Turbulence Modeling for Very Large-Eddy Simulation

Liu, Nan-Suey; Shih, Tsan‐Hsing

doi:10.2514/1.14452

Cited by 47 publications

(30 citation statements)

References 22 publications

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“…5 hints. Using the same grid and the same conditions, but smaller time steps, a simulation with the VLES approximation was tested with a value of RCP of 0.38, the same value as in Liu & Shih (2006), and the corresponding results are shown in the right view of Fig. 5.…”

Section: ( ) ( )mentioning

confidence: 99%

“…If the width of the temporal filter is further reduced towards the Taylor microtimescale and beyond, a complete category of simulation forms, the Partially Resolved Numerical Simulation (PRNS) is obtained (see e.g. Liu & Shih, 2006). In this category, the dependent variables can develop from pure statistical means (RANS) through partially resolved large-scale variables (LES) to, eventually, completely resolved direct-simulated variable (DNS).…”

Section: The Numerical Solution Of the Navier-stokes Equationsmentioning

confidence: 99%

“…ANSYS Fluent, 2006) are needed for completing the model characterization. The definition of the turbulent viscosity belonging to the SST model, including the VLES modification according to Liu & Shih (2006) According to the analysis of Liu & Shih (2006), an estimate of the lower limit of RCP may be obtained using instead a quotient of length scales, an equivalence supported by the study of Fadai-Ghotbi et al (2010), giving in this case…”

Section: ( ) ( )mentioning

confidence: 99%

“…Different DES formulations using the SST model as the RANS component (Spalart, 1997, Morton et al, 2004, Li, 2007, Lynch & Smith, 2008, Gilling et al, 2009, Dietiker & Hoffmann, 2009, Zaki et al, 2010 have been applied to a wide variety of problems, again with an emphasis on aerodynamics, giving encouraging results. In any event, DES still demands significant computer and software resources and, at the same time, suffers from a number of pitfalls like the already mentioned premature gridinduced separation and the more serious difficulties to demonstrate grid convergence and the absence of a theoretical order of accuracy (Spalart, 2009) together with the log-layer mismatch in channel flow simulation (Hamba, 2009 Liu & Shih (2006) and is motivated by the assertion that small-scale motions have small associated time scales, allowing for the use of temporal filtering for defining the resolved scales (see also Shih & Liu 2006, Shih & Liu, 2008, Shih & Liu 2009and Shih & Liu, 2010. Other methodologies for achieving PRNS, not necessarily relying on temporal filtering, have been proposed in the literature, such as that of Ruprecht et al (2003), that of Perot & Gadebusch (2007 or the one of Hsieh et al (2010), but the abovementioned approach of Liu & Shih is the most attractive due to its inherent simplicity.…”

Section: Les Des and Vlesmentioning

confidence: 99%

“…In the brief review of the approach of Liu & Shih (2006) that follows, the large-scale motions are defined using a temporal filter of fixed width, i.e. if φ is a large-scale variable then…”

Section: Moreover I F T H E V a L U E O F T H E R E Y N O L D S N U mentioning

confidence: 99%

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Section: ( ) ( )mentioning

confidence: 99%

Section: The Numerical Solution Of the Navier-stokes Equationsmentioning

confidence: 99%

Section: ( ) ( )mentioning

confidence: 99%

Section: Les Des and Vlesmentioning

confidence: 99%

Section: Moreover I F T H E V a L U E O F T H E R E Y N O L D S N U mentioning

confidence: 99%

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An efficient very large eddy simulation model for simulation of turbulent flow

Han

Krajnović

2012

Numerical Methods in Fluids

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SUMMARYAmong the various hybrid methodologies, Speziale's very large eddy simulation (VLES) is one that was proposed very early. It is a unified simulation approach that can change seamlessly from Reynolds Averaged Navier–Stokes (RANS) to direct numerical simulation (DNS) depending on the numerical resolution. The present study proposes a new improved variant of the original VLES model. The advantages are achieved in two ways: (i) RANS simulation can be recovered near the wall which is similar to the detached eddy simulation concept; (ii) a LES subgrid scale model can be reached by the introduction of a third length scale, that is, the integral turbulence length scale. Thus, the new model can provide a proper LES mode between the RANS and DNS limits. This new methodology is implemented in the standard k − ϵ model. Applications are conducted for the turbulent channel flow at Reynolds number of Reτ = 395, periodic hill flow at Re = 10,595, and turbulent flow past a square cylinder at Re = 22,000. In comparison with the available experimental data, DNS or LES, the new VLES model produces better predictions than the original VLES model. Furthermore, it is demonstrated that the new method is quite efficient in resolving the large flow structures and can give satisfactory predictions on a coarse mesh. Copyright © 2012 John Wiley & Sons, Ltd.

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Validation of a novel very large eddy simulation method for simulation of turbulent separated flow

Han

Krajnović

2013

Numerical Methods in Fluids

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SUMMARY The paper describes the validation of a newly developed very LES (VLES) method for the simulation of turbulent separated flow. The new VLES method is a unified simulation approach that can change seamlessly from Reynolds‐averaged Navier–Stokes to DNS depending on the numerical resolution. Four complex test cases are selected to validate the performance of the new method, that is, the flow past a square cylinder at Re = 3000 confined in a channel (with a blockage ratio of 20%), the turbulent flow over a circular cylinder at Re = 3900 as well as Re = 140,000, and a turbulent backward‐facing step flow with a thick incoming boundary layer at Re = 40,000. The simulation results are compared with available experimental, LES, and detached eddy simulation‐type results. The new VLES model performs well overall, and the predictions are satisfactory compared with previous experimental and numerical results. It is observed that the new VLES method is quite efficient for the turbulent flow simulations; that is, good predictions can be obtained using a quite coarse mesh compared with the previous LES method. Discussions of the implementation of the present VLES modeling are also conducted on the basis of the simulations of turbulent channel flow up to high Reynolds number of Reτ = 4000. The efficiency of the present VLES modeling is also observed in the channel flow simulation. From a practical point of view, this new method has considerable potential for more complex turbulent flow simulations at relative high Reynolds numbers. Copyright © 2013 John Wiley & Sons, Ltd.

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Turbulence Modeling for Very Large-Eddy Simulation

Cited by 47 publications

References 22 publications

Numerical Simulation of Industrial Flows

Numerical Simulation of Industrial Flows

An efficient very large eddy simulation model for simulation of turbulent flow

Validation of a novel very large eddy simulation method for simulation of turbulent separated flow

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