[samiam1000]

Dear All,

I am trying to simulate an opening window. I succeded in setting the mesh movement and I am now ready for my simulation.

The point is that before moving the mesh I have to fix the initial condition. What I wanna do is to impose a certain temperature in the internal volume and a different one in the external volume.

I thought about a T file that looks like:

.
.
.
dimensions      [0 0 0 1 0 0 0];

internalField	  uniform 298;
volume_internal   uniform 273;
volume_external	  uniform 298;

boundaryField
.
.
.

where volume_internal and volume_external are two different cellZones.

If I don't write

 internalField	  uniform 298;

, I get an error. With this line, on the contrary, I have both the zones with the same value of 298!

But this does not work properly.

Any suggestion?

Thanks,
Samuele

[gschaider]

Originally Posted by samiam1000

Dear All,

I am trying to simulate an opening window. I succeded in setting the mesh movement and I am now ready for my simulation.

The point is that before moving the mesh I have to fix the initial condition. What I wanna do is to impose a certain temperature in the internal volume and a different one in the external volume.

I thought about a T file that looks like:

.
.
.
dimensions      [0 0 0 1 0 0 0];

internalField	  uniform 298;
volume_internal   uniform 273;
volume_external	  uniform 298;

boundaryField
.
.
.

where volume_internal and volume_external are two different cellZones.

If I don't write

 internalField	  uniform 298;

, I get an error. With this line, on the contrary, I have both the zones with the same value of 298!

But this does not work properly.

Any suggestion?

Thanks,
Samuele

With "fix the initial condition" you mean "set the initial condition", right? (fixing for me is if the temperature in that zone is not allowed to change during the simulation)

One possibility is to use setFields (which you should know from the damBreak-tutorial). It can use other topoSetSources than boxToCell (I think the one you want is called zoneToCell but I'm not sure).The other possibility is funkySetFields which allows using expressions to set fields.

Both utilities allow you to set the field to an inhomogenous value. Then you start the simulation as usual

[samiam1000]

Actually yes, I meant set instead of fix..

But, since you said it, is it possible to FIX the temperature in order to remain constant during the simulation?

Anyway, I'll try what you suggested in order to set the initial condition..

Thanks a lot,

Samuele

[gschaider]

Originally Posted by samiam1000

Actually yes, I meant set instead of fix..

But, since you said it, is it possible to FIX the temperature in order to remain constant during the simulation?

Anyway, I'll try what you suggested in order to set the initial condition..

Thanks a lot,

Samuele

For fixing values: either forceEquation from swak4Foam (search the MessageBoard) or the runtime-selectable sources that are built into OF (check the release-notes). If you're lucky then the solver you use already has the runtime-selectable sources built in and you don't have to do any programming

[samiam1000]

Im using either bupyantPimpleDyMFoam or chtMultiRegionDyMFoam..