Perhaps someone has an answer to this problem I have. After running multiple flow simulations on a piping discharge from a relief valve the results show the gas velocity greater than mach 1, which cannot happen. See link below.
Here are the conditions I'm using:
-pipe size 3", discharge from 3" pipe after an elbow
-inlet pressure (initial condition): 1670 psi
-inlet temp (initial condition): 135F
-outlet static pressure (boundary condition): 14.7 psi
The resulting mach number at the exit is 4.3, using the high mach flow option.
I'm not sure if I have the boundary conditions setup incorrectly or what else I can change.
|Goal Name||Unit||Value||Averaged Value||Minimum Value||Maximum Value|
|Static pressure inlet||[lbf/in^2]||1498.37||1497.49||1496.98||1498.37|
|Static pressure outlet||[lbf/in^2]||14.70||14.70||14.70||14.70|
|Mach number outlet||[ ]||4.34||4.34||4.34||4.34|
I appreciate any feedback. I can send the solid models if anyone is interested.