a turbulent separation bubble is obtained using iWMLES on a coarser wall-normal grid. Trends in both mean and RMS velocities as well as the coefficient of pressure are well predicted by the iWMLES.

Original languageEnglish (US)
Title of host publication46th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104367
StatePublished - Jan 1 2016
Event46th AIAA Fluid Dynamics Conference, 2016 - Washington, United States
Duration: Jun 13 2016Jun 17 2016

Publication series

Name46th AIAA Fluid Dynamics Conference

Other

Other46th AIAA Fluid Dynamics Conference, 2016
CountryUnited States
CityWashington
Period6/13/166/17/16

Fingerprint

Large eddy simulation
Turbulent flow
Flow separation
Blow molding
Pressure gradient
Momentum
Boundary layers
Reynolds number
Boundary conditions

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Aerospace Engineering

Cite this

Cadieux, F., Sadique, J., Yang, X., Mittal, R., & Meneveau, C. (2016). Wall-modeled large eddy simulation of laminar and turbulent separated flows. In 46th AIAA Fluid Dynamics Conference (46th AIAA Fluid Dynamics Conference). American Institute of Aeronautics and Astronautics Inc, AIAA.
Cadieux, F. ; Sadique, J. ; Yang, Xiang ; Mittal, R. ; Meneveau, C. / Wall-modeled large eddy simulation of laminar and turbulent separated flows. 46th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, 2016. (46th AIAA Fluid Dynamics Conference).
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Cadieux, F, Sadique, J, Yang, X, Mittal, R & Meneveau, C 2016, Wall-modeled large eddy simulation of laminar and turbulent separated flows. in 46th AIAA Fluid Dynamics Conference. 46th AIAA Fluid Dynamics Conference, American Institute of Aeronautics and Astronautics Inc, AIAA, 46th AIAA Fluid Dynamics Conference, 2016, Washington, United States, 6/13/16.

Wall-modeled large eddy simulation of laminar and turbulent separated flows. / Cadieux, F.; Sadique, J.; Yang, Xiang; Mittal, R.; Meneveau, C.

46th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA, 2016. (46th AIAA Fluid Dynamics Conference).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - The capability of the recently proposed integral wall model for large eddy simulation (iWMLES) to capture flow separation, transition, and reattachment is investigated by means of flow over a flat plate with a suction and blowing boundary condition. Wall-resolving LES can accurately recover time-averaged DNS results for a laminar separation bubble, but are limited to moderate Reynolds numbers due to the strong requirement of resolving the boundary layer. Typical equilibrium wall-models do not take pressure gradients into account, and many hybrid RANS-LES either rely on the equilibrium assumption or require very fine mesh spacing in the wall-normal direction. iWMLES addresses these deficiencies through the addition of non-equilibrium terms in an integral version of the momentum equation. iWMLES of a laminar separation bubble flow confirm that the wall-model can capture flow separation, transition, and reattachment at Reδ = 105 on a coarse grid. Good qualitative agreement with a wall-resolved LES of a turbulent separation bubble is obtained using iWMLES on a coarser wall-normal grid. Trends in both mean and RMS velocities as well as the coefficient of pressure are well predicted by the iWMLES.

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Cadieux F, Sadique J, Yang X, Mittal R, Meneveau C. Wall-modeled large eddy simulation of laminar and turbulent separated flows. In 46th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics Inc, AIAA. 2016. (46th AIAA Fluid Dynamics Conference).