COMPARISON OF RELAP5-3D/ATHENA AND ANSYS/FLOTRAN THERMAL - HYDRAULIC RESULTS

摘要

A heat exchanger for a space reactor has been modeled by the codes RELAP5-3D/ATHENA (Ref. 1) and ANSYS/FLOTRAN (Ref. 2), and some thermal-hydraulic results have been compared with reasonably good agreement. The purpose of this comparison is to evaluate the ability to represent components designed and analyzed using coupled multiphysics tools like ANSYS/FLOTRAN and RELAP5-3D/ATHENA as part of an overall system analysis. If the components represented in RELAP5 match the performance predicted by ANSYS, then it is possible to accurately represent component performance in a broader system analysis, which may consist of a combination of many components developed with multiphysics tools. This will permit system analysis to be performed using more appropriate transient system analysis tools with control volumes representative of the detail designs. The important performance parameters to match are the total heat transferred within the component and the pressure drop across the component.