Dear Max,
currently we do not have more tutorials than the dumux course. But in
your case I think adapting an existing model/problem is sufficient for
your needs. If you are only interested in water and water vapor and no
additional component (no air in the system) then you might also have a
look at the 2p1c test case which deals with such a fluid system and
describes a problem where steam is injected in liquid water.
Apart from the values in your last mail you would need initial
conditions, e.g. is your domain initially fully saturated with water as
a liquid, or do you have a mixture of water and steam.
I hope this helps.
Best wishes,
Katharina
On 11/14/2018 09:10 PM, Maximilian Johannes Lueftner wrote:
Dear Katharina,
Thank you for your quick respons.
When I changed the settings to a calculation without gravity, I also
got no unphysical temperatures.
If I manage to set up an executable simulation with the 2p2c
nonisothermal model, that would be great. Is it correct, that in my
case, the N2 is not needed?
For the considered case, the values would be:
Geometry: x = 152.4mm, y = 58mm
Heat flux (from x = 50mm to x = 100mm) = 100 kW/m²
Inlet conditions:
Velocity = 0.25 mm/s
Temperature = 295,15 K
Porosity = 0.42
Permeability = 2,9e-10 m²
Further data can be found in table3 from the attachment in my last mail.
Or do I need any further values, than the ones above?
For me it is still very difficult to build a model from the beginning.
Is there any kind of tutorial on how to set up a new simulation or is
it easier to customize an already existing simulation?
I have already worked through the Dumux Course on my own, but i still
can not figure out how to do it proberly.
I would be very thankfull if you had a few more tips for me.
Thank you very much in advance.
Best regards,
Max
Zitat von Katharina Heck <[email protected]>:
Dear Max,
I am forwarding your mail to the mailing list, as it might be
interesting for others as well.
It should be possible to extend the combustion test to a 2d case
without any additions and set up the problem you described. Just
changing the grid to YASPGrid and a 2D grid did not lead to
nonphysical values, when I tried that. From what I know the
combustion test is very sensitive to different heat conductivities in
the solid. Unphysical values for that might lead to unphysical
temperatures easily. What parameters are you using? I could not find
values for that in the reference you send me. Are you interested in
calculating local thermal non-equilibrium (solving energy balance
equations for the solid and the fluid?) If not, you can also have a
look at a 2p2c nonisothermal model for your test case where one
balance equation is used for the fluid and solid phases.
Best wishes,
Katharina
On 11/11/2018 08:44 PM, Maximilian Johannes Lueftner wrote:
Dear Katharina,
thank you for the notification of the resolution of the problem, the
calculations now work without any problems.
Maybe you can give me some helpful tips on my next step?
I would like to rewrite the case to a 2D case. A porous material
should be flowed through from left to right and on the lower edge,
in the middle an energy source should bring the water to evaporate.
In the attachment I have uploaded a paper, which describes an
identical case. I would like to simulate this with Dumux. Is this
generally possible with the mpnc model or do I need more model
customizations?
I have already implemented a 2D geometry with YASPGrid, but on the
upper part at the end of the porous area (0,1m) I get very
unphysical temperatures again.
Since I am not sure if this kind of question is also relevant for
the public domain, I have now contacted you direcly. If you wish,
you can also hand off this email to the public area.
Thank you very much in advance.
Best regards,
Max
Zitat von Katharina Heck <[email protected]>:
Dear Max,
regarding your email last week, I think we now found the bug (there
were issues due to our introduction of a solidsystem and the
thermal conductivities were not implemented correctly) and fixed
thm on dumux - master as well. If you want to you can now checkout
the master branch again to use the combustion test.
Best wishes,
Katharina
On 10/26/2018 11:37 AM, Maximilian Johannes Lueftner wrote:
Dear Martin,
thanks for the quick help, the simulation is now running.
Unfortunately, I get very unphysical temperatures. Behind the
porous area, after 0.1m, the temperature rises up to over
50000K(depends on the grid).
I have already searched for the problem myself, but unfortunately
without success. The results also differ from those in the
Solution folder.
Could you please help me again?
Thank you in advance and best regards,
Max
Zitat von Martin Schneider <[email protected]>:
Dear Max,
I had a look at the test case and I got the same message.
The problem is that the grids folder is missing in your
build-cmake directory
where you run your tests.
This can be easily fixed by putting the following command into
your *CMakeLists.txt* file (in the directory
*porousmediumflow/mpnc/implicit/*):
*dune_symlink_to_source_files(FILES grids)*
After you have added this command you have to type *make* in your
build-cmake folder
such that a link to your grid files is added.
Thanks for reporting this issue. It will be fixed soon.
I hope this helps. Best regards,
Martin
On 10/19/2018 04:36 PM, Maximilian Johannes Lueftner wrote:
Dear DuMuX experts,
i try to calculate the simulation from the test folder
„porousmediumflow/mpnc/implicit/test_boxmpncthermalnonequil.cc"
and get the following error message:
DGF exception thrown (DGFException
[BasicBlock:/home/max/dumux3/dumux/dune-grid/dune/grid/io/file/dgfparser/blocks/basic.cc:28]:
file not found in BasicBlock::BasicBlock). Most likely, the DGF
file name is wrong or the DGF file is corrupted, e.g. missing
hash at end of file or wrong number (dimensions) of entries.
---> Abort!
Could you please help me to solve this problem? I tried it
myself several times but was not successful until now.
Thank you in advance and best regards,
Max
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--
_______________________________________________________________
Katharina Heck phone: +49 711 685 64719
IWS, Universität Stuttgart fax: +49 711 685 54719
Pfaffenwaldring 61 email:
[email protected]
D-70569 Stuttgart url: www.hydrosys.uni-stuttgart.de
_______________________________________________________________
--
_______________________________________________________________
Katharina Heck phone: +49 711 685 64719
IWS, Universität Stuttgart fax: +49 711 685 54719
Pfaffenwaldring 61 email:
[email protected]
D-70569 Stuttgart url: www.hydrosys.uni-stuttgart.de
_______________________________________________________________
--
_______________________________________________________________
Katharina Heck phone: +49 711 685 64719
IWS, Universität Stuttgart fax: +49 711 685 54719
Pfaffenwaldring 61 email: [email protected]
D-70569 Stuttgart url: www.hydrosys.uni-stuttgart.de
_______________________________________________________________
_______________________________________________
Dumux mailing list
[email protected]
https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
