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Development and Validation of a Compressible Large-Eddy Simulation Code With Overset Mesh Method

[+] Author Affiliations
Atsushi Tateishi, Toshinori Watanabe, Takehiro Himeno

University of Tokyo, Tokyo, Japan

Paper No. GT2017-64195, pp. V02BT41A031; 13 pages
doi:10.1115/GT2017-64195
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 2B: Turbomachinery
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5079-4
  • Copyright © 2017 by ASME

abstract

This paper describes basic ideas for the design of a new computational fluid dynamics (CFD) code for large-eddy simulation (LES), as well as presenting fundamental validation and demonstration cases. The developed code combines highorder structured solver with overset mesh technique, which enables to control mesh density easily with keeping high mesh quality. The validations were conducted over two different flow regimes. The mesh size criteria for the present code were identified from the systematic mesh study of wall-bounded channel flow. In addition, the wake profile after the circular cylinder as a validation of free shear flow showed good agreement with the reference data. Then the validated code was applied to the flow field of highly loaded stator vane. The developed solver reproduced the position of separation bubble accurately however, the velocity profiles on the vane needed improvement by introducing free stream turbulence. From the sequence of validation and application studies, it was concluded that the present code can be used for the researches of fundamental turbulent flow field in turbomachinery.

Copyright © 2017 by ASME

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