stagnation pressure in transient flow simulation

K.S.Ravichandran

Hi

While simulating transient flow in blow-down wind tunnel geometry, I noticed wall static pressures nearly double the upstream stagnation pressure. I know that the energy equation in terms of total enthalpy shows that the latter is proportional to the time derivative of the pressure and hence particle enthalpy can exceed its upstream stagnation value during motion. Is there a similar equation for stagnation pressure? what is a simple intuitive physical explanation of pressure being higher than stagnation pressure?

KSR