Evaluation of sub grid scale and local wall models in Large-eddy simulations of separated flow
(2015) Second Symposium on OpenFOAM® in Wind Energy In E3S Web of Conferences 5.- Abstract
- 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... (More)
- 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 returned 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/a4f2cb96-ff99-4a1e-981b-7d1c9a158914
- author
- Al Sam, Ali LU ; Szász, Robert-Zoltán LU and Revstedt, Johan LU
- organization
- publishing date
- 2015-10-16
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- 2nd Symposium on OpenFOAM® in Wind Energy
- series title
- E3S Web of Conferences
- editor
- J. Churchfield, Matthew
- volume
- 5
- article number
- 03002
- pages
- 11 pages
- publisher
- EDP Sciences
- conference name
- Second Symposium on OpenFOAM® in Wind Energy
- conference location
- Boulder, Colorado, United States
- conference dates
- 2014-05-19 - 2014-05-21
- external identifiers
-
- scopus:85016417096
- DOI
- 10.1051/e3sconf/20150503002
- language
- English
- LU publication?
- yes
- id
- a4f2cb96-ff99-4a1e-981b-7d1c9a158914
- date added to LUP
- 2016-06-29 13:40:18
- date last changed
- 2022-01-30 04:53:13
@inproceedings{a4f2cb96-ff99-4a1e-981b-7d1c9a158914, abstract = {{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 returned 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.}}, author = {{Al Sam, Ali and Szász, Robert-Zoltán and Revstedt, Johan}}, booktitle = {{2nd Symposium on OpenFOAM® in Wind Energy}}, editor = {{J. Churchfield, Matthew}}, language = {{eng}}, month = {{10}}, publisher = {{EDP Sciences}}, series = {{E3S Web of Conferences}}, title = {{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}}, doi = {{10.1051/e3sconf/20150503002}}, volume = {{5}}, year = {{2015}}, }