Two-layer approximate boundary conditions for large-eddy simulations

Balaras, Elias; Benocci, C.; Piomelli, Ugo

doi:10.2514/3.13200

Cited by 324 publications

(94 citation statements)

References 23 publications

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“…Craft et al, 2004) to improve the prediction of the wall shear stress by solving an ODE in the wall-normal direction inside an inner layer sufficiently close to the wall. The first one to actually solve the momentum equation 1as a wall-stress-model, with all terms retained (i.e., solving the full boundary layer PDEs), was Balaras et al (1996). This removes the assumption of a perfect balance between convection and the pressure-gradient, which should enable the capturing of at least some non-equilibrium effects.…”

Section: Wall-stress-modelsmentioning

confidence: 99%

Large eddy simulation with modeled wall-stress: recent progress and future directions

Larsson

Kawai

Bodart

et al. 2016

Mechanical Engineering Reviews

380

231

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The paper provides a brief introduction to the near-wall problem of LES and how it can be solved through modeling of the near-wall turbulence. The distinctions and key differences between different approaches are emphasized, both in terms of fidelity (LES, wall-modeled LES, and DES) and in terms of different wall-modeled LES approaches (hybrid LES/RANS and wall-stress-models). The focus is on approaches that model the wall-stress directly, i.e., methods for which the LES equations are formally solved all the way down to the wall. Progress over the last decade is reviewed, and the most important and promising directions for future research are discussed.

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Section: Wall-stress-modelsmentioning

confidence: 99%

Large eddy simulation with modeled wall-stress: recent progress and future directions

Larsson

Kawai

Bodart

et al. 2016

Mechanical Engineering Reviews

380

231

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show abstract

“…Many examples of such zonal models exist. [12][13][14][15][16] The one-dimensional turbulence model (ODT) can also be considered a zonal model. [17][18][19][20] The detached eddy simulation method is a hybrid, combining LES away from the wall with RANS near the wall on the same grid but typically using severe grid refinement in the wall-normal direction.…”

Section: Introductionmentioning

confidence: 99%

Integral wall model for large eddy simulations of wall-bounded turbulent flows

et al. 2015

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A new approach for wall modeling in Large-Eddy-Simulations (LES) is proposed and tested in various applications. To properly include near-wall physics while preserving the basic economy of equilibrium-type wall models, we adopt the classical integral method of von Karman and Pohlhausen (VKP). A velocity profile with various parameters is proposed as an alternative to numerical integration of the boundary layer equations in the near-wall zone. The profile contains a viscous or roughness sublayer and a logarithmic layer with an additional linear term that can account for inertial and pressure gradient effects. Similar to the VKP method, the assumed velocity profile coefficients are determined from appropriate matching conditions and physical constraints. The proposed integral wall-modeled LES (iWMLES) method is tested in the context of a pseudo-spectral code for fully developed channel flow with a dynamic Lagrangian subgrid model as well as in a finite-difference LES code including the immersed boundary method and the dynamic Vreman eddy-viscosity model. Test cases include a fully developed half-channel at various Reynolds numbers, a fully developed channel flow with unresolved roughness, a standard developing turbulent boundary layer flows over smooth plates at various Reynolds numbers, over plates with unresolved roughness, and a case with resolved roughness elements consisting of an array of wall-mounted cubes. The comparisons with data show that the proposed iWMLES method provides accurate predictions of near-wall velocity profiles in LES while, similarly to equilibrium wall models, its cost remains independent of Reynolds number and is thus significantly lower compared to existing zonal or hybrid wall models. A sample application to flow over a surface with truncated cones (representing idealized barnacle-like roughness elements) is also presented, which illustrates effects of subgrid scale roughness when combined with resolved roughness elements. C 2015 AIP Publishing LLC. [http://dx.

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“…In the wall-stress modeling approach, [8][9][10] the LES is formally defined as extending all the way down to the wall but is solved on a grid that only resolves the outer layer motions. A wallmodel takes as input the instantaneous LES solution at a height y ¼ h wm above the wall and estimates the instantaneous shear stress s w at the wall y ¼ 0; this is then given back to the LES as a boundary condition.…”

Section: Introductionmentioning

confidence: 99%

Wall-modeling in large eddy simulation: Length scales, grid resolution, and accuracy

2012

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This paper addresses one of the most persistent errors in wall-modeled large eddy simulation: the inevitable presence of numerical and subgrid modeling errors in the first few grid points off the wall, which leads to the so-called “log-layer mismatch” with its associated 10-15% error in the predicted skin friction. By considering the behavior of turbulence length scales near a wall, the source of these errors is analyzed, and a method that allows for the log-layer mismatch to be removed, thereby yielding accurately predicted skin friction, is proposed.

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Two-layer approximate boundary conditions for large-eddy simulations

Cited by 324 publications

References 23 publications

Large eddy simulation with modeled wall-stress: recent progress and future directions

Large eddy simulation with modeled wall-stress: recent progress and future directions

Integral wall model for large eddy simulations of wall-bounded turbulent flows

Wall-modeling in large eddy simulation: Length scales, grid resolution, and accuracy

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