The effects of large temperature variations on compressible flow over a heated cylinder

Flow over a cylinder with large temperature variations between the solid surface and the fluid flow is a strongly coupled heat transfer and fluid dynamics problem that arises in a variety of engineering applications. It is crucial to resolve all scales in the vicinity of a cylinder with direct numerical simulations (DNS) to comprehend the aerodynamics and heat transfer more accurately. This work studies the compressible flow over a heated cylinder with various temperature ratios between the cylinder surface and freestream flow at different Reynolds and Mach numbers using DNS. The representation of the cylinder boundary conditions is achieved by adding a ghost cell immersed body method to an in-house GPU-based Cartesian grid solver. Results from two-dimensional DNS show that an increase in the temperature ratio leads to a rise in the mean of the drag coefficient but a stabilization in its fluctuations. Moreover, increasing the Mach number decreases the heat transfer rate between the cylinder surface and fluid flow. We will also present the aerodynamic characteristics of the flow from the perspective of flow separation, vortex strength, shedding, and formation length.