A numerical prediction on the turbulent flow in closely spaced bare rod arrays by a nonlinear k−ϵ model

Lee, Kye Bock; Jang, Ho Cheol

doi:10.1016/s0029-5493(97)00001-0

Cited by 50 publications

(8 citation statements)

References 11 publications

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“…It was clearly shown that utilization of anisotropic eddy diffusivity models is necessary to simulate the flow behavior in rod bundles. These findings were also confirmed by other authors (Rapley and Gosman, 1986;In et al, 2003;Lee and Jang, 1997). Most of the numerical studies reproduced secondary flow, but they showed large difference in amplitude.…”

Section: Introductionsupporting

confidence: 87%

CFD analysis of thermal–hydraulic behavior of heavy liquid metals in sub-channels

Tak

2006

Nuclear Engineering and Design

108

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Section: Introductionsupporting

confidence: 87%

CFD analysis of thermal–hydraulic behavior of heavy liquid metals in sub-channels

Tak

2006

Nuclear Engineering and Design

108

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“…The grid cells are getting smaller gradually and analyzing the result of each calculation. Compared with the previous calculation result, as two calculation results were within 5%, the grids will be adopted to ensure both accuracy and convergence [16][17][18], and 511250 hexahedral grid cells were generated for CPR 1000, 546596 for EPR1000, and 601942 for AP1000. The overall grid quality is between 0.6 and 1, and the aspect ratio is 1.2∼18, which meets the requirement that maximum aspect ratio of three-dimensional heat transfer calculation is less than 35:1.…”

Section: Mesh Generation Methodologiesmentioning

confidence: 99%

Research of PWR Pressurizer Insurge Characteristics on Three-Dimensional Transient Modeling

Liu

Zhang

Shi

et al. 2018

Science and Technology of Nuclear Installations

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In order to study the evolution process and hydraulic characteristics of pressurizer insurge in CPR1000 pressurized water reactor (PWR), the computational fluid dynamics (CFD) of three-dimensional unsteady heat transfer was used to capture the temperature and velocity fluctuation intensity of the mixing of the hot and cold. The results show that Realizable k–ε Turbulence Model combined with VOF multiphase heat transfer model can effectively predict the development trend of pressurizer insurge process. The small diameter pressurizer surge line of CPR1000 enhances the intensity of velocity fluctuation. From the essence of flow and heat transfer, it is concluded that buoyancy force can increase the degree of fluctuation and make an accelerated effect on the influx cold fluid. The electric heater inside the pressurizer should be arranged as far as possible in z<-0.45m and z>0.45m; it is beneficial to improve its harsh operating environment. This research can provide reference for the structural design of pressurizer and the layout optimization of the electric heater.

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“…Various numerical schemes have been employed in the literature to solve three-dimensional unsteady flow problems. Lee and Jang (1997) investigated the turbulent flow in an array of bare elements by solving the Reynolds Averaged Navier-Stokes (RANS) equations, in conjunction with the non-linear k-ε method. Suh and Lightstone (2004) concluded that the k-ε method is unable to predict secondary flows inside complex subchannel areas in element-bundle geometry.…”

Section: Approach With Computational Fluid Dynamicsmentioning

confidence: 99%

Investigations on Flow and Flow-Induced Vibration of CANDU Fuel Bundles

Bhattacharya¹

2023

Preprint

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Excitations induced by three-dimensional unsteady flows of ordinary water coolant through a string of CANDU fuel bundles in a fuel channel are investigated in this thesis. Several comprehensive computational fluid dynamics (CFD) models are developed and solved by means of large eddy simulation (LES), high performance computers and parallel processing scheme. The 12-bundle flow model is the first ever developed concerning flow in a very complex CANDU fuel channel. The lateral fluid flow and flow-induced excitations on every fuel bundle are obtained and analyzed for various combinations of bundle angular positions. The coherent nature of the flow through the multiple bundles inside the fuel channel exhibiting fluid excitations of frequencies spreaded over a wide band in the power spectra is a source of bundle lateral vibration. The flow features of different bundle regime are correlated both in time and frequency domain and they are sensitive to the bundle-to-bundle angular position. This finding directs that, to study the flow and flow-induced excitations and vibrations of a bundle string, it is necessary to include all bundles for fluid-structure interactions. Results from the computational model reveal that the misaligned interface changes the flow pattern in the fuel channel. The mean lateral fluid forces increase by an order of magnitude and their RMS values raise about 3 to 4 times at some configurations compared to fully aligned situation. Experiments are also performed using the simulated CANDU bundles in an out-reactor setup to verify the computational results. An analysis of a complete fuel channel of a nuclear reactor using LES is at the forefront of current research worldwide and this study is a major step forward towards understanding and unfolding the fuel bundle vibration phenomenon.

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A numerical prediction on the turbulent flow in closely spaced bare rod arrays by a nonlinear k−ϵ model

Cited by 50 publications

References 11 publications

CFD analysis of thermal–hydraulic behavior of heavy liquid metals in sub-channels

CFD analysis of thermal–hydraulic behavior of heavy liquid metals in sub-channels

Research of PWR Pressurizer Insurge Characteristics on Three-Dimensional Transient Modeling

Investigations on Flow and Flow-Induced Vibration of CANDU Fuel Bundles

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