Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow
The performance of the Sub Grid Scale models is studied by simulating a separated flow over a wavy channel. The first and second order statistical moments of the resolved velocities obtained by using Large-Eddy simulations at different mesh resolutions are compared with Direct Numerical Simulations...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2015-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/e3sconf/20150503002 |
| _version_ | 1818320978328944640 |
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| author | Sam Ali Al Szasz Robert Revstedt Johan |
| author_facet | Sam Ali Al Szasz Robert Revstedt Johan |
| author_sort | Sam Ali Al |
| collection | DOAJ |
| description | The performance of the Sub Grid Scale models is studied by simulating a separated flow over a wavy channel. The first and second order statistical moments of the resolved velocities obtained by using Large-Eddy simulations at different mesh resolutions are compared with Direct Numerical Simulations data. The effectiveness of modeling the wall stresses by using local log-law is then tested on a relatively coarse grid. The results exhibit a good agreement between highly-resolved Large Eddy Simulations and Direct Numerical Simulations data regardless the Sub Grid Scale models. However, the agreement is less satisfactory with relatively coarse grid without using any wall models and the differences between Sub Grid Scale models are distinguishable. Using local wall model retuned the basic flow topology and reduced significantly the differences between the coarse meshed Large-Eddy Simulations and Direct Numerical Simulations data. The results show that the ability of local wall model to predict the separation zone depends strongly on its implementation way. |
| first_indexed | 2024-12-13T10:33:35Z |
| format | Article |
| id | doaj.art-57d16484c05943e2875512045c50fac9 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-13T10:33:35Z |
| publishDate | 2015-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-57d16484c05943e2875512045c50fac92022-12-21T23:50:47ZengEDP SciencesE3S Web of Conferences2267-12422015-01-0150300210.1051/e3sconf/20150503002e3sconf_sowe2014_03002Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flowSam Ali Al0Szasz Robert1Revstedt Johan2PhD student, Energy Department, Lund UniversityResearcher, Energy Department, Lund UniversityProfessor, Energy Department, Lund UniversityThe performance of the Sub Grid Scale models is studied by simulating a separated flow over a wavy channel. The first and second order statistical moments of the resolved velocities obtained by using Large-Eddy simulations at different mesh resolutions are compared with Direct Numerical Simulations data. The effectiveness of modeling the wall stresses by using local log-law is then tested on a relatively coarse grid. The results exhibit a good agreement between highly-resolved Large Eddy Simulations and Direct Numerical Simulations data regardless the Sub Grid Scale models. However, the agreement is less satisfactory with relatively coarse grid without using any wall models and the differences between Sub Grid Scale models are distinguishable. Using local wall model retuned the basic flow topology and reduced significantly the differences between the coarse meshed Large-Eddy Simulations and Direct Numerical Simulations data. The results show that the ability of local wall model to predict the separation zone depends strongly on its implementation way.http://dx.doi.org/10.1051/e3sconf/20150503002 |
| spellingShingle | Sam Ali Al Szasz Robert Revstedt Johan Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow E3S Web of Conferences |
| title | Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow |
| title_full | Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow |
| title_fullStr | Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow |
| title_full_unstemmed | Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow |
| title_short | Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow |
| title_sort | evaluation of sub grid scale and local wall models in large eddy simulations of separated flow |
| url | http://dx.doi.org/10.1051/e3sconf/20150503002 |
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