Second-order moment modeling of dispersed two-phase turbulence-Part 2-USM-Θ two-phase turbulence model and USM-SGS two-phase stress model

2011 ◽  
Vol 54 (7) ◽  
pp. 1296-1303 ◽  
Author(s):  
LiXing Zhou
Keyword(s):  
Turbulence Model ◽  
Second Order ◽  
Order Moment ◽  
Stress Model ◽  
Two Phase

A Nonlinear k-ε-kp Two-Phase Turbulence Model

2003 ◽  
Vol 125 (1) ◽  
pp. 191-194 ◽  
Author(s):  
L. X. Zhou ◽  
H. X. Gu
Keyword(s):  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Turbulence Model ◽  
Computation Time ◽  
Second Order ◽  
Phase Correlation ◽  
Order Moment ◽  
Reynolds Stresses ◽  
Two Phase ◽  
Particle Flows

Nonlinear relationships of two-phase Reynolds stresses with the strain rates together with the transport equations of gas and particle turbulent kinetic energy and the two-phase correlation turbulent kinetic energy are proposed as the nonlinear k-ε-kp turbulence model. The proposed model is applied to simulate swirling gas-particle flows. The predicted two-phase time-averaged velocities and Reynolds stresses are compared with the PDPA measurements and those predicted using the second-order moment model. The results indicate that the nonlinear k-ε-kp model has the modeling capability near to that of the second-order moment model, but the former can save much computation time than the latter.

On the second-order moment turbulence model for simulating a bubble column

2002 ◽  
Vol 57 (16) ◽  
pp. 3269-3281 ◽  
Author(s):  
L.X. Zhou ◽  
M. Yang ◽  
C.Y. Lian ◽  
L.S. Fan ◽  
D.J. Lee
Keyword(s):  
Turbulence Model ◽  
Bubble Column ◽  
Second Order ◽  
Order Moment

Simulation of Swirling Gas-Particle Flows Using Different Time Scales for the Closure of Two-Phase Velocity Correlation in the Second-Order Moment Two-Phase Turbulence Model1

2003 ◽  
Vol 125 (2) ◽  
pp. 247-250 ◽  
Author(s):  
Y. Yu ◽  
L. X. Zhou ◽  
C. G. Zheng ◽  
Z. H. Liu
Keyword(s):  
Phase Velocity ◽  
Time Scale ◽  
Second Order ◽  
Order Moment ◽  
Velocity Correlation ◽  
Two Phase ◽  
Fluctuation Velocity ◽  
Particle Flows ◽  
Measured Particle ◽  
Different Time Scales

Three different time scales—the gas turbulence integral time scale, the particle relaxation time, and the eddy interaction time—are used for closing the dissipation term in the transport equation of two-phase velocity correlation of the second-order moment two-phase turbulence model. The mass-weighted averaged second-order moment (MSM) model is used to simulate swirling turbulent gas-particle flows with a swirl number of 0.47. The prediction results are compared with the PDPA measurement results taking from references. Good agreement is obtained between the predicted and measured particle axial and tangential time-averaged velocities. There is some discrepancy between the predicted and measured particle axial and tangential fluctuation velocities. The results indicate that the time scale has an important effect. It is found that the predictions using the eddy interaction time scale give the right tendency—for example, the particle tangential fluctuation velocity is smaller than the gas tangential fluctuation velocity, as that given by the PDPA measurements.

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