Modification of Spalart–Allmaras model with consideration of turbulence energy backscatter using velocity helicity

Liu, Yangwei; Lu, Lipeng; Fang, Le; Gao, Feng

doi:10.1016/j.physleta.2011.05.023

Cited by 128 publications

(51 citation statements)

References 14 publications

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“…Evidently, most realistic turbulent flows are non-equilibrium. Indeed, the non-equilibrium property is more obvious in the regions of coherent structures, such as transition, wake and separation [17][18][19]. Does the non-equilibrium property play an important role in the LES calculation and even prevent the simulations from accurately predicting the coherent structures?…”

Section: Definition Of Spectral Non-equilibrium Property In Homogeneomentioning

confidence: 99%

Spectral non-equilibrium property in homogeneous isotropic turbulence and its implication in subgrid-scale modeling

et al. 2015

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Section: Definition Of Spectral Non-equilibrium Property In Homogeneomentioning

confidence: 99%

Spectral non-equilibrium property in homogeneous isotropic turbulence and its implication in subgrid-scale modeling

et al. 2015

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“…A second-order upwind scheme and the central-differencing scheme are used for the convection terms in RANS and DDES, respectively. In cases for RANS calculation, turbulence model is one of the key elements and a weakness in CFD for engineering [12,13]; therefore, the Reynolds stress model (RSM) is used according to our previous studies [12,14]. According to the experiment, the velocity of the main flow is set as 23.0 m/s given the profile of boundary layer at inlet, as shown in Figure 3.…”

Section: Rans Numerical Methodsmentioning

confidence: 99%

Numerical Study of the Effect of Secondary Vortex on Three-Dimensional Corner Separation in a Compressor Cascade

Liu¹,

Yan²,

Lu³

2016

International Journal of Turbo &Amp; Jet-Engines

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Abstract:The complex flow structures in a linear compressor cascade have been investigated under different incidences using both the Reynolds-averaged NavierStokes (RANS) and delayed detached eddy simulation (DDES) methods. The current study analyzes the development of horseshoe vortex and passage vortex in a compressor cascade based on DDES results and explores the effect of the passage vortex on corner separation using the RANS method. Results show that the effect of horseshoe vortex on three-dimensional corner separation is weak, whereas the effect of passage vortex is dominant. A large vortex breaks into many small vortices in the corner separation region, thereby resulting in strong turbulence fluctuation. The passage vortex transports the low-energetic flow near the endwall to the blade suction surface and enlarges corner separation in the cascade. Hence, total pressure loss increases in the cascade.

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“…Reynolds-averaged Navier-Stokes (RANS) simulations are commonly used by industries. In the case of corner separation, RANS simulations tend to over-predict its size and intensity [7,8,9]. Bordji et al [10] found that using a nonBoussinesq constitutive relation (the quadratic constitutive relation, referred to as QCR [11]) yields better results for external flows.…”

Section: Introductionmentioning

confidence: 99%

Budget Analysis of Turbulent Kinetic Energy in Corner Separation : Rans vs Les

Monier¹,

Gao²,

Boudet³

et al. 2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Abstract. The aim of the study is to compare the LES of corner separation, considered as a reference, in the LMFA-NACA65 linear compressor cascade to RANS simulations using Wilcox two-equation models (k − ω). The LES was carried-out by Gao et al. First, the analysis will consider the total pressure losses on a two-dimensional section downstream of the cascade. The Reynolds stresses and the turbulent kinetic energy budget are analysed within the separation region, on a two-dimensional section at the trailing edge of the blade. The RANS simulations mostly overestimate the total pressure losses and the size of the corner separation, compared to the LES and the experiment. The RANS simulations also overestimate the level of the Reynolds stresses and the terms of the turbulent kinetic energy budget, compared to the LES. The quadratic constitutive relation yields some modifications, but not significant enough to have results comparable to LES.

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Modification of Spalart–Allmaras model with consideration of turbulence energy backscatter using velocity helicity

Cited by 128 publications

References 14 publications

Spectral non-equilibrium property in homogeneous isotropic turbulence and its implication in subgrid-scale modeling

Spectral non-equilibrium property in homogeneous isotropic turbulence and its implication in subgrid-scale modeling

Numerical Study of the Effect of Secondary Vortex on Three-Dimensional Corner Separation in a Compressor Cascade

Budget Analysis of Turbulent Kinetic Energy in Corner Separation : Rans vs Les

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