In the paper, the results of numerical simulation of a supersonic laminar flow past a fin-body junction are presented. The gas-dynamic and vortex structure of the flow, determined by viscous-inviscid interaction, is analyzed. Numerical data showing the qualitative and quantitative effects on the flow structure and heat transfer of the following parameters: Mach number, Reynolds number, temperature factor and plate length, are presented

Results of numerical simulation of supersonic flow past a blunt fin mounted on a plate with a developing laminar boundary layer are presented. Generally, the case considered corresponds to the flow configuration used in the experimental and computational study by Tutty et al (2013), where the laminar air flow with the freestream Mach number of 6.7 is considered. The simulation was performed for different values of Reynolds number ranging from 5000·to 20000. Two stable solutions corresponding to metastable flow states with different configurations of the vortex structure were predicted within some range of Reynolds number. The bifurcation diagrams showing the main horseshoe vortex center location and the length of separation region versus the Reynolds number is presented, critical Reynolds number corresponding to occurrence of the second isolated solution is evaluated.