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Numerical Simulation of countercurrent flow in a PWR Hot Leg by Using Two-Fluid Model

Journal of Energy and Power Engineering 2013年第7期7卷 1215-1222页

作者： Michio Murase Yoichi Utanohara Chihiro Yanagi Takashi Takata Akira Yamaguchi Akio Tomiyama Institute of Nuclear Technology Institute of Nuclear Safety System Fukui 919-1205 Japan Department of Sustainable Energy and Environmental Engineering Osaka University Osaka 565-0871 Japan Department of Mechanical Engineering Kobe University Hyogo 657-8501 Japan

In order to evaluate CCFL （countercurrent flow limitation） characteristics in a PWR （pressurized water reactor） hot leg under reflux condensation, numerical simulations have been conducted using a 2F （two-fluid） model and a VOF （volume of fluid） method implemented in the CFD （computational fluid dynamics） software, FLUENT6.3.26. The 2F model gave good agreement with CCFL data in low pressure conditions but did not give good results for high pressure steam-water conditions. In the previous study, the computational grid and schemes were improved in the VOF method to improve calculations in circular tubes, and the calculated CCFL characteristics agreed well with the UPTF （Upper Plenum Test Facility） data at 1.5 MPa. In this study, therefore, using the 2F model and the computational grid previously improved for the VOF calculations, numerical simulations were conducted for steam-water flows at 1.5 MPa under PWR full-scale conditions. In the range of medium gas volumetric fluxes, the calculated CCFL characteristics agreed well with the values calculated by the VOF method and the UPTF data at 1.5 MPa. This indicated that the reference set of the interfacial drag correlations employed in this study could be applied not only to low pressures but also to high pressures.

关键词： Reflux condensation PWR hot leg countercurrent flow numerical simulation two-fluid model.

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Numerical Simulations on countercurrent Gas-Liquid flow in a PWR Hot Leg with Air-Water flow in a 1/15th Scale-Model

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Journal of Energy and Power Engineering 2011年第6期5卷 495-503页

作者： N. Minami M. Murase Y. Utanohara I. Kinoshita A. Tomiyama Institute of Nuclear Safety System Inc. Fukui 9191205 Japan Graduate School of Kobe University Hyogo 6578501 Japan

To clarify the countercurrent flow in a PWR hot leg under reflux condensation, numerical simulations of countercurrent air-water flow for a 1/15th scale model of the PWR hot leg were conducted using the two-fluid model implemented in CFD software. In this paper, the effect of expansion of the inclined pipe, which is the actual plant geometry, was evaluated. When increasing the air velocity, CCFL characteristics and the mechanism of flow pattern transition had significant differences between the case with and without expansion of the inclined pipe. CCFL characteristics were mitigated in the case with expansion. The effect of computational grid size was also discussed. When the supplied water velocity was small, the predicted flow pattern transition point agreed well with the measured data by increasing the number of cells. On the other hand, when the air velocity was decreasing, there were no significant differences in each case.

关键词： Mid-loop operation reflux condensation countercurrent flow hot leg numerical simulation.

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TWO DIMENSIONAL SIMULATION OF WIND-DRIVEN CIRCULATION IN RESERVOIR

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Journal of Hydrodynamics 2003年第3期15卷 112-118页

作者： ChenJie-ren KhalilI.Othman CollegeofWaterResourcesandEnvironment HohaiUniversityNanjing210098China CollegeofEnvironmentEngineering HohaiUniversityNanjing210098China

The development of a simplified 2-D numerical model was described forwind-driven circulation in reservoir u-sing standard k-ε turbulence model to specify eddy viscositydistribution. The governing equations are transformed and solved on variable vertical grids, whichallows refinement at the surface and bottom boundaries. The results of the model simulation for floware compared with analytical solutions for laminar and turbulent flows, experimental data in awind-flume and wind wave tank. The sensitivity analysis results show that use of large number ofdepth layers increases the accuracy for the bottom counter-current flow. Prediction of surface driftwas not very sensitive to surface grid refinement. The model was also applied to Baisha reservoirfor an assumed wind condition and showed to be able to simulate the general features of surfacedrift and return flow under variable flow depth. The model can serve as alternative means ofstudying wind-driven flow beside experiments. It also reduced the problem complexity associated with3-D circulation models while faithfully reproducing the drift and near bottom return currents.

关键词： mathematical modeling wind-driven circulation surface drift countercurrent flow

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