Hello,

I am currently using OGS 5.7 on Linux.

I am attempting to run a coupled Groundwater Flow and Heat Transport problemin 3D. I would like to simulate a Geothermal Doublet System.

I would like to implement a Temperature dependent density function for the water in the reservoir.

According to the OGS documentation, this can be done using Density model #4 as shown below

- rho(T) = rho_0*(1+beta_T*(T-T_0))

The only example I can find of this implementation is in Elder_HT example (attached), however, I am not 100% sure about the order of the parameters in the input file.

Intuitively, from left to right it should be : Model # – rho_0 – beta_T – T_0

However from the example it does not make sense to have a starting temperature of -0.2, but this is also an invalid value for the volumetric temperature coefficient of water.

Can anyone please shed some light on this? Would be greatly appreciated.

Cheers,

Ariel

Elder_HT.mfp (250 Bytes)

Hi,

$DENSITY

4 1000 0 -0.2

means rho_0 = 1e3, T_0 = 0, beta_T = -0.2. The value of beta_T is not coming from real fluid property and is artificial one to demonstrate convection.

Cheers,

Nori

## ···

On 06/05/16 18:37, Ariel Thomas wrote:

Hello,

I am currently using OGS 5.7 on Linux.

I am attempting to run a coupled Groundwater Flow and Heat Transport

problemin 3D. I would like to simulate a Geothermal Doublet System.

I would like to implement a Temperature dependent density function for

the water in the reservoir.

According to the OGS documentation, this can be done using Density model

#4 as shown below

4. rho(T) = rho_0*(1+beta_T*(T-T_0))

The only example I can find of this implementation is in Elder_HT

example (attached), however, I am not 100% sure about the order of the

parameters in the input file.

Intuitively, from left to right it should be : Model # -- rho_0 --

beta_T -- T_0

However from the example it does not make sense to have a starting

temperature of -0.2, but this is also an invalid value for the

volumetric temperature coefficient of water.

Can anyone please shed some light on this? Would be greatly appreciated.

Cheers,

Ariel

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Norihiro Watanabe, Dr.-Ing.

Department of Environmental Informatics

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ

Helmholtz Centre for Environmental Research GmbH - UFZ

Permoserstraße 15 / 04318 Leipzig / Germany

Telefon +49 341 235 1806

norihiro.watanabe@ufz.de / www.ufz.de

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Registergericht: Amtsgericht Leipzig, Handelsregister Nr. B 4703

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Thanks very much for the feedback Nori, it makes sense now.

Cheers,

Ariel

## ···

On Friday, May 6, 2016 at 8:03:45 PM UTC+2, Norihiro Watanabe wrote:

Hi,

$DENSITY

4 1000 0 -0.2

means rho_0 = 1e3, T_0 = 0, beta_T = -0.2. The value of beta_T is not coming from real fluid property and is artificial one to demonstrate convection.

Cheers,

Nori

On 06/05/16 18:37, Ariel Thomas wrote:

Hello,

I am currently using OGS 5.7 on Linux.

I am attempting to run a coupled Groundwater Flow and Heat Transport

problemin 3D. I would like to simulate a Geothermal Doublet System.

I would like to implement a Temperature dependent density function for

the water in the reservoir.

According to the OGS documentation, this can be done using Density model

#4 as shown below

- rho(T) = rho_0*(1+beta_T*(T-T_0))

The only example I can find of this implementation is in Elder_HT

example (attached), however, I am not 100% sure about the order of the

parameters in the input file.

Intuitively, from left to right it should be : Model # – rho_0 –

beta_T – T_0

However from the example it does not make sense to have a starting

temperature of -0.2, but this is also an invalid value for the

volumetric temperature coefficient of water.

Can anyone please shed some light on this? Would be greatly appreciated.

Cheers,

Ariel

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Norihiro Watanabe, Dr.-Ing.

Department of Environmental Informatics

Helmholtz-Zentrum für Umweltforschung GmbH - UFZ

Helmholtz Centre for Environmental Research GmbH - UFZ

Permoserstraße 15 / 04318 Leipzig / Germany

Telefon +49 341 235 1806

norihiro...@ufz.de / www.ufz.de

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: N.N.