direct assignment of source terms to nodes

[cb]

Dear all,

is there a source term method implemented in OGS to assign a specific
flux of a flow pcs to a list of nodes?

As far as I understand, $DIS_TYPE DIRECT will assign a CONSTANT volume
flux (i.e. m³/s) to all nodes listed in a text file, but I want to
assing the flux in m³/s per m² of patch area for each node, i.e. a
combination o DIRECT and CONSTANT_NEUMANN.

Cheers, Christof

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_______________________________________
Dr. Christof Beyer
Institute of Geosciences
Geohydromodelling
Christian-Albrechts-University Kiel
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[Marc Walther]

Hey Christoph,

I don't know, if I clearly understood you, but you can use the keyword
"$DISTRIBUTE_VOLUME_FLUX" to give a volume per time on a line or
surface, which will then distribute this flux over the element. If you
have your list of nodes as individual source terms, this might work.

Cheers,
Marc

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Marc Walther
Hydrologist
JProf. Dr. rer. nat.

Helmholtz Centre for Environmental Research - UFZ
Department of Environmental Informatics
Permoserstraße 15, 04318 Leipzig, Germany

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[Wenqing Wang]

Dear Christof,

There is no direct method for this kind of BC input. Maybe you can mesh
the area first, then write a short script (or c++ code) to convert the
2D elements of mesh into surfaces of gli and to assign the Neumann BC to
these surfaces.

Wenqing

[Thomas Fischer]

On 2016-12-09 10:16, Wenqing Wang wrote:
> There is no direct method for this kind of BC input. Maybe you can mesh
> the area first, then write a short script (or c++ code) to convert the
> 2D elements of mesh into surfaces of gli and to assign the Neumann BC to
> these surfaces.

I think the workflow [0] could be a good starting point. Maybe the last
step of the workflow needs some modification/additional work.
For the converting of the surface mesh to an geometry it is possible to
use the DataExplorer.

Best regards,
Tom

[0]
https://docs.opengeosys.org/docs/tools/model-preparation/computesurfacenodeidsinpolygonalregion


--

Dr. Thomas Fischer

Department of Environmental Informatics

Helmholtz Centre for Environmental Research - UFZ

Permoserstraße 15, 04318 Leipzig, Germany

Phone +49 341 235 10 54
Fax +49 341 235 19 39

Email thomas....@ufz.de
Web http://www.ufz.de

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
Registered Office: Leipzig
Registration Office: Amtsgericht Leipzig
Trade Register Nr. B 4703
Chairman of the Supervisory Board: MinDirig Wilfried Kraus

Scientific Director: Prof. Dr. Georg Teutsch
Administrative Director: Dr. Heike Graßmann

[cb]

Hi Thomas, Wenqing and Marc,

thanks for your suggestions. This looks like a pretty nice way to assign
BCs or STs.

One more question: I guess the ExtractSurface tool will extract outer
surfaces of a mesh. In case a ST has to be assigned to a surface
*within* the 3D mesh (e.g. a fracture or similar) it would then be
necessary to cut away the surrounding elements before surface
extraction. In Gina, this can be achieved using the "delete by matgroup"
tool. I just found the "Remove Mesh Elements" method description, this
obviously does the job...

Best regards, Christof

Am 12.12.2016 um 06:46 schrieb Thomas Fischer:
> On 2016-12-09 10:16, Wenqing Wang wrote:
>> There is no direct method for this kind of BC input. Maybe you can mesh
>> the area first, then write a short script (or c++ code) to convert the
>> 2D elements of mesh into surfaces of gli and to assign the Neumann BC to
>> these surfaces.
>
> I think the workflow [0] could be a good starting point. Maybe the
> last step of the workflow needs some modification/additional work.
> For the converting of the surface mesh to an geometry it is possible
> to use the DataExplorer.
>
> Best regards,
> Tom
>
> [0]
> https://docs.opengeosys.org/docs/tools/model-preparation/computesurfacenodeidsinpolygonalregion
>
>

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