scholarly journals A flux-balanced fluid model for collisional plasma edge turbulence: Model derivation and basic physical features

2018 ◽  
Vol 25 (10) ◽  
pp. 102307 ◽  
Author(s):  
Andrew J. Majda ◽  
Di Qi ◽  
Antoine J. Cerfon
Keyword(s):  
Turbulence Model ◽  
Fluid Model ◽  
Collisional Plasma ◽  
Plasma Edge ◽  
Model Derivation ◽  
Physical Features

Analysis of Two-Phase Cavitating Flow with Two-Fluid Model Using Integrated Boltzmann Equations

2013 ◽  
Vol 5 (05) ◽  
pp. 607-638 ◽  
Author(s):  
Shuhong Liu ◽  
Yulin Wu ◽  
Yu Xu ◽  
Hua-Shu Dou
Keyword(s):  
Turbulence Model ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Three Dimensional ◽  
Cavitating Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Pump Sump ◽  
Two Fluid Model ◽  
Two Fluid

AbstractIn the present work, both computational and experimental methods are employed to study the two-phase flow occurring in a model pump sump. The two-fluid model of the two-phase flow has been applied to the simulation of the three-dimensional cavitating flow. The governing equations of the two-phase cavitating flow are derived from the kinetic theory based on the Boltzmann equation. The isotropic RNGk — ε — kcaturbulence model of two-phase flows in the form of cavity number instead of the form of cavity phase volume fraction is developed. The RNGk—ε—kcaturbulence model, that is the RNGk — eturbulence model for the liquid phase combined with thekcamodel for the cavity phase, is employed to close the governing turbulent equations of the two-phase flow. The computation of the cavitating flow through a model pump sump has been carried out with this model in three-dimensional spaces. The calculated results have been compared with the data of the PIV experiment. Good qualitative agreement has been achieved which exhibits the reliability of the numerical simulation model.

Development of a multi-fluid model for poly-disperse dense gas–solid fluidised beds, Part I: Model derivation and numerical implementation

2009 ◽  
Vol 64 (20) ◽  
pp. 4222-4236 ◽  
Author(s):  
M. van Sint Annaland ◽  
G.A. Bokkers ◽  
M.J.V. Goldschmidt ◽  
O.O. Olaofe ◽  
M.A. van der Hoef ◽  
...  
Keyword(s):  
Fluid Model ◽  
Numerical Implementation ◽  
Dense Gas ◽  
Model Derivation ◽  
Fluidised Beds

Volume of fluid model for an open channel flow problem

2005 ◽  
Vol 32 (5) ◽  
pp. 996-1001 ◽  
Author(s):  
A S Ramamurthy ◽  
Junying Qu ◽  
Diep Vo
Keyword(s):  
Experimental Data ◽  
Channel Flow ◽  
Turbulence Model ◽  
Open Channel ◽  
Fluid Model ◽  
Open Channel Flow ◽  
Pressure Head ◽  
Volume Of Fluid ◽  
Vof Model ◽  
Free Overfall

In the past, the solutions to open flow problems were generally found on the basis of experimental data or through the development of theoretical expressions using simplified assumptions. The volume of fluid (VOF) turbulence model can be applied to obtain the flow parameters such as pressure head distributions, velocity distributions, and water surface profiles for flow in open channels. The free overfall in a rectangular open channel that serves as a discharge measuring structure is selected to apply to the VOF model. The predictions of the proposed VOF model are validated using existing experimental data for both subcritical and supercritical flow approach conditions. Based on the path followed by a fluid particle leaving the brink section, the equations for the nappe profiles in supercritical flows are obtained in terms of the end depth. The VOF turbulence model developed is used to predict the characteristics of a free overfall in a rectangular open channel.Key words: turbulence model, VOF model, numerical simulation, overfall characteristics, open channel flow.

Fluid model equations for the tokamak plasma edge

1991 ◽  
Vol 3 (11) ◽  
pp. 3132-3152 ◽  
Author(s):  
E. L. Vold ◽  
F. Najmabadi ◽  
R. W. Conn
Keyword(s):  
Fluid Model ◽  
Tokamak Plasma ◽  
Plasma Edge ◽  
Model Equations

Investigation of Wide Range of Flow around Circular Cylinder Using Turbulence Model

2013 ◽  
Vol 664 ◽  
pp. 878-883 ◽  
Author(s):  
Kee Quen Lee ◽  
Abu Aminudin ◽  
Muhamad Pauziah
Keyword(s):  
Experimental Data ◽  
Circular Cylinder ◽  
Drag Coefficient ◽  
Strouhal Number ◽  
Turbulence Model ◽  
Pressure Coefficient ◽  
Wide Range ◽  
Flow Around Circular Cylinder ◽  
Turbulence Length ◽  
Physical Features

The purpose of present study is to identify the possibility of predicting the physical features of circular cylinder in two dimensional for a wide range of Reynolds number using a modified turbulence model. The modification is focused on the turbulence length and intensity. The drag coefficient and the Strouhal number were calculated and compared with the existing experimental data. The contour of vorticity and pressure gradient were also presented. Although variation up to 159% was noted in the drag coefficient, it was just on a particular Reynolds number.The simulated outputs of Strouhal number, pressure coefficient and vorticity contour indicated reasonable agreement with the experimental data. The modified turbulence model has showed potential in simulating the flow around the circular cylinder.

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