Development of Wall Models for LES of Separated Flows

Breuer, M.; Kniazev, Boris; Abel, Markus

doi:10.1007/978-1-4020-5152-2_43

Cited by 2 publications

(4 citation statements)

References 2 publications

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“…However, Breuer et al [42,43] demonstrated that in principle wall models can be derived, which are able to predict separated flows correctly. The wall models VN and PN in the forms w ¼ f VN ðv nor Þṽ tan ands w ¼ f PN ðop=oñÞṽ tan derived by a statistical analysis of a wall-resolved LES prediction [42,43] take the pressure gradient in the wall-normal Table 5 and Fig.…”

Section: Simulation Results On Grid Bmentioning

confidence: 98%

“…The wall models VN and PN in the forms w ¼ f VN ðv nor Þṽ tan ands w ¼ f PN ðop=oñÞṽ tan derived by a statistical analysis of a wall-resolved LES prediction [42,43] take the pressure gradient in the wall-normal Table 5 and Fig. 11), they have an important drawback.…”

Section: Simulation Results On Grid Bmentioning

confidence: 99%

“…To overcome this restriction, Breuer et al [42,43] investigated the dependences of the variable js w j=jṽ tan j on the flow field quantities. The reference data provided by a wallresolved LES of a flow over a periodic arrangement of hills at Re = 10,595 were statistically evaluated and two new wall models in the forms w ¼ f ðv nor Þṽ tan ands w ¼ f ðop=oñÞṽ tan were derived.…”

Section: Introduction and Brief Literature Reviewmentioning

confidence: 99%

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Development of wall models for LES of separated flows using statistical evaluations

2007

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Section: Simulation Results On Grid Bmentioning

confidence: 98%

Section: Simulation Results On Grid Bmentioning

confidence: 99%

Section: Introduction and Brief Literature Reviewmentioning

confidence: 99%

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Development of wall models for LES of separated flows using statistical evaluations

2007

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“…This velocity scale may be more relevant than the friction velocity u for flows under pressure gradient in particular for separated boundary layer for which u becomes zero at a separation or reattachment point. The pressure gradient parameter is defined as in Mellor (1966) and used in Afzal (1996), Skote and Henningson (2002), Breuer et al (2006) and Gungor et al (2016): This parameter is not bounded at a separation or reattachment point since u vanishes. According to Coleman et al (2018) and Maciel et al (2018), none of the near-wall length scales found in the literature are pressure gradient independent and no universal self-similar solution can be expected for boundary layers ranging from quasi-equilibrium to strong adverse pressure gradient turbulent boundary layers.…”

Section: < 40mentioning

confidence: 99%

A New Explicit Algebraic Wall Model for LES of Turbulent Flows Under Adverse Pressure Gradient

Wilhelm

Jacob

Sagaut

2020

Flow Turbulence Combust

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A new explicit algebraic wall law for the Large Eddy Simulation of flows with adverse pressure gradient is proposed. This new wall law, referred as adverse pressure gradient power law (APGPL), is developed starting from the power-law of Werner and Wengle (Turbulent Shear Flows, vol 8, Springer, New York, pp 155-168, 1993) in order to mimic an implicit non-equilibrium log-law based on Afzal's law (Afzal, IUTAM Symposium on Asymptotic Methods for Turbulent Shear Flows at High Reynolds Numbers, Kluwer Academic Publishers, Bochum, pp 1996). No iterative method is needed for the evaluation of the wall shear stress from the APGPL contrary to the majority of models available in the literature. The APGPL model relies on the definition of three modes: the equilibrium power-law is used in regions of no or favourable pressure gradient, the APGPL is used in regions of adverse pressure gradient, and no wall model is used in separated flow regions. This model is assessed via Large Eddy Simulations of flows involving adverse pressure gradient and boundary layer separation using the Lattice Boltzmann Method on uniform nested grids. The flow around a clean and iced NACA23012 airfoil at Reynolds number Re = 1.88 × 10 6 and the flow over the LAGOON landing gear at Re = 1.59 × 10 6 are considered. Results are found in good agreement with those obtained by the non-equilibrium log-law and experimental and numerical data available in the literature.

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Development of Wall Models for LES of Separated Flows

Cited by 2 publications

References 2 publications

Development of wall models for LES of separated flows using statistical evaluations

Development of wall models for LES of separated flows using statistical evaluations

A New Explicit Algebraic Wall Model for LES of Turbulent Flows Under Adverse Pressure Gradient

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