Numerical simulation of strongly swirling turbulent flows in a liquid-liquid hydrocyclone using the Reynolds stress transport equation model

2000 ◽  
Vol 43 (1) ◽  
pp. 86-96 ◽  
Author(s):  
Yaojun Lu ◽  
Lixing Zhou ◽  
Xiong Shen
Keyword(s):  
Numerical Simulation ◽  
Transport Equation ◽  
Turbulent Flows ◽  
Reynolds Stress ◽  
Equation Model

Development and Application of an Anisotropic Two-Equation Model for Flows With Swirl and Curvature

2003 ◽  
Author(s):  
Xiaohua Wang ◽  
Siva Thangam
Keyword(s):  
Energy Spectrum ◽  
Turbulent Flows ◽  
Reynolds Stress ◽  
Scaling Laws ◽  
Reynolds Stress Model ◽  
Equation Model ◽  
Stress Model ◽  
Generalized Model

An anisotropic two-equation Reynolds-stress model is developed by modeling the energy spectrum and through invariance based scaling. In this approach the effect of rotation is used to modify the energy spectrum, while the influence of swirl is modeled based on scaling laws. The resulting generalized model is validated for benchmark turbulent flows with swirl and curvature.

Numerical Simulation of Channel Flows by a One-Equation Turbulence Model

1997 ◽  
Vol 119 (4) ◽  
pp. 885-892 ◽  
Author(s):  
V. I. Vasiliev ◽  
D. V. Volkov ◽  
S. A. Zaitsev ◽  
D. A. Lyubimov
Keyword(s):  
Numerical Simulation ◽  
Turbulent Flows ◽  
Turbine Blade ◽  
Turbulence Model ◽  
Turbulent Viscosity ◽  
Numerical Data ◽  
Equation Model ◽  
Channel Flows ◽  
Parabolic Flows

A one-equation model for turbulent viscosity, previously developed and tested for parabolic flows, is implemented in elliptic cases. The incompressible 2-D and axisymmetric flows in channel with back step as well as the incompressible and compressible 2-D flows in turbine blade cascades are calculated. The CFD procedures, developed for both incompressible and compressible turbulent flows simulation, are described. The results of calculations are compared with known experimental and numerical data.

A Calculation Method for Developing Turbulent Flow in Rectangular Ducts of Arbitrary Aspect Ratio

1995 ◽  
Vol 117 (2) ◽  
pp. 249-258 ◽  
Author(s):  
M. Naimi ◽  
F. B. Gessner
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Transport Equation ◽  
Reynolds Stress ◽  
Equation Model ◽  
Strain Component ◽  
Square Duct ◽  
Damping Function ◽  
Strain Behavior ◽  
Proposed Model

This paper describes a full Reynolds stress transport equation model for predicting developing turbulent flow in rectangular ducts. The pressure-strain component of the model is based on a modified form of the Launder, Reece and Rodi pressure-strain model and the use of a linear wall damping function. Predictions based on this model are compared with predictions referred to high Reynolds number and low Reynolds number k–ε transport equation models and with experimental data taken in square and rectangular ducts. The results indicate that the proposed model yields improved predictions of primary flow development and Reynolds stress behavior in a square duct. The proposed model also yields Reynolds stress anisotropy and secondary flow levels that are compatible and agree well with experiment, without recourse to a quadratic damping function to model near-wall pressure-strain behavior.

Analysis of Impinging and Countercurrent Stagnating Flows by Reynolds Stress Model

2002 ◽  
Vol 124 (3) ◽  
pp. 706-718 ◽  
Author(s):  
Yong H. Im ◽  
Kang Y. Huh ◽  
Kwang-Yong Kim
Keyword(s):  
Numerical Simulation ◽  
Kinetic Energy ◽  
Turbulent Flows ◽  
Reynolds Stress ◽  
Dissipation Rate ◽  
Flow Characteristics ◽  
Turbulence Models ◽  
Reynolds Stress Model ◽  
Stress Model ◽  
Stagnation Region

Numerical simulation is performed for stagnating turbulent flows of impinging and countercurrent jets by the Reynolds stress model (RSM). Results are compared with those of the k−ε model and available data to assess the flow characteristics and turbulence models. Three variants of the RSM tested are those of Gibson and Launder (GL), Craft and Launder (GL-CL) and Speziale, Sarkar and Gatski (SSG). As is well known, the k−ε model significantly overestimates turbulent kinetic energy near the wall. Although the RSM is superior to the k−ε model, it shows considerable difference according to how the redistributive pressure-strain term is modeled. Results of the RSM for countercurrent jets are improved with the modified coefficients for the dissipation rate, Cε1 and Cε2, suggested by Champion and Libby. Anisotropic states of the stress near the stagnation region are assessed in terms of an anisotropy invariant map (AIM).

NUMERICAL SIMULATION OF NON-ISOTHERMAL FLOW IN NATURALLY FRACTURED OIL RESERVOIRS USING A ONE-EQUATION MODEL

2019 ◽  
Author(s):  
Juan Diego dos Santos Heringer ◽  
Paulo de Tarço Honorio Junior ◽  
Grazione de Souza ◽  
Helio Pedro Amaral Souto
Keyword(s):  
Numerical Simulation ◽  
Equation Model ◽  
Isothermal Flow ◽  
Oil Reservoirs ◽  
Naturally Fractured
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