|
[Sponsors] |
Correct Inlet Boundary Condition at Pressure Vessel |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 8, 2020, 05:15 |
Correct Inlet Boundary Condition at Pressure Vessel
|
#1 |
Member
Simon
Join Date: Sep 2019
Location: Germany
Posts: 51
Rep Power: 7 |
Hello everyone,
I want to simulate the stream jet out of a pressure vessel. The vessel has a small valve where the jet comes out. This valve is the Inlet of the simulation. My problem is to find the correct inlet-boundary-condition. The vessel has for example a dp of 10 bar to the outside. And it is large enough that the pressure inside is not doping when opening the valve for a short time. I have two options: static-pressure-inlet-condition 10 bar or total-pressure-inlet-condition 10 bar? Which one is the correct one? Thank you, Simon Last edited by SimonStar; December 8, 2020 at 08:05. |
|
December 8, 2020, 19:51 |
|
#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,754
Rep Power: 66 |
Total pressure is technically more correct but you might find that it really doesn't affect the flow much whichever one you use.
|
|
December 9, 2020, 14:52 |
|
#3 |
Member
Simon
Join Date: Sep 2019
Location: Germany
Posts: 51
Rep Power: 7 |
Thank you very much for answering, Lucky Tran. It helped me very much!
I just have one more question: I made the total-pressure-inlet-condition in my simulation. What I see now is that the velocity is very high right after the valve (up to 800m/s). This is normal I guess. But the total pressure is rising in this area about 50%. Is this also normal? What makes me thinking is the following: The total pressure normally stays at the same level (except friction issues) while the static and dynamic pressure are varying. So how can it increase right after the inlet? Thank you again, Simon |
|
Tags |
boundary condition, inlet, pressure, vessel |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Inlet & outlet both pressure boundary condition | shouvik ghorui | OpenFOAM | 5 | November 1, 2022 05:39 |
sliding mesh problem in CFX | Saima | CFX | 46 | September 11, 2021 08:38 |
Error - Solar absorber - Solar Thermal Radiation | MichaelK | CFX | 12 | September 1, 2016 06:15 |
Basic Nozzle-Expander Design | karmavatar | CFX | 20 | March 20, 2016 09:44 |
Moving mesh | Niklas Wikstrom (Wikstrom) | OpenFOAM Running, Solving & CFD | 122 | June 15, 2014 07:20 |