|
[Sponsors] |
June 13, 2020, 13:04 |
Pressure profile in Velocity inlet
|
#1 |
New Member
Join Date: May 2020
Posts: 2
Rep Power: 0 |
Hi everyone,
I performed a DES simulation of a pipe flow discharging in an open domain like in figure. During the simulation, at the yellow interface; velocity, pressure, temperature, and turbulence profiles have been captured every 5 timestep using the command "write profile". Now I want to set the recorded profiles as unsteady inlet BC of a new (more complex) simulation. The BC type that I have chosen for the new simulation is "velocity inlet" so that i can set velocity components, temperature, Pressure and turbulence from recorded profiles. The problem is that actually I can't impose the static pressure at the velocity-inlet BC so the calculated static pressure is different from the recorded one and so the density and so the total mass flow rate. Any ideas on how I can set the pressure profile in a velocity inlet BC? [I have read the user guide and it seems impossible] (with mass flow inlet BC I'll have the problem of a wrong velocity profile) |
|
June 15, 2020, 08:24 |
Velocity and Pressure
|
#2 |
Senior Member
|
If you are using velocity inlet, it implies that the simulation is incompressible. And for an incompressible scenario, pressure is not important. It is only the pressure drop that is important. So, you should go ahead and apply velocity and turbulence field and forget about the pressure.
__________________
Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority. |
|
June 15, 2020, 08:42 |
|
#3 | |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,762
Rep Power: 66 |
Quote:
It's non-physical to specify both velocity and static pressure unless the flow is supersonic. Either way, you need the total pressure. It's too late now but you need to go back and record the total pressure (and total temperature) from your previous case. |
||
June 15, 2020, 09:30 |
|
#4 |
New Member
Join Date: May 2020
Posts: 2
Rep Power: 0 |
I recorded also total pressure. But also in this case if I use pressure inlet (imposing the total pressure) the problem remains
|
|
Tags |
compressible flows, pressure and velocity, profile, unsteady, velocity inlet |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
3d velocity profile at velocity inlet | swethaprakash | FLUENT | 3 | September 1, 2015 03:10 |
Why we normally provide velocity at inlet and pressure at outlet for pipe flow? | p07ip705 | Main CFD Forum | 3 | August 3, 2012 06:53 |
FSI- Pipe- uniform velocity profile inlet | Absy | Main CFD Forum | 0 | April 6, 2010 04:01 |
Pressure Inlet Velocity | prapanj | OpenFOAM | 11 | June 23, 2009 12:15 |
Terrible Mistake In Fluid Dynamics History | Abhi | Main CFD Forum | 12 | July 8, 2002 10:11 |