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Evaluation of Computational Fluid Dynamics Code CFX byNumerical Simulations of Fundamental and Rod Bundle Flows
SUMMARY
1. Project Title
Evaluation of Computational Fluid Dynamics Code CFX by Numerical Simulations of
Fundamental and Rod Bundle Rows
2. Objective and Importance of the Project
This study performed the numerical analyses of the fundamental flow problems and the
rod bundle flow problems to evaluate the CFX code. The numerical analyses were
useful to understand the turbulent structure of the rod bundle flow as well as the
characteristics of CFX. The result of this study is therefore expected to provide a guide
for the numerical simulation of the complex flow in rod bundle with grid spacer, on
which the flow mixing devices (CHF promoters) are attached.
3. Scope and Contents of the Project
Four fundamental flow problems and two flow problems in rod bundles were selected
to examine the effects of computational grid, numerical scheme, flow model and
boundary conditions. The lengths of flow separation and reattchment in the backward
facing step flow were compared for the various Reynolds numbers. The generation and
decay of vortex were also examined for the uniform flow past a circular cylinder and a
square cylinder. The characteristics in pipe turbulent flow were investigated depending
on the computational grid and the turbulence model. The CFX predictions of the
turbulent flows in 3x3 rod bundle and hi four rodded wall channel were compared with
their experimental results.
4. Results and Proposal for Application
This study enhanced the understanding of the CFX code and investigated the
sensitivities of the computational grid, the numerical scheme and the turbulence model.
Since the CFD analysis of the turbulent flow in rod bundle takes less time and cost than
the experimental approach, the CFX application is very useful to optimize the designs
of a nuclear fuel spacer and a flow mixing device.
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BIBLIOGRAPHIC INFORMATION SHEET
Performing Org.
Report No.
Sponsoring Org.
Report No.
Standard
Report No.INIS Subject Code
KAERI/TR-1182/98
Title / Subtitle
Evaluation of Computational Fluid Dynamics Code CFX by
Numerical Simulations of Fundamental and Rod Bundle FlowsProject Manager
and DepartmentIn Wang Kee (Fuel Design Technology Development)
Researcher and
Department
Oh Dong Seok (Fuel Design Technology Development)Chun Tae Hyun (Fuel Design Technology Development)
PublicationPlace
Taejon Publisher KAERIPublication
Date1998
Page 30 p. 111. & Tab. Yes( o ), No ( ) Size19x26 Cm.
Note
Classified Open( o ), Restricted(. Class Document
Report Type TR
Sponsoring Org. Contract No.
Abstract (15-20 Lines)
Four fundamental flow problems and two flow problems in rod bundles were selected toexamine the effects of computational grid, numerical scheme, flow model and boundaryconditions. The lengths of flow • separation and reattchment in the backward facing ; stepflow were compared for the various Reynolds numbers. The generation and decay ofvortex were also examined for the uniform flow past a circular cylinder and a squarecylinder. The characteristics in pipe turbulent flow were investigated depending on thecomputational grid and the turbulence model. The CFX predictions of the turbulent flowsin 3x3 rod bundle and in four rodded wall channel were compared with theirexperimental results.
Subject Keywords(About 10 words)
Computational Fluid Dynamics, CFX, Computational Grid,
Numerical Scheme, Turbulence Model
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