An Implicit LES Approach Based on High-order Compact Differencing and Filtering Schemes (Invited)

Visbal, Miguel R.; Morgan, Philip E.; Rizzetta, Donald P.

doi:10.2514/6.2003-4098

Cited by 203 publications

(70 citation statements)

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“…The computational time step is 2 ·10 −4 in nondimensional time to obtain a maximum CourantFriedrichsLewy (CFL) number less than 2 for the controlled cases, which is determined by the previous studies using LES for turbulent boundary layer [10,18]. Using these methods, an implicit LES (ILES) approach [17,19] is adopted. In the ILES approach, unlike the standard LES approach, no additional stress and heat §ux are appended to the SGS models.…”

Section: Methodsmentioning

confidence: 99%

The effects of actuation frequency on the separation control over an airfoil using a synthetic jet

Okada

Nonomura

et al. 2015

Progress in Flight Physics – Volume 7

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The simulation of separation control using a synthetic jet (SJ) is conducted around an NACA (National Advisory Committee for Aeronautics) 0015 airfoil by large-eddy simulation (LES) with a compact difference scheme. The synthetic jet is installed at the leading edge of the airfoil and the e¨ects of an actuation frequency F + (normalized by chord length and velocity of freestream) are observed. The lift-drag coe©cient is recovered the most for F + = 6. The relationship between momentum addition by turbulent mixing and large vortex structures is investigated using a phase-averaging procedure based on F + . The Reynolds shear stress is decomposed into periodic and turbulent components where the turbulent components are found to be dominant on the airfoil. The strong turbulent components appear near the large vortex structures that are observed in phase-and span-averaged §ow ¦elds.

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Section: Methodsmentioning

confidence: 99%

The effects of actuation frequency on the separation control over an airfoil using a synthetic jet

Okada

Nonomura

et al. 2015

Progress in Flight Physics – Volume 7

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“…The specific term Implicit Large-Eddy Simulation (ILES) was originally used by Visbal,61,62 to describe a specific method which utilized both implicit high-order central-finite-differencing and filtering schemes. It was shown that dissipation was being added only in the high spatial wave number regime, where the solution began to exhibit a lack of resolution.…”

Section: Subgrid Modelingmentioning

confidence: 99%

Large-Eddy Simulation: Current Capabilities, Recommended Practices, and Future Research

2010

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“…The effect of SGS motions is taken into account implicitly in the high-wavenumber range thanks to the smooth truncations of the filter and finite-difference schemes in the wavenumber space. That is why Visbal et al [31] include this kind of approaches in the implicit LES (ILES) category. In the following, the strategy is referred to as RT (for Regularization Term).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Subgrid-scale Viscosity Models and Selective Filtering Strategy for Large-eddy Simulations

Aubard

Volpiani

Gloerfelt

et al. 2013

Flow Turbulence Combust

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract Explicitly filtered large-eddy simulations (LES), combining high-accuracy schemes with the use of a selective filtering without adding an explicit subgrid-scales (SGS) model, are carried out for the Taylor-Green-vortex and the supersonic-boundary-layer cases. First, the present approach is validated against direct numerical simulation (DNS) results. Subsequently, several SGS models are implemented in order to investigate if they can improve the initial filter-based methodology. It is shown that the most accurate results are obtained when the filtering is used alone as an implicit model, and for a minimal cost. Moreover, the tests for the Taylor-Green vortex indicate that the discretization error from the numerical methods, notably the dissipation error from the high-order filtering, can have a greater influence than the SGS models.

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An Implicit LES Approach Based on High-order Compact Differencing and Filtering Schemes (Invited)

Cited by 203 publications

References 0 publications

The effects of actuation frequency on the separation control over an airfoil using a synthetic jet

The effects of actuation frequency on the separation control over an airfoil using a synthetic jet

Large-Eddy Simulation: Current Capabilities, Recommended Practices, and Future Research

Comparison of Subgrid-scale Viscosity Models and Selective Filtering Strategy for Large-eddy Simulations

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