Hi there, For a face on a p
 

Hi there,

For a face on a patch, I need variable values on the neighbouring faces (I want to compute a gradient on the surface).
I have spent quite some time now on it, but the only way I could figure out was to get the corresponding internal cell, cycle through its faces, get the neighbour cells for these faces, check their faces if they are external - in short, horribly messy and prone to errors.
Is there perhaps any hidden functionality which could give me that in an easier way?

Thank you!

Thomas

It sounds like you really wish
 

It sounds like you really wish to be iterating over the boundary patches.

The quick-start would be to look at
applications/utilities/postProcessing/wall
and see if they do something similar to what you need.

Thank you - but there is some
 

Thank you - but there is some misunderstanding:

@Marc: its not just iterating - for each face (I can iterate through faces) I would like to know the faces sharing edges with this face on the surface - which reminds me right now that somewhere I have seen a function called edgesFaces .... have to search again ...

@Bernhard:
snGrad gives me the gradient normal to surface, I need the tangential one ...

I have also tried to figure out the finiteArea stuff - there is some code to compute gradients on areaMeshes - here I am stuck with that I do not know (Yet?) how to construct a faMesh. Found a constructor taking a polyMesh - but is that only my surface mesh? If so, how to make a polyMesh from my boundaryMesh?
Questions, questions, questions ....

I think you can really get lost in OpenFOAM - a lifetime occupation http://www.cfd-online.com/OpenFOAM_D...part/happy.gif

Tangential gradient can be cal
 

Tangential gradient can be calculated using finite are calculus. See the attached application and case.






Regards,
Zeljko Tukovic

Zeljko, sounds great! But t
 

Zeljko, sounds great!

But the links dont work, there is just an image http://www.cfd-online.com/OpenFOAM_D...part/happy.gif

sorry, just saw your mail.
 

sorry, just saw your mail.

Works out of the box, sweet!

Thank you a lot!

Thomas

Hello! May I also have the
 

Hello!

May I also have the same example? The link in post above seems to be broken. Thank you a lot!

/Normunds

Hi Normunds, I suppose its
 

Hi Normunds,

I suppose its o.k. if I post it here again, since Zeljko tried to do that already.
So here is what he tried to post and then sent me by mail:

http://servww6.ww.uni-erlangen.de/~j...rfGradCase.tgz

http://servww6.ww.uni-erlangen.de/~j...adientFoam.tgz

I got it. Thank you very much
 

I got it. Thank you very much both, Zeljko and Thomas, with it I will save a lot of my time!

Have a nice day!

/normunds

Zeljko, I just found out I
 

Zeljko,

I just found out I apparently need the utility makeFaMesh to generate the surface mesh, however, I cant find it.
Do you have a hint perhaps?

Thanks again!

Thomas

OpenFOAM-1.3/applications/util
 

OpenFOAM-1.3/applications/utilities/mesh/generation/makeFaMesh

Regards
Zeljko

no http://www.cfd-online.com/O
 

no http://www.cfd-online.com/OpenFOAM_D...part/happy.gif
its in tutorials/finiteAreaFoam/surfactantsTransport/makeFaMesh

(at least in my OpenFOAM-1.3..)
but thanks!

to whom it may concern: the
 

to whom it may concern:

the above mentioned makeFaMesh fails

I then downloaded from http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/release/ OpenFOAM-1.3.General_01_05_07.tgz, made a backup copy of my original finiteArea subdirectory, copied the one from the downloaded distribution there, built libfiniteArea.so again, built makeFaMesh again, and voila - got the finite area mesh.

Zeljko, Is there perhaps an
 

Zeljko,

Is there perhaps an elegant way to transfer data from areaField (on surface mesh from a patch) to corresponding patchField (on patch from volume mesh) ?
Currently I am trying to iterate over them and to assign values, but have the strong feeling this is not OpenFOAM-Style http://www.cfd-online.com/OpenFOAM_D...part/happy.gif

May I see how you performe the
 

May I see how you performe the transfer?

Zeljko

You can do all that using the
 

You can do all that using the following line:

TSurf.internalField() = T.boundaryField()[pathcID];

where

patchID = mesh.boundaryMesh().findPatchID("top");


If your area mesh consists of only one patch, face ordering in the area mesh is the same as in the patch.

Zeljko

Hi Zeljko, Do you plan on p
 

Hi Zeljko,

Do you plan on porting the finite Area code to 1.4?
Are parallel edge communications working yet?

Eugene

alas ..... that changes everyt
 

alas ..... that changes everything ....
does it mean that code wont work in parallel?

Yes, parallel edge communicati
 

Yes, parallel edge communications don't work yet. I plane to do that till the end of this year.

finiteArea compiling error
 

hi everybody,
I would like to try the finiteArea method for a film simulation, I'm working with the 1.5 release and I downloaded the 1.5-dev in order to get the finite area stuff. But when I compile the lduSolver that I think it's needed for finiteArea I get this error:

In file included from lduPrecon/CholeskyPrecon/CholeskyPrecon.C:36:
lduPrecon/CholeskyPrecon/CholeskyPrecon.H:56: error: expected class-name before ‘{’ token

and this is the code line:

class CholeskyPrecon
:
public lduPreconditioner
{
// Private Data

Have you any hint?
I've tried also with folders of version 1.4-dev and 1.4.1-dev, with same results.

Thanks you in advance

lduSolver compiling error
 

Hi Andrea,

I am facing exactly the same problem as you are. Have you been able to sort it out yet - seems no one has replied to your post.

Please kindly advise me what to do if you have fixed the problem. I get exactly the same error message as you reported when I try to compile lduSolver:

error: expected class-name before "{" token


Otherwise I will be glad if anyone knows the solution to this problem and is able to help.

Thanks for your anticipated reply.

Sunny

Hi!

I'm also intrested in calculating the tangential surface gradient as in the example is said to do, however the links do no longer work. If anyone would like to share it with me once again it could help me a lot.

Thank you in advance.


/ Johan