|
[Sponsors] |
July 22, 2012, 02:47 |
interfoam bc
|
#1 |
Member
Amin
Join Date: Mar 2012
Posts: 60
Rep Power: 14 |
Hi Foamers
i have problems with pressure boundary condition in interfoam yet. (openfoam 1.6) 1. what is P in interfoam? static or total or gage pressure? 2. what's the buoyantpressure condition? 3. does interfoam solve equations completely dimensionless? Regards |
|
July 26, 2012, 17:52 |
|
#2 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Hi Amin,
1. In 1.6 is static pressure. 2. Is a condition intended for walls where no pressure is known, the pressure gradient is set to the value of rho*g & wall_normal 3. No, the full dimensional equations are solved. Regards.
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar |
|
July 28, 2012, 16:51 |
|
#3 |
Member
Amin
Join Date: Mar 2012
Posts: 60
Rep Power: 14 |
Hi Santiago
Thanks for your reply. "" 3. No, the full dimensional equations are solved. "" you mean that we have to use exact properties for fluid and use meter in our simulation. |
|
July 28, 2012, 19:07 |
|
#4 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Hi, it means that the Eqns. are written the same you find in a book doing the mass and momentum balances without obtaining the dimensionless version. So that the velocities are in m/sec, pressure in Pa and viscosity in Pa sec (dynamic viscosity).
Regards.
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar |
|
July 29, 2012, 14:41 |
|
#5 |
Member
Amin
Join Date: Mar 2012
Posts: 60
Rep Power: 14 |
Thanks for your attention
my means was that if in simulation we want the Re=(u*d)/nu=180 , Can we set velocity(u), diameter(d) or nu in arbitary values to obtain Re=180 ? means: is simulation with u=180 m/s , d=1 m , nu=1 same with simulation with u=180*10^-6 , d=1 , nu=10^-6 ???? |
|
July 30, 2012, 15:54 |
|
#6 |
Senior Member
Santiago Marquez Damian
Join Date: Aug 2009
Location: Santa Fe, Santa Fe, Argentina
Posts: 452
Rep Power: 23 |
Amin, take into account that in multiphase flow you have other non-dimensional numbers, like Froude, Eotvos, Weber, etc. so that, in order to have similarity you have to check all the non-dimensional relevant numbers of you problem.
Regards.
__________________
Santiago MÁRQUEZ DAMIÁN, Ph.D. Research Scientist Research Center for Computational Methods (CIMEC) - CONICET/UNL Tel: 54-342-4511594 Int. 7032 Colectora Ruta Nac. 168 / Paraje El Pozo (3000) Santa Fe - Argentina. http://www.cimec.org.ar |
|
August 1, 2012, 07:15 |
|
#7 |
Member
Amin
Join Date: Mar 2012
Posts: 60
Rep Power: 14 |
yes Santiago. of course i do that.
thank you |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
interFoam / bubbleFoam to simulate an aerated tank | Meratb | OpenFOAM Running, Solving & CFD | 3 | November 6, 2020 12:45 |
InterFoam stops after deltaT goes to 1e14 | francesco_b | OpenFOAM Running, Solving & CFD | 9 | July 25, 2020 07:36 |
Segmentation fault in interFoam run through openMPI | voingiappone | OpenFOAM | 16 | November 2, 2011 07:49 |
Slow interFoam compared with other CFD tools? | Ralph M | OpenFOAM Programming & Development | 1 | November 17, 2010 07:46 |
Open Channel Flow using InterFoam type solver | sxhdhi | OpenFOAM Running, Solving & CFD | 3 | May 5, 2009 22:58 |