|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Humberto
Join Date: Nov 2011
Posts: 5
Rep Power: 14 ![]() |
Hello everybody, I am using pisoFoam to run an external flow over an obstacle, I can not understand the units field in the tutorials where p has dimensions of [0 2 -2 0 0 0 0] instead of what I would expect [1 -1 -2 0 0 0 0].
can anybody point me in the right direction? Thanks. |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 22 ![]() |
The equations are solved for p/rho, so that rho only appears in the kinematic viscosity. This explains the different units.
|
|
![]() |
![]() |
![]() |
![]() |
#3 |
New Member
Humberto
Join Date: Nov 2011
Posts: 5
Rep Power: 14 ![]() |
Thanks for replying so fast Bernhard,
so the results I get for pressure need to be multiplied by rho to make them Pascals? żdoes it make a difference if I declare units of [1 -1 -2 0 0 0 0] ? |
|
![]() |
![]() |
![]() |
![]() |
#4 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 22 ![]() |
Yes, then they will be pascals, but be certain from the source code if it is indeed the kind of pressure you think it is.
If you change the units, the dimensions for the different terms are inconsistent. This will throw you a fatal error. |
|
![]() |
![]() |
![]() |
Tags |
units |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
question about uds | tanven | FLUENT | 2 | July 5, 2015 11:22 |
units in OpenFOAM | megacrout | OpenFOAM | 4 | July 19, 2011 08:04 |
internal field question - PitzDaily Case | atareen64 | OpenFOAM Running, Solving & CFD | 2 | January 26, 2011 15:26 |
Question about Table applicaiton. | universez | OpenFOAM Running, Solving & CFD | 0 | January 12, 2010 20:31 |
Poisson Solver question | Suresh | Main CFD Forum | 3 | August 12, 2005 04:37 |