A Simultaneous Variable Solution Procedure for Laminar and Turbulent Flows in Curved Channels and Bends

Wang, Jianrong; Shirazi, Siamack A.

doi:10.1115/1.1287723

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…Contrary to the mean axial velocity proÿles, di erences exist between the turbulence models for the turbulence characteristics predictions, as already observed by Wang and Shirazi (2000). Those authors have found that, even if no di erences were obtained for mean values, various turbulent kinetic energy proÿles were observed depending on the models retained.…”

Section: • Bend Ow Without Swirl Motionmentioning

confidence: 73%

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Numerical investigation of bend and torus flows, part I : effect of swirl motion on flow structure in U-bend

Pruvost

Legrand

Legentilhomme

2004

Chemical Engineering Science

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As a preliminary study to ow modeling in torus reactors, simulations are carried out in well-known standard geometries, namely 90 • and 180 • bends. For the latter, two ow conÿgurations are considered, with and without initial swirl motion so as to approach torus reactor conditions. E ciency of the commercial CFD code FLUENT is investigated by comparing predicted results with experimental measurements available in the literature for both bended conÿgurations. Di erent turbulent models and near-wall considerations are considered, including k -and high Reynolds-stresses models, with the standard wall-function approach as well as the two-layer zonal model and low-Re k -models.After validation of the numerical strategy, a parametric study is made to better understand the interactions between Dean vortices, involved by the bend curvature, and the main rotating motion generated by the swirl motion. Simulations are achieved for various values of the initial swirl intensity applied at the bend entry. Numerical simulations show di erent ow structures, resulting from the progressive Dean vortices perturbations with the increase of swirl intensity. ?

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Section: • Bend Ow Without Swirl Motionmentioning

confidence: 73%

“…To predict this secondary motion, the ow simulation has to be three-dimensional (Van de Vosse et al, 1989). Wang and Shirazi (2000) have investigated a two-dimensional square-sectioned bend, but the ratio of width to height of the channel was high enough to neglect the e ects of Dean vortices.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of bend and torus flows, part I : effect of swirl motion on flow structure in U-bend

Pruvost

Legrand

Legentilhomme

2004

Chemical Engineering Science

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A CFD Based Correlation for Erosion Factor for Long-Radius Elbows and Bends

Wang

Shirazi

2003

Journal of Energy Resources Technology

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A model for predicting sand erosion in 90 degree elbows and bends has been developed based on computational fluid dynamics (CFD), particle tracking and erosion data. After the flow field was obtained from the flow (CFD) model, particles were introduced into the flow and particle trajectories were computed using a Lagrangian approach. A model was also implemented that accounts for the interaction between the particles and the target material. Based on predicted particle impingement velocities, erosion rates and penetration rates were predicted using the empirical equations for erosion ratio. The predicted penetration rates are compared with available experimental data for several different elbows. The agreement between the predicted penetration rates and the experimental data is good. In addition, based on many predictions and erosion rate results, a new CFD based correlation is developed that can be used for an approximate engineering calculation to account for effects of elbow radius on erosion in long-radius elbows. This equation is for computing the ratio of the wall thickness loss (or the penetration rate) in a long-radius elbow to the penetration rate of a standard (short-radius) elbow. The results from the correlation agree well with the trend of available data in the literature.

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Modified partially averaged Navier–Stokes model for turbulent flow in passages with large curvature

Luo

Liu³

2020

Mod. Phys. Lett. B

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This study presents a partially averaged Navier–Stokes model, MSST PANS, based on a modified SST [Formula: see text] turbulence model to predict turbulent flows with large streamline curvature. The model was validated for turbulent flow in a [Formula: see text] curved rectangular duct (Re = 224,000) to assess the MSST PANS capabilities. The predictions are compared against flow simulations for the same curved rectangular duct using four turbulence models including the standard [Formula: see text] model, SST [Formula: see text] model, [Formula: see text] PANS model and SST [Formula: see text] PANS model. Comparisons among those numerical results and available experimental data show that the MSST PANS model more accurately predicts the velocity components in all three directions, especially in the wall-bounded region than the other models. The study also shows the advantages of the MSST PANS model for predicting the Reynolds stresses, vorticity, and smaller scale turbulent structures in the wall-bounded region not only qualitatively but quantitatively. Furthermore, the MSST PANS model requires fewer computations than the SST PANS model, indicating that this turbulence model, which takes large streamlines curvature effects into consideration, is an effective alternative for capturing the small-scale turbulence flow structures. This turbulence model is expected to be very useful for engineering applications, especially for flows in turbomachinery.

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A Simultaneous Variable Solution Procedure for Laminar and Turbulent Flows in Curved Channels and Bends

Cited by 3 publications

References 12 publications

Numerical investigation of bend and torus flows, part I : effect of swirl motion on flow structure in U-bend

Numerical investigation of bend and torus flows, part I : effect of swirl motion on flow structure in U-bend

A CFD Based Correlation for Erosion Factor for Long-Radius Elbows and Bends

Modified partially averaged Navier–Stokes model for turbulent flow in passages with large curvature

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