Hybrid RANS-LES methods are gaining popularity for the simulation of the complex bluff body flows at high Reynolds numbers due to their reduced computational cost and good accuracy. A number of such methods have been proposed in the literature. Each of these methods have enjoyed varying degree of success for different applications. One of the most important parameter which determines the switching between near-wall RANS region and off-body LES region is the length scale parameter. This parameter can be grid based or physics based and numerous choices exist for defining this parameter. This study proposes to investigate the effect of this parameter on the size of the RANS and LES regions and also on the solution accuracy. Four test problems are chosen covering attached, mildly separated and massively separated flow regimes. Results will help us to identify length scale definitions to be used for different flow scenarios.
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ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2016
Busan, South Korea
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4993-4
PROCEEDINGS PAPER
Verification of Length Scale Effects on Solution Accuracy of Hybrid RANS-LES Methods Available to Purchase
Gaurav Kumar,
Gaurav Kumar
Indian Institute of Technology Kanpur, Kanpur, India
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Dominic Chandar,
Dominic Chandar
IHPC, Singapore, Singapore
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Vinh-Tan Nguyen,
Vinh-Tan Nguyen
IHPC, Singapore, Singapore
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Ashoke De
Ashoke De
Indian Institute of Technology Kanpur, Kanpur, India
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Gaurav Kumar
Indian Institute of Technology Kanpur, Kanpur, India
Harish Gopalan
IHPC, Singapore, Singapore
Dominic Chandar
IHPC, Singapore, Singapore
Vinh-Tan Nguyen
IHPC, Singapore, Singapore
Ashoke De
Indian Institute of Technology Kanpur, Kanpur, India
Paper No:
OMAE2016-54008, V002T08A002; 10 pages
Published Online:
October 18, 2016
Citation
Kumar, G, Gopalan, H, Chandar, D, Nguyen, V, & De, A. "Verification of Length Scale Effects on Solution Accuracy of Hybrid RANS-LES Methods." Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. Volume 2: CFD and VIV. Busan, South Korea. June 19–24, 2016. V002T08A002. ASME. https://doi.org/10.1115/OMAE2016-54008
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