A Comprehensive Study of Improved Delayed Detached Eddy Simulation with Wall Functions

Gritskevich, M. S.; Garbaruk, A. V.; Menter, F. R.

doi:10.1007/s10494-016-9761-2

Cited by 19 publications

(5 citation statements)

References 37 publications

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“…The particular hybrid modeling issues addressed here are those of (1) maintaining consistency between resolved and modeled turbulence, (2) over-reliance on simple eddy viscosity models, (3) ad-hoc RANS to LES blending, and (4) misuse of the RANS transport models. Many of these issues were first identified in Haering et al (2019a) with the exception of the first, which has been reported on extensively elsewhere Shur et al (2008); Riou et al (2009); Gritskevich et al (2017); Piomelli et al (2003).…”

Section: Hybrid Modeling Issuesmentioning

confidence: 99%

Active model split hybrid RANS/LES

Haering¹,

Oliver²,

Moser³

2020

Preprint

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Reliably predictive simulation of complex flows requires a level of model sophistication and robustness exceeding the capabilities of current Reynolds-averaged Navier-Stokes (RANS) models. The necessary capability can often be provided by well-resolved large eddy simulation (LES), but, for many flows of interest, such simulations are too computationally intensive to be performed routinely. In principle, hybrid RANS/LES (HRL) models capable of transitioning through arbitrary levels of modeled and resolved turbulence would ameliorate both RANS deficiencies and LES expense. However, these HRL approaches have led to a host of unique complications, in addition to those already present in RANS and LES. This work proposes a modeling approach aimed at overcoming such challenges. The approach presented here relies on splitting the turbulence model into three distinct components: two responsible for the standard subgrid model roles of either providing the unresolved stress or dissipation and a third which reduces the model length scale by creating resolved turbulence. This formulation renders blending functions unnecessary in HRL. Further, the split-model approach both reduces the physics-approximation burden on simple eddy-viscosity-based models and provides convenient flexibility in model selection. In regions where the resolution is adequate to support additional turbulence, fluctuations are generated at the smallest locally resolved scales of motion. This active forcing drives the system towards a balance between RANS and grid-resolved LES for any combination of resolution and flow while the split-model formulation prevents local disruption to the total stress. The model is demonstrated on fully-developed, incompressible channel flow Lee and Moser (2015) and the periodic hill Breuer et al. (2009), in which it is shown to produce accurate results and avoid common HRL shortcomings, such as model stress depletion.

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Section: Hybrid Modeling Issuesmentioning

confidence: 99%

Active model split hybrid RANS/LES

Haering¹,

Oliver²,

Moser³

2020

Preprint

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“…The turbulence model used in this study is the k ‐ ω ‐shear stress transport (SST)‐improved delayed detached eddy simulation (IDDES) model, which has been successfully used by many researchers in modeling turbulent flows in complex conditions (Arolla, ; Gritskevich et al, ; Liu et al, ; Shi & Fu, ). In this model, regions near the wall surface are simulated with unsteady RANS method and others with LES method, which is both accurate and computing economy on grid.…”

Section: Basic Model and Control Equationsmentioning

confidence: 99%

Characteristics of Turbulent Aeolian Sand Movement Over Straw Checkerboard Barriers and Formation Mechanisms of Their Internal Erosion Form

Zhang

Huang

et al. 2018

JGR Atmospheres

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Straw checkerboard barrier (SCB) array is one of the most effective and widely used measures for antidesertification projects. The efficiency and durability of SCB are greatly influenced by the features of wind field and sand particle motion. Unfortunately, very few studies have explored the characteristics of turbulent flow and the internal erosional form inside the barrier cell, because of the complexity of turbulent flow and the sand particle motion around the surface of SCBs. In this paper, we simulated the wind-sand flow around SCBs using 3-D hybrid Reynolds-averaged Navier-Stokes/large eddy simulation method and Lagrangian particle tracing method to analyze the characteristics of turbulent flow, particle motion, and internal erosional form of SCBs. The results show that the vast majority of particles fall into SCB cells from their middle and posterior parts when wind-sand flow passes SCBs, due to the impact of gravity and subsidence flow. It indicates that SCBs could effectively prevent sand flow-induced hazards. The turbulent flow in SCBs has great instantaneous pulse velocity, resulting in retransfer of sand particles in SCBs. Analysis of the mean flow field in SCB found one huge streamwise vortex that filled the SCB cells and two spanwise vortexes in the back of SCB cells. These vortexes will drive particles inside SCBs to move toward the front and side walls, making the erosional form of SCB cells low in the middle and high near all the sides.Plain Language Summary Straw checkerboard barrier (SCB) is the most representative anti-desertification measure and plays a significant role in anti-desertification projects. We studied the wind-sand flow around SCBs using computational method and analyzed the characteristics of turbulent flow, particle motion and internal erosional form of SCBs. Based on the simulation results, the weakness of current SCBs can be identified. Therefore, this research is of significance in improving artificial sand control measures designed to help combat desertification control.

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“…Basically, the resolution requirement for WMLES in the stream-and spanwise directions scales with the boundary layer thickness. The improved delayed detached-eddy simulation (IDDES) [10,11] acts as a WMLES, if the large scale wall turbulence is sufficiently resolved, and can predict turbulent channel flow on a very coarse grid (no more than a million grid points) with Re τ ranging from 400 to 18 000. The resolution requirement is almost independent of the Reynolds number, and WMLES cannot be replaced by wall-resolved LES for high Reynolds number boundary layers in the near future.…”

Section: Introductionmentioning

confidence: 99%

Taking large-eddy simulation of wall-bounded flows to higher Reynolds numbers by use of anisotropy-resolving subgrid models

et al. 2017

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Properly resolved large-eddy simulations of wall-bounded high Reynolds number flows using standard subgrid-scale (SGS) models requires high spatial and temporal resolution. We have shown that a more elaborate SGS model taking into account the SGS Reynolds stress anisotropies can relax the requirement for the number of grid points by at least an order of magnitude for the same accuracy. This was shown by applying the recently developed explicit algebraic subgrid-scale model (EAM) [Marstorp et al., J. Fluid Mech. 639, 403 (2009)] to fully developed high Reynolds number channel flows with friction Reynolds numbers of 550, 2000, and 5200. The near-wall region is fully resolved, i.e., no explicit wall modeling or wall functions are applied. A dynamic procedure adjusts the model at the wall for both low and high Reynolds numbers. The resolution is reduced, from the typically recommended 50 and 15 wall units in the stream-and spanwise directions respectively, by up to a factor of 5 in each direction. It was shown by comparison with direct numerical simulations that the EAM is much less sensitive to reduced resolution than the dynamic Smagorinsky model. Skin friction coefficients, mean flow profiles, and Reynolds stresses are better predicted by the EAM for a given resolution. Even the notorious overprediction of the streamwise fluctuation intensity typically seen in poorly resolved LES is significantly reduced when EAM is used on coarse grids. The improved prediction is due to the capability of the EAM to capture the SGS anisotropy, which becomes significant close to the wall.

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A Comprehensive Study of Improved Delayed Detached Eddy Simulation with Wall Functions

Cited by 19 publications

References 37 publications

Active model split hybrid RANS/LES

Active model split hybrid RANS/LES

Characteristics of Turbulent Aeolian Sand Movement Over Straw Checkerboard Barriers and Formation Mechanisms of Their Internal Erosion Form

Taking large-eddy simulation of wall-bounded flows to higher Reynolds numbers by use of anisotropy-resolving subgrid models

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