Flow and turbulent structures around simplified car models

Aljure, D.E.; Lehmkuhl, O.; Rodríguez, I.; Oliva, A.

doi:10.1016/j.compfluid.2014.03.013

Cited by 78 publications

(60 citation statements)

References 19 publications

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“…The methodology for solving the governing equations has been previously used with accurate results for solving the flow over bluff bodies with massive separation by means Forces on a circular cylinder at critical Reynolds of both DNS 22,35,36 and LES techniques 28,37 . In this methodology, the governing equations have been discretized on a collocated unstructured grid arrangement by means of secondorder spectra-consistent schemes 38 .…”

Section: B Numerical Methodsmentioning

confidence: 99%

Unsteady forces on a circular cylinder at critical Reynolds numbers

Lehmkuhl

Rodríguez

Borrell³

et al. 2014

Physics of Fluids

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Section: B Numerical Methodsmentioning

confidence: 99%

Unsteady forces on a circular cylinder at critical Reynolds numbers

Lehmkuhl

Rodríguez

Borrell³

et al. 2014

Physics of Fluids

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“…However, simulations with the QR model have produced mixed results. [15][16][17] Previous research suggests that the mixed results of the QR model are due to an incorrect model constant. 18 In this paper, it is demonstrated that the QR model produces good results on isotropic grids if the model constant is corrected.…”

Section: Introductionmentioning

confidence: 99%

Minimum-dissipation models for large-eddy simulation

et al. 2015

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Minimum-dissipation eddy-viscosity models are a class of sub-filter models for large-eddy simulation that give the minimum eddy dissipation required to dissipate the energy of sub-filter scales. A previously derived minimum-dissipation model is the QR model. This model is based on the invariants of the resolved rate-of-strain tensor and has many desirable properties. It appropriately switches off for laminar and transitional flows, has low computational complexity, and is consistent with the exact sub-filter tensor on isotropic grids. However, the QR model proposed in the literature gives insufficient eddy dissipation. It is demonstrated that this can be corrected by increasing the model constant. The corrected QR model gives good results in simulations of decaying grid turbulence on an isotropic grid. On anisotropic grids the QR model is not consistent with the exact sub-filter tensor and requires an approximation of the filter width. It is demonstrated that the results of the QR model on anisotropic grids are primarily determined by the used filter width approximation, and that no approximation gives satisfactory results in simulations of both a temporal mixing layer and turbulent channel flow. A new minimum-dissipation model for anisotropic grids is proposed. This anisotropic minimum-dissipation (AMD) model generalizes the desirable practical and theoretical properties of the QR model to anisotropic grids and does not require an approximation of the filter width. The AMD model is successfully applied in simulations of decaying grid turbulence on an isotropic grid and in simulations of a temporal mixing layer and turbulent channel flow on anisotropic grids.

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“…On the other hand, on figure 7, the same numerical results obtained with the coarse (with and without wall model) are compared with results obtained by using a finer mesh of 1 × 10 6 CV [13]. This plot allows us to evaluate the performance of the wall model by comparing the results between two cases with identical meshes but with different wall treatment, and another case that uses a much finer mesh but without wall model.…”

Section: The Ahmed Car Test Resultsmentioning

confidence: 99%

A dynamic wall model for Large-Eddy simulations of wind turbine dedicated airfoils

Calafell¹,

Lehmkuhl²,

Carmona³

et al. 2014

J. Phys.: Conf. Ser.

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Abstract. This work aims at modelling the flow behavior past a wind turbine dedicated airfoil at high Reynolds number and large angle of attack (AoA). The DU-93-W-210 airfoil has been selected. To do this, Large Eddy Simulations (LES) have been performed. Momentum equations have been solved with a parallel unstructured symmetry preserving formulation while the wall-adapting local-eddy viscosity model within a variational multi-scale framework (VMS-WALE) is used as the subgrid-scales model. Since LES calculations are still very expensive at high Reynolds Number, specially at the near-wall region, a dynamic wall model has been implemented in order to overcome this limitation. The model has been validated with a very unresolved Channel Flow case at Reτ = 2000. Afterwards, the model is also tested with the Ahmed Car case, that from the flow physics point of view is more similar to an stalled airfoil than the Channel Flow is, including flow features as boundary layer detachment and recirculations. This case has been selected because experimental results of mean velocity profiles are available. Finally, a flow around a DU-93-W-210 airfoil is computed at Re = 3 × 10 6 and with an AoA of 15• . Numerical results are presented in comparison with Direct Numerical Simulation (DNS) or experimental data for all cases.

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Flow and turbulent structures around simplified car models

Cited by 78 publications

References 19 publications

Unsteady forces on a circular cylinder at critical Reynolds numbers

Unsteady forces on a circular cylinder at critical Reynolds numbers

Minimum-dissipation models for large-eddy simulation

A dynamic wall model for Large-Eddy simulations of wind turbine dedicated airfoils

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