|
[Sponsors] |
August 15, 2011, 14:50 |
porous resistance
|
#1 |
Member
sajad
Join Date: Nov 2010
Posts: 51
Rep Power: 15 |
hi dear freinds.
im modelling a porous region and in the inlet i set a constant pressure.suddenly in decreased.so the mass flow decreased.i decreased the resistance of porous region by "CEL" expression to obtain the first flow rate with this new pressure.the resistance decreased but massflow is constant. what is the problem in my modelling? can any body guide me? best regards/ |
|
August 15, 2011, 19:51 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Can you describe what you are modelling, what the boundary conditions are and what you are trying to achieve?
|
|
August 16, 2011, 06:35 |
|
#3 |
Member
sajad
Join Date: Nov 2010
Posts: 51
Rep Power: 15 |
sure.
i modelling a tube with constant diameter that have a porous domain at the end.inlet and outlet "BC" are constant pressure.at inlet when time is less than 0.2 "P=4000pa" is applied and after that inlet pressure suddenly decreased to 1000pa.at outlet "P=100pa" and is fixed during whole simulation.when inlet pressure is 4000pa the porous resistance is fixed to 10.but when it decreased to 1000 i decreased the resistance to gain the flowrate that was following in tube by pressure inlet 4000.i mean at first inlet pressure was 40000 and resistance was10 and flowrate was q1 now the inlet pressure is 1000 resistance decreased and i want again q1. in the run after pressure decreased resistance decreased but flowrate is fix relative to p=1000 |
|
August 16, 2011, 07:45 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Is it compressible or incompressible?
If you want to control the flow rate then why don't you use a mass flow boundary condition? |
|
August 16, 2011, 08:48 |
|
#5 |
Member
sajad
Join Date: Nov 2010
Posts: 51
Rep Power: 15 |
it is incompressible.
my B.Cs are presure so i can not use massflow. i change the resistance of porous domain manualy 10,9,8,5,0.but massflow didnt change.so i think i define porous in wrong way. could you give me a refrence or an example of modelling porous in CFX.? thanks for your replying |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Multiphase Porous Media Flow - Convergence Issues | VT_Bromley | FLUENT | 7 | May 14, 2020 17:34 |
Viscous resistance coefficients in porous medium | fpingqian | FLUENT | 50 | June 26, 2019 02:55 |
porous inertial resistance | Lukas | STAR-CCM+ | 21 | March 7, 2012 03:05 |
influence of porous zone in particel resistance time using Euler-Lagrange and DPM ?! | Wikie | FLUENT | 0 | April 23, 2010 07:07 |
Flow resistance of porous media | Desheng Kong | Main CFD Forum | 3 | December 19, 2000 12:07 |