Development of an Euler-Euler two-phase model for application in the windowless XT-ADS spallation target design

An Eulerian-Eulerian two phase CFD (Computational Fluid Dynamics) method is developed for the simulation of an LBE (Lead Bismuth Eutectic) free surface in an experimental Accelerator Driven System: XT-ADS with windowless target configuration. In this configuration there is direct contact between the proton beam from the accelerator and an LBE free surface flow. For this purpose, the MYRRHA double gap 16.5 degrees feeder design is selected. The simulation results are compared to real size water, mercury, and LBE flow experiments which have been performed for the same design in different facilities. The simulation shows a good agreement with the experimental results. Future developments of the method will include: swirl effects in combination with a free surface, the modelling of the flow detachments which are found in water and LBE experiments, the three dimensional 3-feeder design, and removal of the deposited heat in the LBE free surface flow. (authors)