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Unified RANS-LES Simulations of Turbulent Swirling Jets and Channel Flows

  • Stefan HeinzEmail author
  • Michael K. Stöllinger
  • Harish Gopalan
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 130)

Abstract

The accurate and efficient simulation of both attached and separated flows represents a huge challenge. RANS methods suffer from the lack of ability to simulate instantaneous turbulence structures, and LES methods are computationally very expensive regarding the simulation of wall-bounded flows, which have to be considered very often. A promising alternative is the use of hybrid RANS-LES methods, but existing hybrid methods like DES face many questions. The paper focuses on the use of unified RANS-LES methods implied by stochastic analysis as an alternative to using existing hybrid RANS-LES methods. The theoretical basis of the approach applied and applications to turbulent channel flows and turbulent swirling jet flows will be presented. The accuracy and cost features of the unified RANS-LES model will be discussed in comparison with other (in particular DES) hybrid methods.

Keywords

Large Eddy Simulation Vortex Breakdown Turbulent Channel Flow Detach Eddy Simulation Swirl Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was partially sponsored by the Air Force Office of Scientific Research, USAF, under grant number FA9550-05-1-0485 monitored by Dr. John Schmisseur. We would also like to acknowledge support through NASA’s NRA research opportunities in aeronautics program (Grant No. NNX12AJ71A) with Dr. P. Balakumar as the technical officer. The computational resources have been provided by the UW Institute for Scientific Computation.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Stefan Heinz
    • 1
    Email author
  • Michael K. Stöllinger
    • 2
  • Harish Gopalan
    • 3
  1. 1.Department of MathematicsUniversity of WyomingLaramieUSA
  2. 2.Mechanical Engineering DepartmentUniversity of WyomingLaramieUSA
  3. 3.Mechanical EngineeringUnion CollegeSchenectadyUSA

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