3D AGR Fuel Element

Authors: A. Keshmiri

Type: Numerical

Status: tip

Contents

Description

Flow Parameters

Reference Publications

Results

Description

Generally, in a 36-fuel pin passage (representing a complete AGR fuel element), three different sub-channels (defined as the area surrounded by fuel pins) exist including triangular, square, and wall sub-channels. This makes the simulations conducted using simple 2D channels or even triangular or square sub-channels dubious. Therefore, 3-dimensional simulations of a fuel element are required to capture possible interactions among different fuel pins and sub-channels, in addition to computing the pressure, temperature and velocity distributions across the whole fuel element’s cross-section. Therefore, this test case consists of a simplified design of an AGR fuel element and it is simulated using a 3-dimensional approach.

Present Configuration: a) fuel pin b) rib profile c) minimum section required to be simulated
2d-rib.JPG

Boundary Conditions
2d-rib.JPG

Dimensions
2d-rib.JPG

Mesh
2d-rib.JPG

Flow Parameters

Taking advantage of azimuthal symmetry of a complete fuel element in order to reduce the computational requirements, the present simulation employed a symmetry boundary condition on the two azimuthal faces and computed the flow in only a 30° sector of the circular cross section. Streamwise periodic boundary condition maintaining a constant mass flow rate and constant bulk temperature was applied at the top and bottom faces of the domain. The computational domain was chosen to be of length 2P (i.e. 0.0042m) in the streamwise direction to include 2 complete ribs. The latter length combined with a streamwise periodic boundary condition was found to be sufficiently long for the attainment of fully developed flow. Temperature in the present computations is solved as a passive scalar. The thermal boundary conditions at all ribbed walls consist of the same uniform wall heat flux, while both the guide-tube and outer graphite sleeve faces were set as adiabatic walls. The results presented here were generated using the v2-f model implemented in the commercial CFD code, STAR-CD.

Dimensions
2d-rib.JPG


Additional information (links, pictures, etc.)

Reference Publications

Keshmiri, A., 2010. Thermal-hydraulic analysis of Gas-cooled reactor core flows, Ph.D. thesis, School of Mechanical, Aerospace and Civil Engineering, University of Manchester, UK.

Results

Simulation results available for this case:
Number of topics: 0

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Topic attachments
I Attachment Action Size Date Who Comment
jpgJPG bc.JPG manage 62.6 K 2010-07-05 - 08:38 AmirKeshmiri  
jpgJPG dimensions.JPG manage 44.4 K 2010-07-05 - 08:38 AmirKeshmiri  
jpgJPG dimensions_3configs.JPG manage 154.4 K 2010-07-05 - 08:44 AmirKeshmiri  
jpgJPG mesh.JPG manage 94.2 K 2010-07-05 - 08:38 AmirKeshmiri  
jpgJPG present_config.JPG manage 53.3 K 2010-07-05 - 08:38 AmirKeshmiri  
Topic revision: r2 - 2013-12-09 - 17:10:56 - StephanePreau
 

Computational Fluid Dynamics and Turbulence Mechanics
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