Assessment and Validation of Very-Large-Eddy Simulation Turbulence Modeling for Strongly Swirling Turbulent Flow

Xia, Zhaoyang; Han, Xingsi; Mao, Junkui

doi:10.2514/1.j058302

Cited by 17 publications

(10 citation statements)

References 44 publications

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“…Recently, a strong swirling flow, Sr = 1.16 and Sr = 1.23, has also been simulated using the VLES model. The study confirms the validity and accuracy of the VLES model for complex strongly swirling turbulent flow (Xia et al 2020;Tiwari et al 2020).…”

Section: Introductionsupporting

confidence: 76%

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Very-Large-Eddy Simulation of Nonreactive Turbulent Flow for Annular Trapped Vortex Combustor

Zhang

Jin

Han

et al. 2022

JAFM

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A hybrid Reynolds-averaged Navier-Stokes (RANS) large eddy simulation (LES) method is applied in this work. It called very-large-eddy simulation (VLES) turbulence closure model. The aim of this present study is firstly to validate the accuracy of this method for a specific engineering application (a trapped vortex combustor) and secondly to describe its flow characteristics. The trapped vortex combustor is a new concept that utilizes a large recirculation vortex to stabilize the flame. An accurate prediction of the turbulent flow is meaningful for the trapped vortex combustor. The time-averaged velocity, root-mean-square (rms) velocity, and flow pattern are compared with the experimental data. And the LES model, RANS BSL k-ω model, and RANS k-ɛ model are also applied for the simulation with different mesh resolutions. The results show that the VLES BSL k-ω model provides improved accuracy for velocity prediction. The classical large vortex structure for the trapped vortex combustor is captured qualitatively by the VLES BSL k-ω model also. In addition, the vortex breakdown and processing vortex cone are visualized using the Q-criterion. Furthermore, the VLES BSL k-ω model is not sensitive to the gird resolution. The VLES method is able to predict the turbulent flow of trapped vortex combustor relatively well.

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Section: Introductionsupporting

confidence: 76%

“…SBES is a fairly simple concept where existing RANS and LES models are 'blended' by a shielding (or blending) function. The SBES turbulence model and the flamelet generated manifold (FGM) combustion model are both used by Xia et al (2020). The results have been shown to be capable of accurately modeling the film-cooled scenarios.…”

Section: Introductionmentioning

confidence: 99%

Very-Large-Eddy Simulation of Nonreactive Turbulent Flow for Annular Trapped Vortex Combustor

Zhang

Jin

Han

et al. 2022

JAFM

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“…Among them, the first row is categorized by how the language is used: (1) the operations of data communication and sharing are realized in the form of libraries, while other operations are represented by traditional serial language elements; (2) the parallel semantics are expressed explicitly or implicitly by language constructs or primitives. The second column categorizes the languages according to the address space visible to each execution [11].…”

Section: Methodsmentioning

confidence: 99%

Heterogeneous Cluster Application Communication Optimization and Computer Big Data Management

Wang

2022

Wireless Communications and Mobile Computing

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In order to adapt to the constantly updated heterogeneous hardware and super-large-scale parallel computing environment and solve the problems of low programming level and difficult development, modification, and debugging of commonly used solutions, the author proposes a method for application communication optimization and computer big data management based on heterogeneous clusters. A new language mechanism is introduced to describe the multidimensional rule structure, arrangement, and communication mode of data and threads; and a software migration and optimization method between different types of heterogeneous systems based on the new language mechanism is proposed. And take direct method turbulence simulation as an example. Experimental results show that based on the Parray mechanism, it took only one week to complete the rapid migration of turbulence simulation applications on the Tianhe 1A system, and it was successfully run on a scale of 8192 cubic meters. Conclusion. The method realizes communication optimization and fast porting in different heterogeneous systems.

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“…Studies on similar flow topologies have shown that LES can predict the fluctuations well, but those studies compared LES with LDA data and LDA has a much better spatial resolution compared to PIV. 58,59 The PIV resolution acts as a spatial filter, reducing the amplitude of the fluctuations 11 . The maximal wavelength which can be captured is equal to π/∆, where ∆ is the size of the interrogation area (1.12 mm in the study of Percin et al 12 ).…”

Section: B Experimental Validationmentioning

confidence: 99%

Determination of single and double helical structures in a swirling jet by spectral proper orthogonal decomposition

Zhang

Vanierschot

2021

Physics of Fluids

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This paper studies the coherent structures found in an annular swirling jet flow undergoing vortex breakdown with control parameters the Reynolds number Re=8500 and the swirl number Sw=0.38. The flow field is simulated using the large eddy simulation (LES) method with a dynamic k model. The first-and second-order statistics of the velocity fields are compared to tomographic particle image velocimetry measurements of the same flow configuration to validate the numerical simulation. The fast Fourier transform of the sampled velocity and pressure signals indicates a precessing vortex core with a frequency of 22 Hz. This frequency is in line with the one detected by spectral proper orthogonal decomposition (SPOD), which is utilized to identify the coherent structures in the near-field region of the swirling flow in the present work. In detail, apart from the single helical structure usually found in swirling flows, a double helix, rarely observed in turbulent swirling jets, is also identified. This structure is not a second-order harmonic mode of the single one as shown by statistical analysis of the mode temporal coefficients. Moreover, the calculation of energy production shows that this coherent precessing motion extracts energy from the mean flow field in the wake behind the bluff-body and in the break up region of the vortex.

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Assessment and Validation of Very-Large-Eddy Simulation Turbulence Modeling for Strongly Swirling Turbulent Flow

Cited by 17 publications

References 44 publications

Very-Large-Eddy Simulation of Nonreactive Turbulent Flow for Annular Trapped Vortex Combustor

Very-Large-Eddy Simulation of Nonreactive Turbulent Flow for Annular Trapped Vortex Combustor

Heterogeneous Cluster Application Communication Optimization and Computer Big Data Management

Determination of single and double helical structures in a swirling jet by spectral proper orthogonal decomposition

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