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

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

Add a vote from me :-) Than
 

Add a vote from me :-)

Thanks!
Alberto

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.

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

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

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

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

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

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

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