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Nonlinear features ...
Nonlinear features in explicit algebraic models for turbulent flows with active scalars
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- Lazeroms, Werner (författare)
- KTH,Linné Flow Center, FLOW
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- Brethouwer, Gert (författare)
- KTH,Mekanik,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre
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- Wallin, Stefan (författare)
- KTH,Turbulens,Linné Flow Center, FLOW
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visa fler...
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- Johansson, Arne V., 1953- (författare)
- KTH,Mekanik,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre
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visa färre...
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(creator_code:org_t)
- TSFP-9, 2015
- 2015
- Engelska.
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Ingår i: 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. - : TSFP-9. - 9780000000002
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- A detailed discussion of explicit algebraic turbulence models in the case of active scalars is given. In particular, we discuss the appearance of nonlinearities in the models and the need for explicit solutions of the resulting nonlinear equations. Focussing on a recently published model for two-dimensional stratified flows, we present an intuitive way of approximating the solution of a sixth-order polynomial equation for the production-to-dissipation ratio (p + g)/e of turbulent kinetic energy K. This formulation is shown to be consistent for turbulent channel flow with stable and unstable stratification. The result is important for obtaining a robust model with a correct behaviour of the turbulence production in different limits of shear and buoyancy. The results have recently been published in Lazeroms et al. (2015).
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Algebra
- Channel flow
- Control nonlinearities
- Kinetic energy
- Kinetics
- Nonlinear equations
- Polynomials
- Thermal stratification
- Turbulence models
- Dissipation ratio
- Explicit algebraic models
- Explicit solutions
- Nonlinear features
- Order polynomials
- Turbulence productions
- Turbulent channel flows
- Turbulent kinetic energy
- Shear flow
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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