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A Procedure to Establish Inflow Conditions for LES of Spatially Developing Turbulent Boundary Layers

[+] Author Affiliations
Kunlun Liu, Richard H. Pletcher

Iowa State University, Ames, IA

Paper No. HT-FED2004-56606, pp. 1091-1099; 9 pages
doi:10.1115/HT-FED2004-56606
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 2, Parts A and B
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4691-1 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

Inlet conditions have a dramatic effect on numerical simulations of turbulent boundary layers due to the strong convective characteristic of flows with a displacement thickness Reynolds number as high as 2000. The fluid structures present in the inlet flow will be transported downstream, but some information may be modified or lost during this transport process. This numerical receptivity phenomenon may reduce the performance of numerical calculations and increase the difficulty in establishing the downstream turbulence. The interaction between the inlet conditions and the numerical scheme may generate an inlet buffer zone adjacent to the inlet. This buffer zone costs in terms of CPU resources. The purpose of this paper is to present an inlet condition generator to achieve very good downstream profiles and reduce the extent of the buffer zone. In this method, the recycle plane is dynamically selected according to the downstream instantaneous field. Different adjustment methods are applied to the inner, outer and free stream part based on their different similarity laws. With this inlet generation technique, the inlet buffer zone is very thin. The numerical results compare well with current experiments and DNS results.

Copyright © 2004 by ASME

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