Computational Fluid Dynamic (CFD) numerical simulations were performed for the flow inside the Spallation Neutron Source jet-flow target vessel at Oak Ridge National Laboratory. Different flow rates and beam conditions were tested to cover all the functioning range of the target, but for brevity, only the nominal case with a mass flow rate of 185 kg/s and a beam power of 1.54MW is presented here. The heat deposition rate from the proton beam was computed using the general-purpose Monte Carlo radiation transport code MCNPX and the commercial CFD code ANSYS-CFX was used to determine the flow velocity in the mercury and the temperature fields in both the mercury and the stainless steel vessel. Boundary conditions, turbulence model and mesh effects are presented in depth. To validate the numerical approach, Particle Imagery Velocimetry (PIV) measurements on a water-loop setup with an acrylic jet-flow target mock-up were performed and compared to the numerical simulations. It was found that a sustained wall jet was developed across the whole length of the vulnerable surface, confirming the good design of the jet-flow target. Overall, good agreements were observed between the experiments and the simulations: the velocity contours and the shape of the recirculation zone near the side baffle are qualitatively similar. However, some differences were also observed that underlines the shortcomings of both the numerical simulations and the experimental measurements.
Numerical and Experimental Investigation of the Flow in the SNS Jet Flow Target
Barbier, C, Wendel, M, Felde, D, & Daugherty, MC. "Numerical and Experimental Investigation of the Flow in the SNS Jet Flow Target." Proceedings of the ASME 2015 International Mechanical Engineering Congress and Exposition. Volume 7B: Fluids Engineering Systems and Technologies. Houston, Texas, USA. November 13–19, 2015. V07BT09A033. ASME. https://doi.org/10.1115/IMECE2015-51910
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