In the absence of viscosity, the pressure forces acting to retard the vehicle are canceled by a pressure force further aft that acts to push the vehicle forward this is called pressure recovery and the result is that the drag is zero. The viscosity of the fluid has a major effect on drag. The nature of these normal forces combines shock wave effects, vortex system generation effects, and wake viscous mechanisms. R e = v D ν = ρ v D μ, , due to pressure distribution acting on the body.
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