[student666]

Yes, I did it with faceset. But I want to try the same with cellset also

If you want to define a patch with a BOUNDARY condition, you have to define it on the faces of the BOUNDARIES of your domain (and the condition is applied to the face center).

I think it's correct to say that:
you can't define a BOUNDARY CONDITION on a cell center (in case of openFOAM); because if you're setting a condition on a cell center (in case of openFOAM) you're setting an INITIAL CONDITION, that furthermore it can be constant during your simulation, or dependent by the BOUNDARY CONDITIONS of the BOUNDARIES of your domain...that's the reason createPatch utility complains about and ask for a faceSet or subset of faces...

So you can't obtain it directly, but:
if you have to set a boundary condition on the BOUNDARY of your domain, that has a different shape, you should extract you circular patch with other tools (e.g. setSet) or prepare your starting mesh differently...

hint: take for example the tJunctionFan tutorial

Regards

[me12p1006]

Thanks student666

I already created 3D rectangular geometry with block mesh (20cm*20cm*50cm). Now I just want to pump air in to this 3D geometry (initially filled with water) through a circular inlet on the bottom face (radius = 2 cm). I used faceset with cylindertocell source. p1 and p2 points lies on the same face (center of the bottom wall: x=10 cm, y=10 cm, z=0 cm).

The code is running with out any errors this time. But I was unable to see the circular inlet and air flow through it. I am attaching my files below. Please Help me with it.

[student666]

Create polyMesh for time = 0

Reading createPatchDict

Adding new patch inlets as patch 3 from
{
    type            patch;
}


Read 0 faces from faceSet faceGrabbed

Doing topology modification to order faces.

Not synchronising points.

Removing patches with no faces in them.

No patches removed.
Writing repatched mesh to 0

End

this is the output of the createPatch utility, it has not selected any faces, maybe your coordinates are wrong.

Hint:

check one more time....

NOTE:
In any case, OpenFoam differently from other codes, gives full explanations about errors, please read carefully the outputs!

[me12p1006]

Thanks student666

I have double checked the coordinates. In TopoSet dictionary as given below:

actions
(
//Grabbing Faces
{
name faceGrabbed;
type faceSet;
action new;
source cylinderToCell;
sourceInfo
{
p1 (0.1 0.1 0);
p2 (0.1 0.1 0);
radius 0.02;
}

}

);

I tried to make a circle on the bottom face of the 3D rectangular enclosure (0.2metre*0.2metre*0.5metre). My enclosure coordinates are (x=0.2 y=0.2 z=0.5). Now in the above toposet dictionary: I selected p1 as (0.1 0.1 0), this keeps the circle center exactly on the bottom face. However, since I need a circular inlet and the source is a cylinder, my p2 will coincide with p1 and hence the cylinder confines to circle.

If possible, you try to make a circle of your choice in the files i sent you. Let me know if any thing works or if any way is possible to solve this.

Thanks in advance.

[sihaqqi]

I have remved my question from here soplease disregard. I have asked complete query in a new thread named topoSetDict

[love_huang]

Originally Posted by sihaqqi

I have remved my question from here soplease disregard. I have asked complete query in a new thread named topoSetDict

Dear sihaqqi,

I am learning to use the topset for defining the regions of overset grids. The following is an example of openfoam tutorial.

I don't know how to define the value of insidePoints, and what is the mean of invert. Can you help me?

actions
(
{
name c0;
type cellSet;
action new;
source regionToCell;
sourceInfo
{
insidePoints ((0 1.5 0));
}
}

{
name c1;
type cellSet;
action new;
source cellToCell;
sourceInfo
{
set c0;
}
}

{
name c1;
type cellSet;
action invert;
}
);


------
Shanqin

[Reda123]

Originally Posted by AliRezaJafari

Hi
How can be defined for a triangular box?

Hello Ali,
Did you find the solution for this geometry. I also have same problem?

[jzy]

Originally Posted by Mahdi2010

Hi all

I am building a test case with 2 main regions (1 solid and 1 fluid attached together). I built it simply by using topoSet. My question is if I wanna create a wallFilmRegion between these two regions, how can I address the source info for that? I mean what it the correct source info for this patch?

If you look at the case "tutorail/lagrangian/reactingParcelFilmFoam/rivuletpanel", the wallFilmRegion is created using a source from blockMeshDict.
{
name wallFilm;
type faceSet;
action new;
source patchToFace;
sourceInfo
{
name filmWalls;
}
}
{
name wallFilm;
type faceZoneSet;
action new;
source setToFaceZone;
sourceInfo
{
faceSet wallFilmFaces;
}
}

But in my case the connecting patch between solid region and fluid region is not defined in advance and should be created within the topoSet itself! (First by topoSet I define 2 regions and now I wanna address the patch in between as source for wallFilmRegion.) any idea for that!?

Hi, I also want to extract the patch between two cellsets with topoSet, did you solve this problems?