Simulation of the Flow in a Ribbed Rotating Duct with a Hybrid k-ω RANS/LES Model

Kubacki, Sławomir; Rokicki, Jacek; Dick, Erik

doi:10.1007/s10494-015-9682-5

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…In Eqs. (2)(3)(4), an overbar represents a variable whose value has been averaged over the filter width. The correlations s ij and q tj are the unknown sub-scale momentum and heat fluxes that require modeling.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Detailed measurements of the isothermal flow in a ribbed rotating channel were reported by Coletti et al [2] who used Particle Image Velocimetry to map the flow field at Re ¼ 15,000 (based on bulk velocity and hydraulic diameter) and for Ro ¼ ±0.3. Borello et al [3] used these measurements to validate their Large-Eddy Simulations while Kubacki et al [4] and Xun and Wang [5] employed them to check models that combined features from conventional Reynolds-averaging (RANS) closures with Large-Eddy Simulations. For the heated case, Mayo et al [6,7] used Liquid Crystal Thermography to map the thermal field at values of Re up to 55,000, and for rotation numbers in the range À1<Ro<1 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large-Eddy Simulations of heated flows in ribbed channels with spanwise rotation

Abdelmoula

Younis

Spring

2018

Numerical Heat Transfer, Part A: Applications

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We report on the outcome of a computational study of heat and momentum transport in a heated ribbed straight channel rotated about a spanwise axis. The flow is of both practical and fundamental interest, the latter due to the simultaneous presence in this flow of a number of complicating effects. These include system rotation, mean-flow unsteadiness, large-scale flow separation, and subsequent reattachment; their interactions severely distort the turbulence structure and thus pose this flow as a challenge to engineering prediction methods. In this study, the predictions were obtained using Large-Eddy Simulations with the objectives of assessing the performance of this approach in this flow, and gaining better understanding of the factors that influence the quality of the solutions. Thus, the numerical accuracy of the simulations was determined using Grid Convergence Index (GCI) method, and additionally by comparing results obtained using discretization schemes of different orders of accuracy. The dependence of the computed results on the models for the sub-grid scale correlations in both the momentum and thermal energy equations was checked by performing computations with alternative closure assumptions. These included the Smagorinsky and the dynamic models for momentum, and both linear and non-linear models for the thermal energy fluxes. The computations, which were performed with OpenFOAM, were compared with benchmark experimental data from both heated and isothermal flows. The correspondence between predictions and measurements was generally satisfactory but some important differences remain. It is argued that these are in part due to ambiguities in the way in which temporal and spatial averages are obtained in the computations and in the measurements.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulations of heated flows in ribbed channels with spanwise rotation

Abdelmoula

Younis

Spring

2018

Numerical Heat Transfer, Part A: Applications

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“…Passive scalar transport has previously been demonstrated for various hybrid models in different applications, including pin matrix [21], ribbed channel [22] and impinging jet flows [23]. Rolfo, Uribe and Billard [24] presented an extension of the blending concept to the SGS turbulent heat flux as an alternative to the Simple Gradient Diffusion Hypothesis and demonstrated superior prediction of the Two Velocity Fields model to conventional LES for passive scalar transport on coarse grids.…”

Section: Introductionmentioning

confidence: 99%

A Dual-Grid Hybrid RANS/LES Model for Under-Resolved Near-Wall Regions and its Application to Heated and Separating Flows

Nguyen

Uribe

Afgan

et al. 2019

Flow Turbulence Combust

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A hybrid RANS/LES model for high Reynolds number wall-bounded flows is presented, in which individual Reynolds-Averaged Navier-Stokes (RANS) and Large Eddy Simulations (LES) are computed in parallel on two fully overlapping grids. The instantaneous, fluctuating subgrid-scale stresses are blended with a statistical eddy viscosity model in regions where the LES grid is too coarse. In the present case, the hybrid model acts as a nearwall correction to the LES, while it retains the fluctuating nature of the flow field. The dual computation enables the LES to be run on isotropic grids with very low wall-normal and wall-parallel resolution, while the auxiliary RANS simulation is conducted on a wallrefined high-aspect ratio grid. Running distinct, progressively corrected simulations allows a clearer separation of the mean and instantaneous flow fields, compliant with the fundamentally dissimilar nature of RANS and LES. Even with the wall-nearest grid point lying far in the logarithmic layer, velocity and temperature predictions of a heated plane channel flow are corrected. For a periodic hill flow, the dual-grid system improves the boundary layer separation and velocity field prediction both for a constant-spaced and a wall-refined LES grid.

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“…Passive scalar transport has previously been demonstrated for various hybrid models in different applications, including pin matrix [14], ribbed channel [23] and impinging jet flows [22]. Rolfo, Uribe and Billard [33] presented an extension of the blending concept to the SGS turbulent heat flux as an alternative to the Simple Gradient Diffusion Hypothesis and demonstrated superior prediction of the Two Velocity Fields model to conventional LES for passive scalar transport on coarse grids.…”

Section: Introductionmentioning

confidence: 99%

A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

Nguyen

Uribe

Afgan

et al. 2018

Proceeding of THMT-18. Turbulence Heat and Mass Transfer 9 Proceedings of the Ninth International Symposium on Turbulence Heat

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Simulation of the Flow in a Ribbed Rotating Duct with a Hybrid k-ω RANS/LES Model

Cited by 6 publications

References 30 publications

Large-Eddy Simulations of heated flows in ribbed channels with spanwise rotation

Large-Eddy Simulations of heated flows in ribbed channels with spanwise rotation

A Dual-Grid Hybrid RANS/LES Model for Under-Resolved Near-Wall Regions and its Application to Heated and Separating Flows

A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

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