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Forum: OpenFOAM Running, Solving & CFD

November 8, 2008, 00:39

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

It seems that the discretizati

It seems that the discretization needs tuning, if you keep on getting the bounding error for k and epsilon the solution may blow up.

Just try tightening your tolerances.

Regards,

Forum: OpenFOAM Running, Solving & CFD

November 7, 2008, 10:13

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

Hello Eric, Quoting from y

Hello Eric,

Quoting from your post:

"It appears me logical tu use a fixed temperature at the inlet and the plate, a zeroGradient condition at the boundary Up (infront of the plate)."
...

Forum: OpenFOAM Running, Solving & CFD

November 7, 2008, 07:33

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

Hello Eric, Its really dif

Hello Eric,

Its really difficult to say what might be the exact trouble!

If you are using turbulence do you observe bounding errors? Just switch off turbulence and see if the error...

Forum: OpenFOAM Running, Solving & CFD

November 7, 2008, 04:12

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

If your boundary conditions ar

If your boundary conditions are not right, this leads to wrong calculation of the pEqn which eventually results in irrational p values, and irrational velocities.. so your maximum courant number...

Forum: OpenFOAM Running, Solving & CFD

November 7, 2008, 03:58

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

Hello Pattyn, I have reali

Hello Pattyn,

I have realized that the code for buoyantFoam and buoyantSimpleFoam has changed considerably from version 1.4.1 to 1.5. Even though, I am not very clear about the declaration of...

Forum: OpenFOAM Running, Solving & CFD

November 6, 2008, 06:49

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

Use "fixedFluxBuoyantPressure"

Use "fixedFluxBuoyantPressure" for the flat plate boundary at "p". I think the problem is in getting the boundary conditions right. Can you paste your "p" boundary condition here?

Forum: OpenFOAM Running, Solving & CFD

October 15, 2007, 09:28

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

Please check your thermoPhysic

Please check your thermoPhysicalProperties file.

Try this for Air instead of previous form... Hope this helps.

mixture air 1 28.9 1000 2.544e+06 1.8e-05 0.7;

Forum: OpenFOAM Running, Solving & CFD

October 6, 2007, 01:18

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

are you trying to add aother s

are you trying to add aother specie in the previous case? What complexities are you talking about?

Forum: OpenFOAM Running, Solving & CFD

October 4, 2007, 08:25

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

Check the R file in the 0 dire

Check the R file in the 0 directory, just like in the buoyantFoam tutorial set the internalField likewise

dimensions [0 2 -2 0 0 0 0];
internalField uniform (0 0 0 0 0 0 0 0 0)

followed...

Forum: OpenFOAM Running, Solving & CFD

October 4, 2007, 05:31

Replies: 25

BuoyantFoam problem

Views: 3,303

Posted By prashant24983

I believe there is something w

I believe there is something wrong with the internal field that you have initialised in k epsilon file... Make sure that they are not initialised to zero

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