Study of Large Eddy Simulation and Smagorinsky Model Using Explicit Filtering

Brandt, Tellervo

doi:10.2514/6.2006-3541

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…However, because no explicit (discrete) filter operator is applied in most PRNS approaches (including the approach advocated in this paper), it is difficult to quantify the commutation errors in the simulation. Even so, there is no definitive evidence that the performance of simulations based on explicit filtering is necessarily better than those based on implicit filtering [3].…”

Section: Prnsmentioning

confidence: 96%

Towards a Unified Turbulence Simulation Approach for Wall-Bounded Flows

Hsieh

Lien

Yee

2009

Flow Turbulence Combust

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A hybrid Reynolds-averaged Navier-Stokes/Large-Eddy Simulation (RANS/LES) methodology has received considerable attention in recent years, especially in its application to wall-bounded flows at high-Reynolds numbers. In the conventional zonal hybrid approach, eddy-viscosity-type RANS and subgrid scale models are applied in the RANS and LES zones, respectively. In contrast, the non-zonal hybrid approach uses only a generalized turbulence model, which provides a unified simulation approach that spans the continuous spectrum of modeling/simulation schemes from RANS to LES. A particular realization of the non-zonal approach, known as partially resolved numerical simulation (PRNS), uses a generalized turbulence model obtained from a rescaling of a conventional RANS model through the introduction of a resolution control function F R , where F R is used to characterize the degree of modeling required to represent the unresolved scales of turbulent motion. A new generalized functional form for F R in PRNS is proposed in this study, and its performance is compared with unsteady RANS (URANS) and LES computations for attached and separated wall-bounded turbulent flows. It is demonstrated that PRNS behaves similarly to LES, but outperforms URANS in general.

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Section: Prnsmentioning

confidence: 96%

Towards a Unified Turbulence Simulation Approach for Wall-Bounded Flows

Hsieh

Lien

Yee

2009

Flow Turbulence Combust

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“…As a consequence, a grid independent LES is achieved. The advantages and disadvantages of both techniques have been exclusively studied [4][5][6][7][8][9] and is beyond the scope of this article. To date implicit filtering has generally been adopted by commercial CFD softwares for industrial problems thanks to its flexibility and simplicity.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Error Estimators for Grid Adaptation in Large Eddy Simulation

Jiang¹,

Nadarajah²

2020

Progress in Canadian Mechanical Engineering. Volume 3

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Mesh adaptation relies on an error estimation process. Error estimators should properly take into consideration the contribution from both numerical and modeling related errors. Numerical dissipation plays an important contribution to the effective modeled turbulent kinetic energy (TKE), and must be accounted for. In the present paper, a novel approach is proposed for the estimation of numerical TKE. Several error estimators for LES are implemented and assessed for grid adaptation. The validation of the periodic hill test case was carried out for the coarse, the fine and the adapted grids. Numerical results are validated through a comparison against reference LES and experimental data. We employ and demonstrate the use of various error estimators for mesh adaptation.

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“…2 and 3, respectively. According to the wall unites describedy by Brandt (2006), the size of the grid cell in wall units is x z + + Δ = Δ =60. Therefore, the grid density is suit for the application of Smagorinsky LES model in fluid field.…”

Section: Numerical Simplification and Setupmentioning

confidence: 99%