Wall-modeled large eddy simulation in an unstructured mesh environment
Abstract/Contents
- Abstract
- The present study aims at developing and validating a wall-layer model for large eddy simulation of complex turbulent flows at high Reynolds number. To be applicable to complex flows over/inside the complex geometries, a non-equilibrium wall-model based on unsteady three-dimensional Reynolds-averaged Navier-Stokes equations has been implemented in an unstructured mesh environment. This method is similar to that of the wall-model for structured mesh investigated in earlier studies, but it is supplemented by a new dynamic eddy viscosity/conductivity model that corrects the effect of the resolved Reynolds stress (resolved turbulent heat flux) on the skin friction (wall heat flux). This correction is shown to be crucial in predicting the correct level of skin friction. Unlike earlier models, this eddy viscosity/conductivity model does not have a stress-matching procedure or a tunable free parameter, and it shows consistent performance over a wide range of Reynolds numbers. The wall-model is first validated against canonical (attached) transitional and fully turbulent flows at moderate to very high Reynolds numbers. Application to a separated flow over a NACA4412 airfoil operating close to maximum lift is also considered to test the performance of the wall-model in complex non-equilibrium flows. Lastly, the capability of wall-modeled large-eddy simulation for prediction of wall-pressure fluctuations is demonstrated in terms of rms fluctuation, wavenumber-frequency spectra, and two-point correlations in the turbulent channel flow.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2014 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Park, George Ilhwan |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Moin, Parviz |
| Thesis advisor | Moin, Parviz |
| Thesis advisor | Iaccarino, Gianluca |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Advisor | Iaccarino, Gianluca |
| Advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | George Ilhwan Park. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2014. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2014 by George Ilhwan Park
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