|
[Sponsors] |
Running simulation until certain condition is reached |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
September 19, 2011, 07:20 |
Running simulation until certain condition is reached
|
#1 |
New Member
Benjamin
Join Date: Sep 2011
Posts: 11
Rep Power: 14 |
Dear all,
I have looked through the tutorials and made some searching on the net, but I couldnt find a solution to my problem: Lets say I have a bottle with just one outlet (static pressure; 1 atm/Bar) and a steady state analysis type. The pressure in the bottle is set to e.g. 10 Bar (e.g. ideal gas or Redlich/Kwong CH4) and I want to know the physical time passing by when the gas exhausts through the bottleneck. Do I have to set a monitor point of some kind? How do I set the solver control, so that the run finish automatically if the interior pressure reaches the static pressure from the BC? Any hint would be greatly appreciated, Thanks in advance! Ben |
|
September 19, 2011, 07:38 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I do not know the details of what you are modelling but it does not sound like a steady state model. You need to model this transient. Alternately, you may be able to do a series of steady state runs are various pressures (assuming the pressure drop all occurs at the exit) and then use a simple control volume solver to work out the pressure versus time.
|
|
September 19, 2011, 08:03 |
|
#3 |
New Member
Benjamin
Join Date: Sep 2011
Posts: 11
Rep Power: 14 |
Thanks for your answer, that sounds reasonable. I try both ways, the extrapolation from various stready state runs and the transient approach.
Thanks again for the quick reply! Ben |
|
September 19, 2011, 19:04 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I did not propose an extrapolation from steady state runs. I proposed a psuedo-steady state approach where you assume the transient flow can be represented by a series of steady state conditions.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
GUI crash and simulation engine still running | RPJones | FLOW-3D | 2 | November 9, 2010 08:18 |
how to set up a wall boundary condition according to calculated wall shear stress? | gameoverli | OpenFOAM Pre-Processing | 1 | May 21, 2009 08:28 |
Boundary condition, UDF, Wave simulation | hm | FLUENT | 0 | August 2, 2004 21:45 |
2D simulation as boundary condition for 3D problem | Jan De smet | FLUENT | 1 | October 11, 2002 02:02 |
3-D Contaminant Dispersal Simulation | Apple L S Chan | Main CFD Forum | 1 | December 23, 1998 10:06 |