A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES
Attempts to mitigate the computational cost of fully resolved large-eddy simulation (LES) in the near-wall region include both the hybrid Reynolds-averaged Navier–Stokes/LES (HRL) and wall-modeled LES (WMLES) approaches. This paper presents an LES wall treatment method that combines key attributes o...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | Entropy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1099-4300/26/12/1095 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846104707158769664 |
|---|---|
| author | Michael Tullis D. Keith Walters |
| author_facet | Michael Tullis D. Keith Walters |
| author_sort | Michael Tullis |
| collection | DOAJ |
| description | Attempts to mitigate the computational cost of fully resolved large-eddy simulation (LES) in the near-wall region include both the hybrid Reynolds-averaged Navier–Stokes/LES (HRL) and wall-modeled LES (WMLES) approaches. This paper presents an LES wall treatment method that combines key attributes of the two, in which the boundary layer mesh is sized in the streamwise and spanwise directions comparable to WMLES, and the wall-normal mesh is comparable to a RANS simulation without wall functions. A mixing length model is used to prescribe an eddy viscosity in the near-wall region, with the mixing length scale limited based on local mesh size. The RANS and LES regions are smoothly blended using the dynamic hybrid RANS-LES (DHRL) framework. The results are presented for the turbulent channel flow at two Reynolds numbers, and comparison to the DNS results shows that the mean and fluctuating quantities are reasonably well predicted with no apparent log-layer mismatch. A detailed near-wall meshing strategy for the proposed method is presented, and estimates indicate that it can be implemented with approximately twice the number of grid points as traditional WMLES, while avoiding the difficulties associated with analytical or numerical wall functions and modified wall boundary conditions. |
| format | Article |
| id | doaj-art-541e86a8074a4b028471b6ae2d276ec0 |
| institution | Kabale University |
| issn | 1099-4300 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj-art-541e86a8074a4b028471b6ae2d276ec02024-12-27T14:25:11ZengMDPI AGEntropy1099-43002024-12-012612109510.3390/e26121095A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LESMichael Tullis0D. Keith Walters1Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701, USADepartment of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701, USAAttempts to mitigate the computational cost of fully resolved large-eddy simulation (LES) in the near-wall region include both the hybrid Reynolds-averaged Navier–Stokes/LES (HRL) and wall-modeled LES (WMLES) approaches. This paper presents an LES wall treatment method that combines key attributes of the two, in which the boundary layer mesh is sized in the streamwise and spanwise directions comparable to WMLES, and the wall-normal mesh is comparable to a RANS simulation without wall functions. A mixing length model is used to prescribe an eddy viscosity in the near-wall region, with the mixing length scale limited based on local mesh size. The RANS and LES regions are smoothly blended using the dynamic hybrid RANS-LES (DHRL) framework. The results are presented for the turbulent channel flow at two Reynolds numbers, and comparison to the DNS results shows that the mean and fluctuating quantities are reasonably well predicted with no apparent log-layer mismatch. A detailed near-wall meshing strategy for the proposed method is presented, and estimates indicate that it can be implemented with approximately twice the number of grid points as traditional WMLES, while avoiding the difficulties associated with analytical or numerical wall functions and modified wall boundary conditions.https://www.mdpi.com/1099-4300/26/12/1095computational fluid dynamicsboundary layerturbulencelarge-eddy simulationwall modeling |
| spellingShingle | Michael Tullis D. Keith Walters A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES Entropy computational fluid dynamics boundary layer turbulence large-eddy simulation wall modeling |
| title | A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES |
| title_full | A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES |
| title_fullStr | A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES |
| title_full_unstemmed | A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES |
| title_short | A Near-Wall Methodology for Large-Eddy Simulation Based on Dynamic Hybrid RANS-LES |
| title_sort | near wall methodology for large eddy simulation based on dynamic hybrid rans les |
| topic | computational fluid dynamics boundary layer turbulence large-eddy simulation wall modeling |
| url | https://www.mdpi.com/1099-4300/26/12/1095 |
| work_keys_str_mv | AT michaeltullis anearwallmethodologyforlargeeddysimulationbasedondynamichybridransles AT dkeithwalters anearwallmethodologyforlargeeddysimulationbasedondynamichybridransles AT michaeltullis nearwallmethodologyforlargeeddysimulationbasedondynamichybridransles AT dkeithwalters nearwallmethodologyforlargeeddysimulationbasedondynamichybridransles |