Hybrid Simulation Approach for Cavity Flows: Blending, Algorithm, and Boundary Treatment Issues

Baurle, Robert A.; Tam, Chung-Jen; Edwards, James; Hassan, H. A.

doi:10.2514/2.1901

Cited by 23 publications

(49 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nikitin et al, 2000), others using different models in the two regions (among many others, cf. Baurle et al, 2003;Davidson & Peng, 2003;Temmerman et al, 2005). The classification of different hybrid LES/RANS methods is non-unique; one could easily classify into zero-, one-, and two-equation models instead, for example.…”

Section: Taxonomy Of Wmles Methodsmentioning

confidence: 99%

“…Nikitin et al, 2000;Shur et al, 2008, ...) (b) zonal: y int set by the user (most LES/RANS approaches) (cf. Baurle et al, 2003;Temmerman et al, 2005, .. LES resolves the energetic motions in regions (a) and (b), while DES97 only resolves those in region (a). This distinction is very important: it means that WMLES has the potential to be significantly more accurate than DES97 in non-equilibrium flows.…”

Section: Distinction Between Les Wmles and Desmentioning

confidence: 99%

See 1 more Smart Citation

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

Larsson

Kawai

Bodart

et al. 2016

Mechanical Engineering Reviews

394

231

View full text Add to dashboard Cite

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.

show abstract

Section: Taxonomy Of Wmles Methodsmentioning

confidence: 99%

Section: Distinction Between Les Wmles and Desmentioning

confidence: 99%

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

Larsson

Kawai

Bodart

et al. 2016

Mechanical Engineering Reviews

394

231

View full text Add to dashboard Cite

show abstract

“…Georgiadis et al [16] initiated the concept of explicit hybrid RANS/LES models by dividing the computational domain into RANS and LES regions. Baurle et al [17] proposed another concept of hybrid technique that is based on a k-ω RANS and a sub-grid scale turbulent kinetic energy (SGS TKE) model. It relies on modifying the RANS TKE equations to a form that is consistent with the SGS TKE equation based on a blending function.…”

Section: Introductionmentioning

confidence: 99%

“…The details of development for the DES and hybrid models, formulations and validation results for unsteady transonic cavity flows are provided in reference 18. The DES formulations are based on two-equation k-ε turbulence and the hybrid formulation is based on the combination [17] of the two-equation k-ε turbulence model [20] and a one-equation sub-grid-scale (SGS) model [21]. A blending function allows the SGS TKE equation to be triggered in the separated flow region and activates the RANS TKE equation in the attached flow region.…”

Section: Introductionmentioning

confidence: 99%

DES, Hybrid RANS/LES and PANS Models for Unsteady Separated Turbulent Flow Simulations

2005

View full text Add to dashboard Cite

This paper presents computational results for two DES (Detached Eddy Simulation), one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) and some preliminary results from PANS (Partially Averaged Navier-Stokes) turbulence for simulation of unsteady separated turbulent flows. The models are implemented in a full 3-D Navier Stokes solver and are based on the two-equation k-ε model. The formulations of each model are presented and results are analyzed for subsonic flow over a Backward Facing Step (BFS). Simulations are carried out using a 3rd order Roe scheme. A comparative assessment is made between the predictions from the DES, hybrid and PANS models. The predicted results are compared with the available experimental data for skin-friction coefficient, and different turbulent quantities. The three-dimensionality of the flow field and the separated fine scale structures are presented through the Q iso-surfaces.

show abstract

“…Hybrid turbulence modelling with VMS-Dynamic: The RANS closure terms provided by a RANS and a SGS eddy-viscosity model are blended together through the introduction of a blending function, θ, that yields to the RANS approach when θ = 1 and recovers the LES approach for θ vanishing. Thus, the adopted model can be thought to fall in the class of the blending methods [20,8,2], following the definition in [36]. It allows a natural integration of the VMS concept, [22], which allows the eddy-viscosity introduced by the LES closure to be restricted to the smallest resolved scales.…”

Section: Methodsmentioning

confidence: 99%

VMS and OES-Based Hybrid Simulations of Bluff Body Flows

Moussaed

Wornom²,

Koobus

et al. 2016

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

View full text Add to dashboard Cite

The present article focuses on the improvement of the two components of hybrid RANS/LES models. In the LES component, a Variational Multiscale (VMS) formulation [17] is introduced with the dynamic control of Germano et al, [11]. In the RANS component, an Organised Eddy Simulation (OES) model is used, [4,39]. The impact of these modifications on several critical flows past bluff bodies is analysed. These are the flow past cylinder at Re = 140, 000 entering the critical regime because of blockage ratio confinement, a flow past a cylinder at Re = 1, 000, 000, as well as the flow past a tandem cylinder at Re = 166, 000.Key words: hybrid turbulence models, RANS, VMS-LES, OES, DDES, bluff body flows.VMS-and OES-based hybrid simulations of bluff body flows and the existence of asymmetric forces on the cylinder surface (Bearman, 1965;Schewe, 1983). The passage to the critical and supercritical regime highly interests the aeronautics design and from a fundamental research point of view, the reasons of vortex shedding disappearance in a specific supercritical Reynolds number range. The numerical simulation of the drag crisis and of the supercritical regime remain important CFD challenges. The supercritical regime offers the possibility of the boundary layer treatment as fully turbulent, which is a simpler situation in respect for turbulence modelling issues than the transitional regime corresponding to the drag crisis. In this context, LES approaches and advanced URANS and hybrid RANS-LES methods can be adapted in order to capture the boundary layer nature and the transition location. LES methods need a quite high number of degrees of freedom (of order 100-500 Million for the single cylinder's problem, Rolfo-Revell et al, (2013) [34], Rodriguez et al, 2013 [18]), whereas hybrid methods are generally more economic as seen in the collected articles of the 4th Hybrid RANS-LES methods symposium (Girimaji et al, 2015 [1]). The objective of the present article is to offer reliable hybrid methods needing relatively economic grids.

show abstract

Hybrid Simulation Approach for Cavity Flows: Blending, Algorithm, and Boundary Treatment Issues

Cited by 23 publications

References 13 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

DES, Hybrid RANS/LES and PANS Models for Unsteady Separated Turbulent Flow Simulations

VMS and OES-Based Hybrid Simulations of Bluff Body Flows

Contact Info

Product

Resources

About