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Verification of Length Scale Effects on Solution Accuracy of Hybrid RANS-LES Methods

[+] Author Affiliations
Gaurav Kumar, Ashoke De

Indian Institute of Technology Kanpur, Kanpur, India

Harish Gopalan, Dominic Chandar, Vinh-Tan Nguyen

IHPC, Singapore, Singapore

Paper No. OMAE2016-54008, pp. V002T08A002; 10 pages
doi:10.1115/OMAE2016-54008
From:
  • ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 2: CFD and VIV
  • Busan, South Korea, June 19–24, 2016
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4993-4
  • Copyright © 2016 by ASME

abstract

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.

Copyright © 2016 by ASME

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