A Modified <i>k</i>-ε Model for Computation of Flows with Large Streamline Curvature

Yin, Jianchuan; Wang, Dezhong; Wu, Yulin; Walters, D. Keith

doi:10.1155/2013/592420

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The -model and -model are the most common turbulence models [1], which are a two-equation model including two extra transport equations to represent the turbulent properties of the flow. The -model and -model do not perform well in cases of large adverse pressure gradients [2]. The use of aformulation in the inner parts of the boundary layer makes the model directly usable all the way down to the wall through the viscous sublayer [3].…”

Section: Introductionmentioning

confidence: 99%

A Nonlineark-εTurbulence Model Applicable to High Pressure Gradient and Large Curvature Flow

Yin

Liu³

et al. 2014

Mathematical Problems in Engineering

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Most of the RANS turbulence models solve the Reynolds stress by linear hypothesis with isotropic model. They can not capture all kinds of vortexes in the turbomachineries. In this paper, an improved nonlinear k-turbulence model is proposed, which is modified from the RNG k-turbulence model and Wilcox's k-turbulence model. The Reynolds stresses are solved by nonlinear methods. The nonlinear k-turbulence model can calculate the near wall region without the use of wall functions. The improved nonlinear k-turbulence model is used to simulate the flow field in a curved rectangular duct. The results based on the improved nonlinear k-turbulence model agree well with the experimental results. The calculation results prove that the nonlinear k-turbulence model is available for high pressure gradient flows and large curvature flows, and it can be used to capture complex vortexes in a turbomachinery.

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Section: Introductionmentioning

confidence: 99%

A Nonlineark-εTurbulence Model Applicable to High Pressure Gradient and Large Curvature Flow

Yin

Liu³

et al. 2014

Mathematical Problems in Engineering

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Numerical Modeling of Inclined Dense Jets in Stagnant Water on a Sloped Bottom

Wang¹

2020

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Assessment of Two Streamline Curvature Correction Methods for an Elliptic Blending Turbulence Model

2022

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Using two different methods, a previously developed elliptic blending model (the original SST k-ω-φ-α model) is modified for sensitization to streamline curvature. One method involves modifying the dissipation term in the turbulent dissipation equation, while the other constructs a new formulation for the turbulent kinetic energy production term based on an explicit algebraic stress model. The capabilities of the proposed models are evaluated by applying them to three flows with curved surfaces; namely, the two-dimensional (2D) infinite serpentine passage flow, the 2D U-turn duct flow, and the 2D periodic hill flow. The SST k-ω model with rotation and curvature correction (the SST k-ω-CC model) is also used for comparison. The computed results are compared with the relevant direct numerical simulation, experimental, and large eddy simulation data from the literature. It is found that the two proposed models significantly improve upon the original SST k-ω-φ-α model. Compared with the SST k-ω-CC model, the two proposed models produce better results in the 2D infinite serpentine passage flow and the 2D periodic hill flow. The proposed models are similarly competitive with the SST k-ω-CC model in the 2D U-turn duct flow.

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A Modified k-ε Model for Computation of Flows with Large Streamline Curvature

Cited by 3 publications

References 15 publications

A Nonlineark-εTurbulence Model Applicable to High Pressure Gradient and Large Curvature Flow

A Nonlineark-εTurbulence Model Applicable to High Pressure Gradient and Large Curvature Flow

Numerical Modeling of Inclined Dense Jets in Stagnant Water on a Sloped Bottom

Assessment of Two Streamline Curvature Correction Methods for an Elliptic Blending Turbulence Model

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