Towards Multi-Component Analysis of Gas Turbines by CFD: Integration of RANS and LES Flow Solvers

Schlüter, Jörg; Pitsch, Heinz; Moin, Parviz; Shankaran, Sriram; Kim, Sangho; Alonso, Juan J.

doi:10.1115/gt2003-38350

Cited by 19 publications

(16 citation statements)

References 19 publications

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“…An interface is used to communicate the flow variables between both flow solvers. 11 The inflow of the upstream pipe is defined as a laminar parabolic inflow in the axial direction and a parabolic profile in the azimuthal direction, thus, simulating a laminar swirling pipe flow. The swirl number of this flow is S = 0.15, where with u x the axial velocity component and u φ the azimuthal velocity component.…”

Section: Test Case and Flow Solvermentioning

confidence: 99%

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Antialiasing Filters for Coupled Reynolds-Averaged/Large-Eddy Simulations

Schlüter

Pitsch

2005

AIAA Journal

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The increasing complexity of engineering problems makes the coupling of multiple simulation codes attractive. In fluid mechanical applications, the physical range of flow phenomena that can be modeled can be extended significantly by coupling flow solvers based on the Reynolds-averaged Navier-Stokes (RANS) approach and on large-eddy simulations (LES). These separate flow solvers run simultaneously and exchange information at the interface. However, because the LES flow solver operates usually with a much smaller time step, the LES data have to be sampled to provide data for the RANS flow solver. In the sampling process, aliasing errors can occur. Possibilities are investigated to suppress aliasing errors while preserving the amplitude and phase of the long wave spectrum. Nomenclaturea m , b n = filter constants D = diameter of the pipe f = frequency H (λ) = desired filter response N , M = order of the filter Re = Reynolds number r (t k ) = filter response on the discrete time t k S = swirl number Sr = Strouhal number s(t k )= original signal on the discrete time t k t = time on the large-eddy-simulation timescale u c = convective velocity u x , u r , u φ = velocity components in axial, radial, and azimuthal direction x, r, φ = coordinates in axial, radial, and azimuthal direction x 0 = location of the interface point λ = nondimensional frequency τ = time on the Reynolds-averaged Navier-Stokes timescale

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Section: Test Case and Flow Solvermentioning

confidence: 99%

“…(9), t total = t filter + t origin shift (11) The filter time delay t filter is defined corresponding to Eq. (4).…”

Section: Spatial Filter: Phase Responsementioning

confidence: 99%

Antialiasing Filters for Coupled Reynolds-Averaged/Large-Eddy Simulations

Schlüter

Pitsch

2005

AIAA Journal

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“…Some validation studies of the individual flow solvers are given in Yao et al 8 and Davis et al 1,23 for the TFLO code and in Mahesh et al 24 and Constantinescu et al 2 for the CDP code. The interface has been developed and tested in detail over the last two years [14][15][16] . While many of the techniques necessary for coupling these two flow solvers are still under development, all necessary elements, such as the coupling procedure and the boundary conditions on both sides are currently in place for the chosen test-case.…”

Section: Integrated Rans-les Of a Compressor-prediffusermentioning

confidence: 99%

“…The optimization of the communication and the processing of the exchanged data to meaningful boundary conditions are some of the encountered challenges. In previous work interface routines have been established and validated with simple geometries [14][15][16] . The interface used for establishing a connection between the flow solvers consists of routines following an identical algorithm in all flow solvers.…”

Section: Interfacementioning

confidence: 99%

Integrated RANS-LES Computations in Gas Turbines: Compressor-Diffusor Coupling

Schlüter

Kim

et al. 2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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Multi-component effects, such as compressor-combustor interactions, are difficult to predict with computational fluid dynamics using reasonable computational resources due to the variety of physical phenomena, which have to be modeled. The approach described in the present study is to couple two separate flow solvers, a RANS flow solver computing the last stage of a compressor and an LES flow solver computing the prediffuser of a combustor. At the interface the flow solvers exchange the flow data in order to define each others boundary conditions at the interface plane. The use of multiple flow solvers allows the application of the most appropriate flow solver for each flow section. The present study describes the approach in general, the interface, which allows running multiple flow solvers, its validation, and presents its application to the compressor-diffuser example.

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“…The first is to define an interface which enables communication and exchange of the flow variables between the solvers. Previous work (Shankaran et al, 2001;Schlüter et al, 2003a;Schlüter et al, 2003b) has established the algorithms which specify the interface and allow information exchange between two or more CFD solvers.…”

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confidence: 99%

An overset grid method coupling an orthogonal curvilinear grid solver and a Cartesian grid solver

Hanaoka¹

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Frederick Stern, who had supported me throughout my thesis with his patience and knowledge. I would also like to give my thanks to my collaborators, Dr. Shanti Bhushan and Dr. Jianming Yang. This thesis would not have been possible without their guidance, support, and constructive discussion. I would also like to convey my sincere gratitude to my advisory committee members, Professor George Constantinescu, James Buchholz, and Pablo Carrica. I would like to express my appreciation to Dr. Yusuke Tahara in NMRI (National Maritime Research Institute) who used to be my advisor at Osaka Prefecture University and inspired me to study in Ph. D. program at the University of Iowa. I am grateful to so many friends and colleagues in IIHR and the University of Iowa for the great time we share in Iowa. I am indebted to my parents, Nobuaki Hanaoka and Terue Hanaoka, for their encouragement and support especially for the life in the United States of America.

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Towards Multi-Component Analysis of Gas Turbines by CFD: Integration of RANS and LES Flow Solvers

Cited by 19 publications

References 19 publications

Antialiasing Filters for Coupled Reynolds-Averaged/Large-Eddy Simulations

Antialiasing Filters for Coupled Reynolds-Averaged/Large-Eddy Simulations

Integrated RANS-LES Computations in Gas Turbines: Compressor-Diffusor Coupling

An overset grid method coupling an orthogonal curvilinear grid solver and a Cartesian grid solver

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