CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Cyclic jump boundary condition (http://www.cfd-online.com/Forums/openfoam-solving/58455-cyclic-jump-boundary-condition.html)

hjasak March 9, 2008 08:01

Dear All, I have recently i
 
Dear All,

I have recently implemented a cyclic jump boundary condition during work with a client. This allows you to have a cyclic geometry and specify a jump between the patches across it from the "left" to the "right" side.

In order to parallelise this properly, I need to go through some pain and re-organisation (the cyclic condition itself was trivial). So, before I do that, I'd like to hear a word from the Forum - sounds very Roman http://www.cfd-online.com/OpenFOAM_D...part/happy.gif

Do you think this is useful/do you need it or intend to use it?

In case of decent response, I'll spend 2-3 days to wrap this up properly and sort out the parallelisation, domain decomposition etc.

Looking forward to hearing from you all,

Hrv

stephan March 9, 2008 16:53

hi, great! i am certainly i
 
hi,

great! i am certainly interested and would appreciate it a lot.
would it be posibble to define the "jump" as a function of calculated fields?
thanks in advance for your work!
best regards
stephan

alberto March 10, 2008 00:49

Add a vote from me :-) Than
 
Add a vote from me :-)

Thanks!
Alberto

olesen March 10, 2008 03:59

This could be useful for simul
 
This could be useful for simulating porous baffles. It'd be interesting to see how much the solution oscillates with higher resistances.

gschaider March 10, 2008 07:53

Hi Hrv! Yes. That would be
 
Hi Hrv!

Yes. That would be very interesting. In fact I'm working on something similar (porous jump) for a customer of ours. Would be interested how you did it (==how it should be done)

Bernhard

nishant_hull March 10, 2008 11:24

I need it for some repeating s
 
I need it for some repeating structure for LES simulation.
take my vote for it as well.

Nishant

suredross May 9, 2008 04:23

i will need it for my thesis w
 
i will need it for my thesis work as well.i'm all up for it!

davey

suredross May 23, 2008 04:18

Hi Jasak, are you done with t
 
Hi Jasak,
are you done with the cyclic jump boundary condition?if yes,where can i access it?i am in dire need of some help!

thanx
davey

mou_mi September 11, 2008 16:20

Hi I am intersted to test
 
Hi

I am intersted to test the jump cyclic boundary condition in OF1.5 and I did a test. here is what I did;
I made a block by blockMesh:
patches
(
wall maxY
(
(3 7 6 2)
)
wall minY
(
(1 5 4 0)
)
cyclic X
(
(2 6 5 1)
(0 4 7 3)
)
wall Z
(
(0 3 2 1)
(4 5 6 7)
)
);

Then I changed the boundary file and adjust the initial files like:
--------U
maxY
{
type fixedValue;
value uniform (0 0 0);
}
minY
{
type fixedValue;
value uniform (0 0 0);
}
X
{
type jumpCyclic;
value uniform (0 0 0);
}
Z
{
type fixedValue;
value uniform (0 0 0);
}

------------p
maxY
{
type zeroGradient;
}
minY
{
type zeroGradient;
}
X
{
type jumpCyclic;
value uniform 0;
}
Z
{
type zeroGradient;
}

then here if the run with "icoFoam" solver:

Create time

Create mesh for time = 0

Reading transportProperties

Reading field p

Reading field U

Reading/calculating face flux field phi


Starting time loop

Time = 0.02

Courant Number mean: 0.009308026 max: 0.02843602



gradientInternalCoeffs cannot be called for a genericFvPatchField (actual type jumpCyclic)
on patch X of field U in file "OpenFOAM/mou-1.5/run/tutorials/test1/0/U"
You are probably trying to solve for a field with a generic boundary condition.

From function genericFvPatchField<type>::gradientInternalCoeffs( ) const
in file fields/fvPatchFields/basic/generic/genericFvPatchField.C at line 692.

FOAM exiting



I did not have any problem for "cyclic" BC, but with the "jumpCyclic" it give me this error, Would you help if you have any suggestion about that?

Thank you
mou

jens_klostermann October 17, 2008 18:38

Hi Hrv, I just wonder if th
 
Hi Hrv,

I just wonder if the jumpCyclic got checked in into svn OF-1.4.1-dev, because I didn't find it yet?! Or is the one you were talking at the beginning of the thread the fanBC in OF-1.5?

Best regards Jens

leejc April 16, 2010 15:35

Hi Dr. Jasak,

I was able to run dieselFoam with jumpcyclic but I could not figure out how to specify the value of the jump. Say, I like to have delta(U) = 1 along the normal of the surface, how do I specify this in the boundary condition file?

Thank you.

Jerry


All times are GMT -4. The time now is 19:29.