An overview of the ongoing efforts in the area of the thermal hydraulics modeling of a Molten Salt Fast Reactor (MSFR) is presented. The MSFR employs a owing liquid fuel based on a high temperature lithium uoride salt. A molten salt ow can be considered in many situations as an incompressible ow. However, several phenomena intrinsic to a molten salt ow pose unique challenges (radiative heat transfer, volumetric heat source, strong neutronics feedbacks, etc.). To study some of these phenomena and to improve current Computational Fluid Dynamics (CFD) models an experimental facility called SWATH (Salt at WAll: Thermal ExcHanges) will be built as part of the European project SAMOFAR (2015-2019).