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Unsteady Computational Fluid Dynamics in AeronauticsTurbulence and Its Modelling

Unsteady Computational Fluid Dynamics in Aeronautics: Turbulence and Its Modelling [Averaging procedures used to form the Unsteady Reynolds Averaged Navier-Stokes (URANS) and Large Eddy Simulation (LES) equations are outlined. Also, turbulence modelling hierarchies for unsteady flows are presented. These range from URANS to DNS (Direct Numerical Simulation). The grid requirements for different approaches are also discussed. The LES models that are used for results in later chapters are given, along with details of others. Different types of LES filters are outlined. Their potential strong impact on results is discussed. A hierarchy of key elements for industrial LES is proposed. Notably, for flows without transition, the actual explicit LES model comes low down. More the key element is the numerical schemes discussed in Chap. 3. Key hybrid RANS-LES approaches are given. The advantages and disadvantages of these are outlined. The discussion shows that considerable expertise is needed to safely use hybrid RANS-LES techniques. Hence, the need for best practice guidelines is proposed. Methods for generating turbulence inflow are outlined. It is shown that many of these have limited applicability to complex engineering systems and so suitable strategies proposed.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Unsteady Computational Fluid Dynamics in AeronauticsTurbulence and Its Modelling

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Publisher
Springer Netherlands
Copyright
© Springer Science+Business Media Dordrecht 2014
ISBN
978-94-007-7048-5
Pages
93 –148
DOI
10.1007/978-94-007-7049-2_3
Publisher site
See Chapter on Publisher Site

Abstract

[Averaging procedures used to form the Unsteady Reynolds Averaged Navier-Stokes (URANS) and Large Eddy Simulation (LES) equations are outlined. Also, turbulence modelling hierarchies for unsteady flows are presented. These range from URANS to DNS (Direct Numerical Simulation). The grid requirements for different approaches are also discussed. The LES models that are used for results in later chapters are given, along with details of others. Different types of LES filters are outlined. Their potential strong impact on results is discussed. A hierarchy of key elements for industrial LES is proposed. Notably, for flows without transition, the actual explicit LES model comes low down. More the key element is the numerical schemes discussed in Chap. 3. Key hybrid RANS-LES approaches are given. The advantages and disadvantages of these are outlined. The discussion shows that considerable expertise is needed to safely use hybrid RANS-LES techniques. Hence, the need for best practice guidelines is proposed. Methods for generating turbulence inflow are outlined. It is shown that many of these have limited applicability to complex engineering systems and so suitable strategies proposed.]

Published: Jun 4, 2013

Keywords: LES; DNS; MILES; ILES; DES; Hybrid LES-RANS; Inflow conditions; Synthetic turbulence; Filter

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