Extension of the k-omega-SST turbulence model for flows over rough surfaces

Hellsten, Antti; Laine, Seppo

doi:10.2514/6.1997-3577

Cited by 58 publications

(66 citation statements)

References 8 publications

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“…The first disadvantage is the very fine near-wall mesh resolution required. Both authors Patel and Yoon (1995) and Hellsten (1997) state that for surface roughness much finer near-wall grids are required than for smooth walls. This constraint increases the computational costs for the appropriate usage of this roughness model in terms of numerical error significantly.…”

Section: Introductionmentioning

confidence: 99%

“…Both authors Patel (1998) and Hellsten (1997) consider only the case of a constant Reynolds number (based on the free-stream velocity and the length of the plate) and vary the equivalent sand grain roughness size. Instead, in the present paper the case by Ligrani and Moffat (1986) is considered, in which the roughness height is held constant and the roughness Reynolds number is changed by varying the onflow velocity.…”

Section: Introductionmentioning

confidence: 99%

“…In Patel and Yoon (1995), Patel (1998), some results for velocity profiles and friction factor for pipe flow and few results for fully developed channel flow are shown. Hellsten (1997) uses the roughness extension by Wilcox for two variants of the original Wilcox k-x model, viz., the Menter BSL and the SST k-x model, and he shows some results for boundary layers over flat plates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new extension for k– turbulence models to account for wall roughness

Knopp

Eisfeld

Calvo

2009

International Journal of Heat and Fluid Flow

111

115

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new extension for k– turbulence models to account for wall roughness

Knopp

Eisfeld

Calvo

2009

International Journal of Heat and Fluid Flow

111

115

View full text Add to dashboard Cite

“…SST model 21,22 was chosen for calculations. Domain interface was used for interface between moving and stationary grids.…”

Section: Turbulence Model and Boundary Conditionsmentioning

confidence: 99%

Improvement of hydro-turbine draft tube efficiency using vortex generator

Tian

Pan

Hong

et al. 2015

Advances in Mechanical Engineering

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Computational fluid dynamics simulation was employed in a hydraulic turbine (from inlet tube to draft tube). The calculated turbine efficiencies were compared with measured results, and the relative error is 1.12%. In order to improve the efficiency of the hydraulic turbine, 15 kinds of vortex generators were installed at the vortex development section of the draft tube, and all of them were simulated using the same method. Based on the turbine efficiencies, distribution of streamlines, velocities, and pressures in the draft tube, an optimal draft tube was found, which can increase the efficiency of this hydraulic turbine more than 1.5%. The efficiency of turbine with the optimal draft tube, draft tube with four pairs of middle-sized vortex generator, and draft tube without vortex generator under different heads of turbine (5-14 m) was calculated, and it was verified that these two kinds of draft tubes can increase the efficiency of this turbine in every situation.

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“…The two-equation SST and oneequation Spalart-Allmaras turbulence models were used. Boundary conditions on rough walls were prescribed directly on the wall using the SST model modified to account for wall roughness by Hellsten and Laine (1997) and the SA model modified by Aupoix and Spalart (2003). Turbulence models were tested for the constant pressure turbulent boundary layer on the rough wall formed by commercial abrasive paper and by tightly packed spheres.…”

mentioning

confidence: 99%

Numerical modelling of turbulent flow over rough walls

Louda

Příhoda

Kozel

2007

Proc Appl Math and Mech

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The numerical simulation of turbulent flow over rough walls was carried out for various types of roughness. The mathematical model was based on the Reynolds averaged Navier-Stokes equations for incompressible flow. The two-equation SST and oneequation Spalart-Allmaras turbulence models were used. Boundary conditions on rough walls were prescribed directly on the wall using the SST model modified to account for wall roughness by Hellsten and Laine (1997) and the SA model modified by Aupoix and Spalart (2003). Turbulence models were tested for the constant pressure turbulent boundary layer on the rough wall formed by commercial abrasive paper and by tightly packed spheres. The effect of wall roughness on the decelerated flow over a smoothly contoured ramp with flow separation was investigated. Obtained results were compared with experimental data.

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Extension of the k-omega-SST turbulence model for flows over rough surfaces

Cited by 58 publications

References 8 publications

A new extension for k– turbulence models to account for wall roughness

A new extension for k– turbulence models to account for wall roughness

Improvement of hydro-turbine draft tube efficiency using vortex generator

Numerical modelling of turbulent flow over rough walls

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