Forum: OpenFOAM Running, Solving & CFD
July 3, 2021, 06:40
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
June 16, 2021, 13:00
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Replies: 100
Views: 20,471
Ahhh now I got it. You use the functionObject...
Ahhh now I got it. You use the functionObject function to generate the field ph_rgh during the simulation and it is in the registry. Hence, the boundary condition does have access to the field ! :) ...
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Forum: OpenFOAM Running, Solving & CFD
June 16, 2021, 06:08
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Replies: 100
Views: 20,471
Hey,
I never went through the ph_rgh...
Hey,
I never went through the ph_rgh field and boundary condition in detail. However, in OpenFOAM v2012 (ESI version) this field is only used in the fireFoam solver. Easy to check by doing the...
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Forum: OpenFOAM Running, Solving & CFD
June 16, 2021, 03:22
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Replies: 100
Views: 20,471
This field is only used in the fireFoam solver....
This field is only used in the fireFoam solver. As the buoyant*Solvers don't have these field, the condition does not give us any benefit. You should all try to use the transient solver first for a...
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Forum: OpenFOAM Running, Solving & CFD
March 24, 2021, 09:57
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Replies: 100
Views: 20,471
The ph_rgh boundary condition however, can only...
The ph_rgh boundary condition however, can only be used with fireFoam as this field is not present for, e.g., buoyant*Foam. Hence, my question is still what we should do for vertical outlets? As I...
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Forum: OpenFOAM Running, Solving & CFD
September 10, 2019, 04:51
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Replies: 100
Views: 20,471
Hi all,
I just made a test case and based on...
Hi all,
I just made a test case and based on that, the hydrostatic part is based on equation (2). Otherwise we should have the same static pressure in both cases, right.
In my case, I just...
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Forum: OpenFOAM Running, Solving & CFD
September 10, 2019, 03:20
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Replies: 100
Views: 20,471
Hi Joes,
got it. Hmm... well the p field...
Hi Joes,
got it. Hmm... well the p field should have these behavior, shouldn´t it? Interesting point and question that I did not investigate till now. I agree to both of you. For uniform density...
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Forum: OpenFOAM Running, Solving & CFD
September 9, 2019, 12:28
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Replies: 100
Views: 20,471
Hi Jost,
I agree, FOAM calculates the...
Hi Jost,
I agree, FOAM calculates the field p_rgh using:
p=p_rgh+rho*gh
but the density field is a volume scalar field and thus the quantity can be different in each numerical cell...
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Forum: OpenFOAM Running, Solving & CFD
September 9, 2019, 07:58
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Replies: 100
Views: 20,471
Hi all,
as I am investigating the first time...
Hi all,
as I am investigating the first time deeply into the pressure calculation in OpenFOAM, I found some mistakes I always had in my mind (and therefore, I always made some mistakes in the...
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Forum: OpenFOAM Running, Solving & CFD
June 22, 2018, 11:20
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
February 7, 2017, 10:29
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Replies: 100
Views: 20,471
Your p_rgh solver has problems:
DICPCG: ...
Your p_rgh solver has problems:
DICPCG: Solving for p_rgh, Initial residual = 0.95771, Final residual = 12.2972, No Iterations 1001
You should use GAMG solver for pressure (speed up)
...
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Forum: OpenFOAM Running, Solving & CFD
February 7, 2017, 10:01
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Replies: 100
Views: 20,471
Dear Antionio,
please start with dt = 1e-7....
Dear Antionio,
please start with dt = 1e-7. You first time step is too big and therefore the courant number explodes already: Courant Number mean: 9.24507 max: 26.4701. That would be my first...
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Forum: OpenFOAM Running, Solving & CFD
January 17, 2014, 07:18
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
January 15, 2014, 16:07
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Replies: 100
Views: 20,471
Hi Bernhard,
I tryed several options.
-...
Hi Bernhard,
I tryed several options.
- changing 0/ files
- changing initialization
- changing thermodynamicProperties (with air its working)
- test case with cht
- test case with buoyant
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Forum: OpenFOAM Running, Solving & CFD
January 14, 2014, 12:51
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
January 13, 2014, 15:07
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
January 13, 2014, 01:24
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Replies: 100
Views: 20,471
Dear Bernhard,
I think in your case it is...
Dear Bernhard,
I think in your case it is possible to start with your steady-state solution, arent you?
Can you give me a hint why you have to use buoyantPimpleFoam befor using cht?
How...
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Forum: OpenFOAM Running, Solving & CFD
November 8, 2013, 08:17
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Replies: 100
Views: 20,471
Hi,
that was a mistake I made. I corrected...
Hi,
that was a mistake I made. I corrected it in the last post.
That "no" "false" "off" should be the same is correct. I made any other strange mistake that I can not say at the moment. Maybe I...
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Forum: OpenFOAM Running, Solving & CFD
November 8, 2013, 07:38
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
November 7, 2013, 13:21
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Replies: 100
Views: 20,471
Hi Joachim,
thanks for having a look at...
Hi Joachim,
thanks for having a look at the case.
Its working ? On my computer its not working :(
I changed the fvSolution to yours and added the additionally line in the thermodynamics to...
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Forum: OpenFOAM Running, Solving & CFD
November 7, 2013, 11:50
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Replies: 100
Views: 20,471
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Forum: OpenFOAM Running, Solving & CFD
November 7, 2013, 11:35
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Replies: 100
Views: 20,471
Hi all,
there is something strange in my...
Hi all,
there is something strange in my simulation.
After changing the fvSolution with underrelaxation and using nOuterCorrections you can see that p_rgh is divergating:
Starting time loop...
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Forum: OpenFOAM Running, Solving & CFD
November 7, 2013, 11:23
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Replies: 100
Views: 20,471
Hi Joachim,
I know that the PIMPLE solver is...
Hi Joachim,
I know that the PIMPLE solver is a combination of PISO + SIMPLE. But your hint makes sence.
To your suggestion to have a look at the tutorials.
In the incompressible solver there...
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Forum: OpenFOAM Running, Solving & CFD
November 7, 2013, 06:04
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Replies: 100
Views: 20,471
Hi Hannes,
I increased the "writePrecision"...
Hi Hannes,
I increased the "writePrecision" and not the "timePrecision" :)
At the moment I increased both to 15, set my dT lower and the nonOrthogonal to 1.
My mesh is good:
Time = 0
...
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Forum: OpenFOAM Running, Solving & CFD
November 6, 2013, 17:34
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Replies: 100
Views: 20,471
Hi,
PIMPLE and underrelaxation?
Is...
Hi,
PIMPLE and underrelaxation?
Is underrelaxation not changing the real solution (accuracy in time)?
Well I used nOuterCorrectors > 1 but without success anyway. The error is different. I...
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