摘要: Computational fluid dynamics (CFD) is being used to predict the thermal- hydraulic performance of the liquid mercury target for the Spallation Neutron Source (SNS). Features in the liquid mercury flow through the target present pr... 展开 Computational fluid dynamics (CFD) is being used to predict the thermal- hydraulic performance of the liquid mercury target for the Spallation Neutron Source (SNS). Features in the liquid mercury flow through the target present problems to the credibility of the simulated results because the turbulence models and wall functions have not been validated for these flow conditions. Discussion is presented in this paper of the plan for establishing the relevance of the CFD simulations to the SNS target. Some of the tasks proposed as a part of this plan have been completed, some (such as the three experimental loops) are currently underway, and some have yet to be performed. The SNS is a high-power accelerator-based pulsed spallation source being designed by a multi laboratory team led by Oak Ridge National Laboratory (ORNL) to achieve high fluxes of neutrons for scientific experiments. In addition to thermal shock and materials compatibility, the thermal-hydraulic performance of the target is an important issue in prolonging the life of the target. Present uncertainty in the application of turbulence models and wall functions typically used in CFD. To build confidence in the analyses, three experiments are currently underway which will provide validation data for various aspects of the CFD model. 收起