Investigation of the inclination angles of wall-attached eddies for streamwise velocity and temperature fields in compressible turbulent channel flows

This work explores the streamwise inclination angle of attached eddies in both the streamwise velocity and temperature fields using direct numerical simulations of turbulent channel flows. Though it has been well studied in incompressible flows, scarce work exists in compressible flows. A high statistical similarity is found between the velocity and temperature fluctuations. The increasing trend of the inclination angle with Reynolds numbers observed in incompressible flows remains. On the contrary, the current database shows a minor Mach-number effect on it. These conclusions could serve as references for extending the attached eddy model from incompressible to compressible flows.