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High-resolution simulations of a turbulent boundary layer impacting two obstacles in tandem

Journal Article · · Physical Review Fluids (Online)
 [1];  [2];  [3];  [4];  [2];  [5]
  1. Johannes Kepler University, Linz (Austria); Parallel Works Inc.
  2. Universitat Politècnica de València (Spain)
  3. Parallel Works, Chicago, IL (United States)
  4. Universidad Politècnica de Madrid (Spain)
  5. KTH Royal Institute of Technology, Stockholm (Sweden)
High-fidelity large-eddy simulations of the flow around two rectangular obstacles are carried out at a Reynolds number of 10 000 based on the freestream velocity and the obstacle height. The incoming flow is a developed turbulent boundary layer. Mean-velocity components, turbulence fluctuations, and the terms of the turbulent-kinetic-energy budget are analyzed for three flow regimes: skimming flow, wake interference, and isolated roughness. Three regions are identified where the flow undergoes the most significant changes: the first obstacle’s wake, the region in front of the second obstacle, and the region around the second obstacle. In the skimming-flow case, turbulence activity in the cavity between the obstacles is limited and mainly occurs in a small region in front of the second obstacle. In the wake-interference case, there is a strong interaction between the freestream flow that penetrates the cavity and the wake of the first obstacle. Furthermore, this interaction results in more intense turbulent fluctuations between the obstacles. In the isolated-roughness case, the wake of the first obstacle is in good agreement with that of an isolated obstacle. Separation bubbles with strong turbulent fluctuations appear around the second obstacle.
Research Organization:
Parallel Works Inc., Chicago, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
SC0019695
OSTI ID:
2310254
Alternate ID(s):
OSTI ID: 1994420
Journal Information:
Physical Review Fluids (Online), Journal Name: Physical Review Fluids (Online) Journal Issue: 6 Vol. 8; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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