Boundary conditions

Dear Users,

I was wondering how to define free boundary conditions for LIQUID_FLOW. I don’t want impose any pressure or flux at the outlet of my model (reservoir). I was looking for smething like Neumann conditions but OGS does not support this. Can anybody give me a clue? I will be glad really!

Jhonny,

Since OGS is based on FEM, free boundary conditions cannot be handled. There are some numerical hacks to imitate it, but have not been implemented in OGS so far. If you make a domain larger and keep enough distance from the domain boundary, influence of boundary conditions can be neglected.

BTW Neumann conditions are supported in ST files.

best,
nori

···

On 07/19/2016 08:45 AM, Jhonny Encalada wrote:

Dear Users,

  I was wondering how to define free boundary conditions for
LIQUID_FLOW. I don't want impose any pressure or flux at the outlet of
my model (reservoir). I was looking for smething like Neumann conditions
but OGS does not support this. Can anybody give me a clue? I will be
glad really!

Jhonny,

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Norihiro Watanabe, Dr.-Ing.
Department of Environmental Informatics (ENVINF)
Wissenschaftler

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
Helmholtz Centre for Environmental Research GmbH - UFZ
Permoserstraße 15 / 04318 Leipzig / Germany

norihiro.watanabe@ufz.de / http://www.ufz.de
Telefon +49 341 235 1806

Sitz der Gesellschaft: Leipzig
Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703
Vorsitzender des Aufsichtsrats: MinDirig Wilfried Kraus
Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
Administrativer Geschäftsführer: Dr. Heike Graßmann

Dear Norihiro, thanks for the reply.

I think I didn’t explain well my problem. I was talking about the extraction points(wells) in a geothermal reservoir when the pressure and flow rate at the extraction well(s) are unknown. I read the publication by Blocher et al. (2015); it is stated that flow rates and pressures were calculated in OGS. Based on this fact, I was wondering how to define this open boundary conditions so I can calculate production flow rates and pressures given injection rates and injection pressures.

Thanks again!

···

On Tuesday, 19 July 2016 11:33:21 UTC+1, Norihiro Watanabe wrote:

Since OGS is based on FEM, free boundary conditions cannot be handled. There are some numerical hacks to imitate it, but have not been implemented in OGS so far. If you make a domain larger and keep enough distance from the domain boundary, influence of boundary conditions can be neglected.

BTW Neumann conditions are supported in ST files.

best,
nori

On 07/19/2016 08:45 AM, Jhonny Encalada wrote:

Dear Users,

I was wondering how to define free boundary conditions for
LIQUID_FLOW. I don’t want impose any pressure or flux at the outlet of
my model (reservoir). I was looking for smething like Neumann conditions
but OGS does not support this. Can anybody give me a clue? I will be
glad really!

Jhonny,


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Norihiro Watanabe, Dr.-Ing.
Department of Environmental Informatics (ENVINF)
Wissenschaftler

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
Helmholtz Centre for Environmental Research GmbH - UFZ
Permoserstraße 15 / 04318 Leipzig / Germany

norihiro...@ufz.de / http://www.ufz.de

Telefon +49 341 235 1806

Sitz der Gesellschaft: Leipzig
Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703
Vorsitzender des Aufsichtsrats: MinDirig Wilfried Kraus
Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
Administrativer Geschäftsführer: Dr. Heike Graßmann

ah i got your point. In that paper, we added wellbore elements (1D lines) and set a fixed flow rate at the top of the wellbore elements.

n

···

On 07/19/2016 01:03 PM, Jhonny Encalada wrote:

Dear Norihiro, thanks for the reply.

I think I didn't explain well my problem. I was talking about the
extraction points(wells) in a geothermal reservoir when the pressure
and flow rate at the extraction well(s) are unknown. I read the
publication by Blocher et al. (2015); it is stated that flow rates and
pressures were calculated in OGS. Based on this fact, I was wondering
how to define this open boundary conditions so I can calculate
  production flow rates and pressures given injection rates and
injection pressures.

Thanks again!

On Tuesday, 19 July 2016 11:33:21 UTC+1, Norihiro Watanabe wrote:

    Since OGS is based on FEM, free boundary conditions cannot be
    handled. There are some numerical hacks to imitate it, but have not
    been implemented in OGS so far. If you make a domain larger and keep
    enough distance from the domain boundary, influence of boundary
    conditions can be neglected.

    BTW Neumann conditions are supported in ST files.

    best,
    nori

    On 07/19/2016 08:45 AM, Jhonny Encalada wrote:
     > Dear Users,
     >
     > I was wondering how to define free boundary conditions for
     > LIQUID_FLOW. I don't want impose any pressure or flux at the
    outlet of
     > my model (reservoir). I was looking for smething like Neumann
    conditions
     > but OGS does not support this. Can anybody give me a clue? I will be
     > glad really!
     >
     > Jhonny,
     >
     > --
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    --
    Norihiro Watanabe, Dr.-Ing.
    Department of Environmental Informatics (ENVINF)
    Wissenschaftler

    Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
    Helmholtz Centre for Environmental Research GmbH - UFZ
    Permoserstraße 15 / 04318 Leipzig / Germany

    norihiro...@ufz.de <javascript:> / http://www.ufz.de
    Telefon +49 341 235 1806

    Sitz der Gesellschaft: Leipzig
    Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703
    Vorsitzender des Aufsichtsrats: MinDirig Wilfried Kraus
    Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
    Administrativer Geschäftsführer: Dr. Heike Graßmann

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--
Norihiro Watanabe, Dr.-Ing.
Department of Environmental Informatics (ENVINF)
Wissenschaftler

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
Helmholtz Centre for Environmental Research GmbH - UFZ
Permoserstraße 15 / 04318 Leipzig / Germany

norihiro.watanabe@ufz.de / http://www.ufz.de
Telefon +49 341 235 1806

Sitz der Gesellschaft: Leipzig
Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703
Vorsitzender des Aufsichtsrats: MinDirig Wilfried Kraus
Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
Administrativer Geschäftsführer: Dr. Heike Graßmann

Dear Norihiro,

I understand your explanation. I will try as you said.

Thanks!

Jhonny

···

On Tuesday, 19 July 2016 12:08:49 UTC+1, Norihiro Watanabe wrote:

ah i got your point. In that paper, we added wellbore elements (1D lines) and set a fixed flow rate at the top of the wellbore elements.

n

On 07/19/2016 01:03 PM, Jhonny Encalada wrote:

Dear Norihiro, thanks for the reply.

I think I didn’t explain well my problem. I was talking about the
extraction points(wells) in a geothermal reservoir when the pressure
and flow rate at the extraction well(s) are unknown. I read the
publication by Blocher et al. (2015); it is stated that flow rates and
pressures were calculated in OGS. Based on this fact, I was wondering
how to define this open boundary conditions so I can calculate
production flow rates and pressures given injection rates and
injection pressures.

Thanks again!

On Tuesday, 19 July 2016 11:33:21 UTC+1, Norihiro Watanabe wrote:

Since OGS is based on FEM, free boundary conditions cannot be
handled. There are some numerical hacks to imitate it, but have not
been implemented in OGS so far. If you make a domain larger and keep
enough distance from the domain boundary, influence of boundary
conditions can be neglected.

BTW Neumann conditions are supported in ST files.

best,
nori

On 07/19/2016 08:45 AM, Jhonny Encalada wrote:
 > Dear Users,
 >
 >   I was wondering how to define free boundary conditions for
 > LIQUID_FLOW. I don't want impose any pressure or flux at the
outlet of
 > my model (reservoir). I was looking for smething like Neumann
conditions
 > but OGS does not support this. Can anybody give me a clue? I will be
 > glad really!
 >
 > Jhonny,
 >
 > --
 > You received this message because you are subscribed to the Google
 > Groups "ogs-users" group.
 > To unsubscribe from this group and stop receiving emails from it,
send
 > an email to ogs-users+...@googlegroups.com <javascript:>
 > <mailto:ogs-users+...@googlegroups.com <javascript:>>.
 > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout)
<[https://groups.google.com/d/optout](https://groups.google.com/d/optout)>.

--
Norihiro Watanabe, Dr.-Ing.
Department of Environmental Informatics (ENVINF)
Wissenschaftler

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
Helmholtz Centre for Environmental Research GmbH - UFZ
Permoserstraße 15 / 04318 Leipzig / Germany

norihiro...@ufz.de <javascript:> / [http://www.ufz.de](http://www.ufz.de)
Telefon +49 341 235 1806

Sitz der Gesellschaft: Leipzig
Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703
Vorsitzender des Aufsichtsrats: MinDirig Wilfried Kraus
Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
Administrativer Geschäftsführer: Dr. Heike Graßmann


You received this message because you are subscribed to the Google
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Norihiro Watanabe, Dr.-Ing.
Department of Environmental Informatics (ENVINF)
Wissenschaftler

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ
Helmholtz Centre for Environmental Research GmbH - UFZ
Permoserstraße 15 / 04318 Leipzig / Germany

norihiro...@ufz.de / http://www.ufz.de

Telefon +49 341 235 1806

Sitz der Gesellschaft: Leipzig
Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703
Vorsitzender des Aufsichtsrats: MinDirig Wilfried Kraus
Wissenschaftlicher Geschäftsführer: Prof. Dr. Georg Teutsch
Administrativer Geschäftsführer: Dr. Heike Graßmann