spatial non uniform boundary conditions

pepe.aero · October 26, 2012, 11:53

Hi all,

i'm looking for the proper way in order to assign spatially non-uniform boundary condition at the inflow side. For example, a parabolic velocity profile varying along z (vertical) axis.
The condition is steady in time.
Can anyone give me a suggestion about what is the best type of BCs to choose in order to do it?

Thanks all for the support.

Regards,

Andrea

ngj · October 29, 2012, 04:34

Hi Andrea,

In that case, I would suggest that you start by looking at swak4Foam, where you can specify e.g. algebraic expressions: http://openfoamwiki.net/index.php/Contrib/swak4Foam .

If you search for swak4Foam on the forum, you will find many threads describing its usage.

Kind regards,

Niels

pepe.aero · October 29, 2012, 13:42

Hi Niels,

thank you for your reply.
In fact, I'm taking a look to skaw4foam...but it's not clear to me if is possible to assign non uniform condition by points (and then the solver interpolates the velocity profile in the missing points) or just by algebrical expressions.
Can you answer to this question?

Thanks you so much for your support.

Regards,

Andrea

ngj · October 29, 2012, 15:41

Hi Andrea,

No, I have never used swak4Foam.

Good luck,

Niels

duongquaphim · November 12, 2012, 10:29

I think groovyBC is quite a good tool for this purpose (http://openfoamwiki.net/index.php/Contrib_groovyBC). I used that before and it works well.

Duong

October 26, 2012, 11:53	spatial non uniform boundary conditions	#1
pepe.aero New Member Join Date: Apr 2011 Posts: 28 Rep Power: 15	Hi all, i'm looking for the proper way in order to assign spatially non-uniform boundary condition at the inflow side. For example, a parabolic velocity profile varying along z (vertical) axis. The condition is steady in time. Can anyone give me a suggestion about what is the best type of BCs to choose in order to do it? Thanks all for the support. Regards, Andrea

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October 29, 2012, 04:34		#2
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Hi Andrea, In that case, I would suggest that you start by looking at swak4Foam, where you can specify e.g. algebraic expressions: http://openfoamwiki.net/index.php/Contrib/swak4Foam . If you search for swak4Foam on the forum, you will find many threads describing its usage. Kind regards, Niels

October 29, 2012, 13:42		#3
pepe.aero New Member Join Date: Apr 2011 Posts: 28 Rep Power: 15	Hi Niels, thank you for your reply. In fact, I'm taking a look to skaw4foam...but it's not clear to me if is possible to assign non uniform condition by points (and then the solver interpolates the velocity profile in the missing points) or just by algebrical expressions. Can you answer to this question? Thanks you so much for your support. Regards, Andrea

October 29, 2012, 15:41		#4
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Hi Andrea, No, I have never used swak4Foam. Good luck, Niels

November 12, 2012, 10:29		#5
duongquaphim Member Duong A. Hoang Join Date: Apr 2009 Location: Delft, Netherlands Posts: 93 Rep Power: 17	I think groovyBC is quite a good tool for this purpose (http://openfoamwiki.net/index.php/Contrib_groovyBC). I used that before and it works well. Duong