Home > Forums > General Forums > Main CFD Forum

Why am I seeing supersonic flow when pressure is below 10psig

Updated Threads

Search this Thread

Prev

Previous Post

Next Post

Next

July 5, 2020, 13:38	Why am I seeing supersonic flow when pressure is below 10psig	#1
MachZero Member Join Date: Aug 2011 Posts: 89 Rep Power: 14	I have a simulation where I have a stagnation tank that I pressurize to 10 psi above atmospheric. This stagnation tank is effectively a long tube. At one end it is closed and at the other it is open to atmosphere by a nozzle. The nozzle is a Converging diverging nozzle that’s very simple. I Initialize the simulation with 10 psi Inside the tube. When I run the simulation I get supersonic flow at Mach 1.2 in the nozzle. Shouldn’t this be inpossible since My pressure isn’t high enough? Or is there some weird transient effect that could be casing this. This is meant to represent a quick nozzle opening.

Tags

nozzle, supersonic

« Previous Thread | Next Thread »

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are Off Pingbacks are On Refbacks are On Forum Rules

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Pressure Driven Supersonic Flow in Coverging-Diverging Nozzle (Wind Tunnel)	shang2	OpenFOAM Running, Solving & CFD	1	March 1, 2019 04:56
BC for Actuator Disk - Flow Vel from High Pressure to Low Pressure	vinguva	OpenFOAM Running, Solving & CFD	2	March 7, 2016 23:46
static vs. total pressure	auf dem feld	FLUENT	17	February 26, 2016 13:04
Boundary conditions for flow in nozzle	kgevers	FLUENT	0	July 26, 2015 12:46
Hydrostatic pressure in 2-phase flow modeling (long)	DS & HB	Main CFD Forum	0	January 8, 2000 15:00

All times are GMT -4. The time now is 03:05.