Analyses of Urans and Les Capabilities to Predict Vortex Shedding for Rods and Turbines

Ferrand, Pascal; Boudet, Jérôme; Caro, Joëlle; Aubert, Stéphane; Rambeau, C.

doi:10.1007/1-4020-4605-7_28

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…17) is overestimated as compared with the experimental value of 0.2 [1]. The same observation is made by Ferrand et al [10] with similar URANS Fig. 15 Velocity field in the centre plane for the two URANS models, using two different discharges at t ¼ 100 s simulations.…”

Section: Implication For Fish Resting Zonesupporting

confidence: 79%

“…For Q ¼ 10 L/s the wake is almost steady, which might be explained by the low waterdepth and therefore by the influence of the bed. For the same Reynolds number, Ferrand et al [10] showed that URANS simulations are able to reproduce the von Karman vortex street. to find out whether the oscillation can be related to this phenomenon, the lateral velocity at the centreline and X=D ¼ 2 is treated with a Welch's method plus Hanning window.…”

Section: Implication For Fish Resting Zonementioning

confidence: 99%

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Flow and drag force around a free surface piercing cylinder for environmental applications

et al. 2017

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This paper investigates flows around a free surface piercing cylinder with Froude number F [ 0.5 and Reynolds number around Re = 50,000. The aim of this work is to gain a better understanding of the flow behaviour in environmental systems such as fishways. The advances are based upon experimental and numerical results. Several flow discharges and slopes are tested to obtain both subcritical and supercritical flows. The drag force exerted on the cylinder is measured with the help of a torque gauge while the velocity field is obtained using particle velocimetry. For the numerical part, two URANS turbulence models are tested, the k-x SST and the RNG k-e models using the OpenFOAM software suite for subcritical cases, and then compared with the corresponding experimental results. With fishways applications in mind, the changes in drag coefficient C d versus Froude number and water depth are studied and experimental correlations proposed. We conclude that the most suitable URANS turbulence model for reproducing this kind of flow is the k-x SST model.

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Section: Implication For Fish Resting Zonesupporting

confidence: 79%

Section: Implication For Fish Resting Zonementioning

confidence: 99%

Flow and drag force around a free surface piercing cylinder for environmental applications

et al. 2017

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“…Despite all of the inherent deficiencies of RANS described above, it is the only practical choice for the numerical simulation of separated vortical flows in engineering. At present there are some encouraging progresses for URANS approach [1][2][3]. It is well known that a significant development in the turbulence modeling theory since the 1990s is the nonlinear eddy viscosity turbulence model (NLEVM), which is essentially equivalent to the explicit algebraic stress model (EASM).…”

mentioning

confidence: 97%

Applications of URANS on predicting unsteady turbulent separated flows

2009

Acta Mech Sin

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Accurate prediction of unsteady separated turbulent flows remains one of the toughest tasks and a practical challenge for turbulence modeling. In this paper, a 2D flow past a circular cylinder at Reynolds number 3,900 is numerically investigated by using the technique of unsteady RANS (URANS). Some typical linear and nonlinear eddy viscosity turbulence models (LEVM and NLEVM) and a quadratic explicit algebraic stress model (EASM) are evaluated. Numerical results have shown that a high-performance cubic NLEVM, such as CLS, are superior to the others in simulating turbulent separated flows with unsteady vortex shedding.

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The impact of periodical flow forcing on the mixing quality and flow structure in a swirl burner: numerical and experimental studies

Lacarelle¹,

Oevermann²,

Paschereit³

2011

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Analyses of Urans and Les Capabilities to Predict Vortex Shedding for Rods and Turbines

Cited by 4 publications

References 12 publications

Flow and drag force around a free surface piercing cylinder for environmental applications

Flow and drag force around a free surface piercing cylinder for environmental applications

Applications of URANS on predicting unsteady turbulent separated flows

The impact of periodical flow forcing on the mixing quality and flow structure in a swirl burner: numerical and experimental studies

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