The aero-thermal analysis of different shaped geometries in rarefied hypersonic flow fields are important and find applications in the design of devices to measure the hypersonic flow properties, elements of satellite systems, re-entry conditions etc. In this work, rarefied gas flow of Argon around a square cylinder is simulated using Direct Simulation Monte Carlo (DSMC) method. The simulation is carried out for different free-stream Knudsen number such as 0:002; 0:01; 0:05 & 0:25. The effect of angle of attack of the entry flow is also analyzed. The results such as variation of pressure, temperature, local Knudsen number and local Mach number in the flow domain, drag force, heat and location of the peak heat flux over the surface of square cylinder are presented and discussed in this work.

Keywords: Rarefied flow, Hypersonic flow, DSMC simulation, Square cylinder.