Abstract
Three-dimensional computational fluid dynamics (CFD) method was used to model the boiling two-phase flow in one of the PSBT 5-by-5 rod bundle tests. The rod bundle with all the spacers was modeled explicitly using unstructured computational grids. The six-equation, two-fluid model with the wall boiling model was used to model the boiling two-phase flows in the bundle. The computed void fractions compare well with the measured data at the measuring plane. In addition to the averaged void data, the CFD results give a very detailed picture of the flow and void distributions in the bundle and how they are affected by solid structures in the flow paths such as the spacer grids and mixing vanes.
Highlights
In the Nuclear Power Engineering Corporation (NUPEC) PWR Subchannel and Bundle Test (PSBT) International Benchmark exercise [1], valuable measured data were made available to test and check the accuracy of numerical simulations of boiling two-phase flows in PWR subchannels and rod bundles
The measured data released by Japan Nuclear Energy Safety (JNES) organization [2] were obtained by the Nuclear Power Engineering Corporation (NUPEC) in Japan who in the period between 1987 and 1995 performed a series of void measurement tests using full-size mock-up tests for both BWRs and PWRs
This paper describes the use of three-dimensional computational fluid dynamics (CFD) to model the boiling two-phase flows in one of the 5-by-5 rod bundle tests
Summary
In the NUPEC PWR Subchannel and Bundle Test (PSBT) International Benchmark exercise [1], valuable measured data were made available to test and check the accuracy of numerical simulations of boiling two-phase flows in PWR subchannels and rod bundles. This paper describes the use of three-dimensional computational fluid dynamics (CFD) to model the boiling two-phase flows in one of the 5-by-5 rod bundle tests. The rod bundle with all the spacers was modeled explicitly using unstructured computational grids. A brief description of the computational grid is given in Section 2 of the paper. In addition to the averaged void data, the CFD results give a very detailed picture of the flow and void distributions in the bundle and how they are affected by solid structures in the flow paths such as the spacer grids and mixing vanes
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