Extension of the algebraic transition model for the wall roughness effect

Straka, Petr; Příhoda, Jaromír

doi:10.1051/epjconf/201611402114

Cited by 3 publications

(8 citation statements)

References 23 publications

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“…The mathematical model is based on the Favre-averaged Navier-Stokes equations closed by the EARSM model according to Hellsten [14] and by the algebraic transition model proposed by Straka and Příhoda [8]. The algebraic relation for the anisotropy tensor a ij is used in the connection with twoequation k-/k- turbulence model according to Menter [15].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Tu    (8) proposed by Mayle [4]. The effect of wall roughness on the transition onset was expressed by the correlation   (9) However experimental data of Jonáš et al [20] and Pinson and Wang [21] show that the wall roughness influences the transition even for k s +  5.…”

Section: Rementioning

confidence: 99%

“…1. The algebraic transition model is described in detail by Straka and Příhoda [8]. According to Boyle and Stripf [6], the correlation for the transition length was not modified for roughness effects.…”

Section: Rementioning

confidence: 99%

“…Boyle and Stripf [6] and Langtry and Menter [7]). The correlation of Boyle and Stripf [6] was modified for low values of roughness height by Straka and Příhoda [8]. All current relations were proposed for the various types of distributed wall roughness covering the whole surface.…”

Section: Introductionmentioning

confidence: 99%

“…This model was modified by Langel et al [12,13] and applied for the simulation of the flow around wind turbine profiles with insect impact on the leading edge. The presented paper deals with the further modification of the algebraic transition model proposed by Straka and Příhoda [8] for modelling of the wall roughness effect. This simple modification allows taking into account the effect of the rough strip on the transition as well.…”

Section: Introductionmentioning

confidence: 99%

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Modification of the Algebraic Transition Model for Wall Roughness Effect Including a Rough Strip

Straka¹,

Příhoda²

2020

Topical Problems of Fluid Mechanics 2020

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The contribution deals with the simulation of the laminar/turbulent transition on a rough wall. The algebraic transition model taking into account wall roughness according to Straka and Příhoda [8] was further extended for the effect of short rough strip near the leading edge. The proposed correlation was tested by means of incompressible flow over a flat plate covered by sand paper and around the NACA 0012 airfoil with a rough strip near the leading edge. The agreement with experiments is appropriate nevertheless the applicability of the correlation is limited due to the lack of relevant experimental results.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Rementioning

confidence: 99%

Section: Rementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modification of the Algebraic Transition Model for Wall Roughness Effect Including a Rough Strip

Straka¹,

Příhoda²

2020

Topical Problems of Fluid Mechanics 2020

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Unsteady pressure measurement and numerical simulations in an end-wall region of a linear blade cascade

et al. 2021

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This contribution describes experimental and numerical research of an unsteady behaviour of a flow in an end-wall region of a linear nozzle cascade. Effects of compressibility ($$M_\mathrm {2,is}$$ M 2 , is ) and inlet flow angle ($$\alpha _1$$ α 1 ) were investigated. Reynolds number ($$Re_\mathrm {2,is}$$ R e 2 , is $$=8.5\times 10^5$$ = 8.5 × 10 5 ) was held constant for all tested cases. Unsteady pressure measurement was performed at the blade mid-span in the identical position $${\mathfrak {s}}$$ s to obtain reference data. Surface flow visualizations were performed as well as the steady pressure measurement to support conclusions obtained from the unsteady measurements. Comparison of the surface Mach number distributions obtained from the experiments and from the numerical simulations are presented. Flow visualizations are then compared with calculated limiting streamlines on the blade suction surface. It was shown, that the flow structures in the end-wall region were not affected by the primary flow at the blade mid-span, even when the shock wave formed. This conclusion was made from the experimental, numerical, steady as well as unsteady points of view. Three significant frequencies in the power spectra suggested that there was a periodical interaction between the vortex structures in the end-wall region. Based on the data analyses, anisotropic turbulence was observed in the cascade.

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MODELLING OF THE LAMINAR/TURBULENT TRANSITION ON A HEATED FLAT PLATE USING THE k-k<sub>L</sub>-ω MODEL

Kožíšek¹,

Fürst²,

Příhoda³

2016

Topical Problems of Fluid Mechanics 2016

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The contribution deals with the numerical simulation of the transition to turbulence on a heated flat plate by means of the k-k L- model of Walters and Cokljat (2008). The revised version of the three-equation model was implemented into the OpenFOAM code for the incompressible and compressible flows. Numerical simulations of the boundary-layer development were carried out according to measurements of Sohn and Reshotko (1991). The transition model was tested by means of the skin friction and the Stanton number distributions for various free-stream turbulence levels. Results were compared with empirical correlations expressing the Reynolds analogy according to Kays and Crawford (1993) and with experimental data of Pinson and Wang (2000).

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Extension of the algebraic transition model for the wall roughness effect

Cited by 3 publications

References 23 publications

Modification of the Algebraic Transition Model for Wall Roughness Effect Including a Rough Strip

Modification of the Algebraic Transition Model for Wall Roughness Effect Including a Rough Strip

Unsteady pressure measurement and numerical simulations in an end-wall region of a linear blade cascade

MODELLING OF THE LAMINAR/TURBULENT TRANSITION ON A HEATED FLAT PLATE USING THE k-k<sub>L</sub>-ω MODEL

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