internal field
 

Hi!

I have a cylinder and I want to simulate the concentration.
my problem is: I have the cylinder split in 20 parts and I want to say that 10 volums are C=0.5 and the others 10 volums C=-0.5.

how can I put this in the /0?? becouse in internalField can only be one value ... and I want to specify the volums, not the surfaces

Thanks!

You can use setFields for that purpose. Check the damBreak tutorial for an example.

Regards

ok!!! thanks :)

i have another question, in the example of break damm

defaultFieldValues
(
volScalarFieldValue alpha1 0
);

regions
(
boxToCell
{
box (0 0 -1) (0.1461 0.292 1);
fieldValues
(
volScalarFieldValue alpha1 1
);
}
);

what is box (0 0 -1) (0.1461 0.292 1);?? I know that the second parentesis is the coordinates x,y,z , but (0 0 -1) i don't know what it is.

and in my case that i have a cylinder, how can I describe the coordinates if it's cylindrical??

thanks

Hello,

For cylinderical region you need to use cylinderToCell.

All the cells whose center is within a box with lower corner (minX minY minZ) = (0 0 -1) and upper corner (maxX maxY maxZ) = (0.1461 0.292 1) get the alpha1 = 1.

Depending on the geometry of the 20 parts you may need to use cylinderToCell as Yogesh says, or you can continue using boxToCell.

ok thanks! but in the cylinder the lower corner and de upper corner which numbers I have to put??

the cylinder is split in 20 similar parts, like 20 small cylinders

cylinderToCell has a different input, 2 points and a radius instead of a box:

p1 (0 -0.08 0);
p2 (0 0.06 0);
radius 0.12;

defaultFieldValues
(
volScalarFieldValue p 0
);

regions
(
cylinderToCell
{
cylinder (0 0 0) (0 0 2.5) 1.25;
fieldValues
(
volScalarFieldValue p 1
);
}
);


with this setFields give me an error, FOAM FATAL IO ERROR: keyword p1 is undefined in dictionary cylinderToCell

what does it mean?

It asks for word p1, as you have not specified the points:

defaultFieldValues
(
volScalarFieldValue p 0
);

regions
(
cylinderToCell
{
p1 (0 0 0);
p2 (0 0 2.5);
radius 1.25;
fieldValues
(
volScalarFieldValue p 1
);
}
);

thanks!!!!! :)

Hi
i have this error with the tool cylinderToCell

--> FOAM FATAL IO ERROR:
keyword fieldValues is undefined in dictionary "::cylinderToCell"

Can you help me?

check out the spelling of of fieldvalues then

HI
I get this message after pasting your code to setfeildsdict

Setting field default values
--> FOAM Warning :
From function void setCellFieldType(const fvMesh& mesh, const labelList& selectedCells,Istream& fieldValueStream)
in file setFields.C at line 124
Field p not found

Setting field region values
Adding cells with centre within cylinder, with p1 = (0 0 -0.003), p2 = (0 0 0.003) and radius = 0.003
--> FOAM Warning :
From function void setCellFieldType(const fvMesh& mesh, const labelList& selectedCells,Istream& fieldValueStream)
in file setFields.C at line 124
Field p not found (I'm guessing this has to do with p file.. but I have p_rgh??? :O)

End

Can you help please?

Hi Xoitx,

I have the same problem!, Did you find a solution?

Regards,

--Carlos

Hi Carlos
I solved it using this
you can find all of the commands and usage here:
openfoam30/applications/utilities/mesh/manipulation/topoSet/
There is a file called topoSetDict
Check it out :D

Regards
Xoitx

Thanks!
--Carlos

Hi, I also same error! :
" keyword p1 is undefined in dictionary cylinderToCell "

I introduced keyword p1 !!!
defaultFieldValues
(
volScalarFieldValue alpha.water 1
);

regions
(
cylinderToCell
{
cylinder
p1 (-0.83261 0.11118 0);
p2 (0.82468 -0.11012 0);
radius 0.03;
fieldValues
(
volScalarFieldValue alpha.water 0
);
}
);

Please help me.
Ali

Hi, I also have same error! :
" keyword p1 is undefined in dictionary cylinderToCell "

I introduced keyword p1 :

defaultFieldValues
(
volScalarFieldValue alpha.water 1
);

regions
(
cylinderToCell
{
cylinder
p1 (-0.83261 0.11118 0);
p2 (0.82468 -0.11012 0);
radius 0.03;
fieldValues
(
volScalarFieldValue alpha.water 0
);
}
);

Please help me.
Ali