Forum: OpenFOAM Running, Solving & CFD
June 12, 2022, 14:01
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
October 29, 2019, 12:33
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Replies: 82
Views: 50,382
Hi,
the code explanation is given...
Hi,
the code explanation is given here https://www.cfd-online.com/Forums/openfoam-programming-development/221739-fvm-laplacian-fvc-div.html#post748360
The equation manipulation should be...
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Forum: OpenFOAM Running, Solving & CFD
October 27, 2019, 18:15
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
October 27, 2019, 15:11
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
January 25, 2018, 08:17
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
January 25, 2018, 06:57
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
February 27, 2017, 11:10
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
February 27, 2017, 10:07
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Replies: 82
Views: 50,382
Dear Emeline,
At the moment I do not...
Dear Emeline,
At the moment I do not know what I should publish here, because the outcome of my investigations were that your derivation is correct and mine too ;)
Summing it up shortly; I...
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Forum: OpenFOAM Running, Solving & CFD
February 23, 2017, 16:47
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Replies: 82
Views: 50,382
You are Kind to say that I know everything. As...
You are Kind to say that I know everything. As you can see I try to help people, not to convince them by the stuff I did. Finally, I derived the equations myself and I also might did something wrong....
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Forum: OpenFOAM Running, Solving & CFD
February 23, 2017, 09:56
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
February 23, 2017, 06:51
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Replies: 82
Views: 50,382
Hi,
your last equations are not correct. It...
Hi,
your last equations are not correct. It should be two thirds. In general we could just remove the term (at least for incompressible) fluids but why should we? The continuity is not zero based...
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Forum: OpenFOAM Running, Solving & CFD
June 7, 2016, 03:11
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Replies: 82
Views: 50,382
Update about the term 2/3deltak
Dear all,
I was wrong with the assumption that the term \frac{2}{3}\delta_{ij}k is neglected. As Gerhard mentioned before, it is pushed into a modified pressure. For me it was obvious after I...
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Forum: OpenFOAM Running, Solving & CFD
January 22, 2016, 05:00
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Replies: 82
Views: 50,382
Dear all,
the latest news about the...
Dear all,
the latest news about the [math]2/3 k \delta_{ij}[/term]. As Gerhald told, this term could be included into the pressure to get some modified pressure field (Pope). But till now I think...
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Forum: OpenFOAM Running, Solving & CFD
January 12, 2016, 05:04
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Replies: 82
Views: 50,382
Dear Gerald,
thanks for the feedback. I...
Dear Gerald,
thanks for the feedback. I think I get the point. That means if I make a RANS calculation and I am really interested in the real reynolds-averaged pressure (due to the fact that we...
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Forum: OpenFOAM Running, Solving & CFD
January 12, 2016, 03:42
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
January 12, 2016, 03:13
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
December 17, 2015, 05:18
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Replies: 82
Views: 50,382
Niko I have a question to you:
...
Niko I have a question to you:
\left(\mu_v - \frac{2}{3}\mu\right)
The first term in your equation is the volumetric viscosity also known as bulk viscosity that is neglected in most/all...
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Forum: OpenFOAM Running, Solving & CFD
December 9, 2015, 01:22
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
December 7, 2015, 06:07
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Replies: 82
Views: 50,382
Dear Nico,
you are right. I made a mistake...
Dear Nico,
you are right. I made a mistake with the viscosities ;).
Here are my derivation that I did now... I have to check it again these days but it seems that everything is correct.
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Forum: OpenFOAM Running, Solving & CFD
December 7, 2015, 03:33
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Replies: 82
Views: 50,382
Hi Niko,
thanks for the replay but I know...
Hi Niko,
thanks for the replay but I know how the equations look like (:
You are right that the number "2" is shortened with the 1/2 from the strain-rate tensor. For the 2 in my derivation I have...
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Forum: OpenFOAM Running, Solving & CFD
December 4, 2015, 11:22
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Replies: 82
Views: 50,382
Hi,
Of course you are right. In terms of...
Hi,
Of course you are right. In terms of buoyancy turbulence you should use the effective viscosity.
How you get 4 x S?
In my previous derivatives it would be better to use the effective...
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Forum: OpenFOAM Running, Solving & CFD
December 4, 2015, 09:25
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Replies: 82
Views: 50,382
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Forum: OpenFOAM Running, Solving & CFD
December 4, 2015, 09:13
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Replies: 82
Views: 50,382
Hi,
okay as far as I read your equations...
Hi,
okay as far as I read your equations your are right but it is interesting that everybody denotes everything with other symbols. In all literature that I read, the Cauchy stress tensor is...
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Forum: OpenFOAM Running, Solving & CFD
December 4, 2015, 06:06
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Replies: 82
Views: 50,382
The reason is the following:
- I don't know...
The reason is the following:
- I don't know it exactly without having a look into the code but it is easy to understand
- You have an estimation of the velocity field and hence you know the...
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Forum: OpenFOAM Running, Solving & CFD
December 2, 2015, 09:03
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Replies: 82
Views: 50,382
Again,
you are right. The deviatoric part is...
Again,
you are right. The deviatoric part is tracefree but I also added the trace because it is a term of numerical stabilisation. This will happen due to the fact of my derivation. Also you are...
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