Very-Large-Eddy Simulation Based on k-ω Model

Han, Xingsi; Krajnović, Siniša

doi:10.2514/1.j053341

Cited by 46 publications

(12 citation statements)

References 29 publications

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“…Between the two limits of RANS and DNS, it is named as VLES. The general development details can be found in previous references (Han and Krajnovic, 2013;Han and Krajnovic, 2015). Here the modeling is briefly described as follows.…”

Section: Very-large Eddy Simulation Modelingmentioning

confidence: 99%

“…In recent years, new self-adaptive turbulence models, such as VLES (Very-Large Eddy Simulation) (Han and Krajnovic, 2013;Han and Krajnovic, 2015) and PANS (Partially-Averaged Navier-Stokes) (Girimaji, 2006;Saroha et al 2018), are of growing interests in the hybrid RANS-LES modeling for applications to the complex turbulent flow of industrial relevance. The VLES method is a unified simulation approach enabling a seamless evolution from RANS to LES and finally approaching DNS depending on the numerical resolution.…”

Section: Introductionmentioning

confidence: 99%

“…The VLES method is a unified simulation approach enabling a seamless evolution from RANS to LES and finally approaching DNS depending on the numerical resolution. The VLES method works quite efficiently for several canonical high Re turbulent flows (Han and Krajnovic, 2013;Han and Krajnovic, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of VLES and LES Turbulence Modeling for Swirling Turbulent Flow

Tiwari¹,

Xia²,

Han³

2020

JAFM

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Swirling flow has been widely used in gas turbine and aero-engine combustor to stabilize the flame. However, accurate numerical prediction of the swirling turbulent flow is difficult due to complex vortex movement in the flow, and turbulence modeling is a key factor. To assess the turbulence modeling in predicting the swirling flow, numerical studies are conducted for a well-documented swirling flow case. Three turbulence models are applied in the framework of scale resolved models, i.e. a newly developed VLES (Very-large eddy simulation) model, two LES (Large eddy simulation) models including the WALE (Walladapting local eddy viscosity model) and CSM (Coherent Structure Method). Numerical results are compared with the experimental results including the mean and RMS velocities. It is found that VLES model performs best among the three models and the other two LES models give comparable predictions. The complex vortex structures are explored based on the unsteady simulation results. The study demonstrates the high potential of VLES modeling for accurate prediction of complex swirling flow.

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Section: Very-large Eddy Simulation Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of VLES and LES Turbulence Modeling for Swirling Turbulent Flow

Tiwari¹,

Xia²,

Han³

2020

JAFM

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“…The turbulence stress is reformulated with the introduction of Fr. More details about the VLES modelling approach and its implementation can be found in other references (Han and Krajnovic, 2013;Han and Krajnovic, 2015).…”

Section: Numerical Methodologymentioning

confidence: 99%

“…Thus, the coarse mesh can be used for high Reynolds number turbulent flow and also the accuracy can be maintained. In recent years, VLES (Very-Large Eddy Simulation) (Han and Krajnovic, 2013;Han and Krajnovic, 2015) has been found to be an efficient modelling approach for complex turbulent flow simulations. It has been validated in many classical turbulent flows.…”

Section: Introductionmentioning

confidence: 99%

Very-Large Eddy Simulation of Complex Turbulent Flame Based on FGM

Han¹,

Astronautics²,

Wan³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

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High fidelity simulation of complex turbulent flame is still challenging from many aspects. The present study aims to make the progress from two aspects. The first one is the turbulence modeling, which is achieved by using the newly developed VLES (Very-Large Eddy Simulation) method. The VLES method is a self-adaptive turbulence modeling method which can resolve the turbulence based on the local mesh resolution and the local turbulence scale information. It evolves smoothly from RANS to DNS with the increase of the mesh resolution. It thus can provide accurate predictions on relatively coarse meshes. The second one is the combustion modeling, which is done by combining the FGM (Flamelet Generated Manifold) method. FGM method is an efficient chemistry reduction technique, which has attracted attentions for the successful applications to various complex combustion systems. The present study thus makes the effort to combine the VLES and FGM methods to model complex turbulent flames. Two test cases are selected, i.e. the classical Sandia D flame and the swirling premixed flame from a single GE LM6000 combustor. The numerical results are compared with available experiments. It is found that the VLES-FGM method can be successfully applied for the high fidelity simulation of the complex test flames. The VLES method has high potentials for turbulent flame simulations.

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The State of the Art of Hybrid RANS/LES Modeling for the Simulation of Turbulent Flows

Chaouat

2017

Flow Turbulence Combust

154

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This review presents the state of the art of hybrid RANS/LES modeling for the simulation of turbulent flows. After recalling the modeling used in RANS and LES methodologies, we propose in a first step a theoretical formalism developed in the spectral space that allows to unify the RANS and LES methods from a physical standpoint. In a second step, we discuss the principle of the hybrid RANS/LES methods capable of representing a RANS-type behavior in the vicinity of a solid boundary and an LES-type behavior far away from the wall boundary. Then, we analyze the principal hybrid RANS/LES methods usually used to perform numerical simulation of turbulent flows encountered in engineering applications. In particular, we investigate the very large eddy simulation (VLES), the detached eddy simulation (DES), the partially integrated transport modeling (PITM) method, the partially averaged Navier-Stokes (PANS) method, and the scale adaptive simulation (SAS) from a physical point of view. Finally, we establish the connection between these methods and more precisely, the link between PITM and PANS as well as DES and PITM showing that these methods that have been built by different ways, practical or theoretical manners have common points of comparison. It is the opinion of the author to consider that the most appropriate method for a particular application will depend on the expectations of the engineer and the computational resources the user is prepared to expend on the problem.

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Very-Large-Eddy Simulation Based on k-ω Model

Cited by 46 publications

References 29 publications

Comparison of VLES and LES Turbulence Modeling for Swirling Turbulent Flow

Comparison of VLES and LES Turbulence Modeling for Swirling Turbulent Flow

Very-Large Eddy Simulation of Complex Turbulent Flame Based on FGM

The State of the Art of Hybrid RANS/LES Modeling for the Simulation of Turbulent Flows

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