Direct numerical simulation (DNS) of a hypersonic compressible flow over a blunt wedge with fast acoustic disturbances in freestream is performed. The receptivity characteristics of boundary layer to freestream pulse acoustic disturbances are numerically investigated at Mach 6. and the frequency effects of freestream pulse wave on boundary layer receptivity are discussed. Results show... https://www.halohealthcarers.shop/product-category/protective-clothing/