Temperature-dependent fluid properties

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1

Dear all,
I’m using coupled Richards Flow and Heat transport for modeling heat propagation in a partially saturated porous medium.
I need OGS to change fluid properties (both water and air) in function of temperature during the simulation.
Does anyone know how to do that?
May I write a curve f(T, property value) in the .rfd file? or it works only for time-dependent curves?

thanks a lot
Nicolò

2

Thanks for quick reply Marc,
I will look for and take a look to Thomas Nagel option.
But actually I'd like to change thermal conductivity only because I'm working on T range 20-80 °C.
In unsaturated media conductivity changes because water vapour diffusion contributes to heat propagation,
this way air conductivity can change by 1 order of magnitude.
I'd like to check whether or not my experimental data are confirmed by numerics without considering vapour flow.
The output of interest is only temperature at given control points, no flow output is needed.

Cheers,
Nicolò

···

Il 06/03/2014 10.02, Marc Walther ha scritto:

Hi Nicolò,

Richards-Flow only considers the fluid, not the air. If you want air and
fluid to be assessed independently, you will need to take a look at some
multiphase/gas flow application.
Also, we generally assume local thermal equilibrium (see this eg.:
Thermodynamic equilibrium - Wikipedia ) in heat transport. I know, that Thomas Nagel added an option for non-equilibrium, if you need this.

I assume, you first want to change density or viscosity. For this, you
can take a look at models 4 (both fluid properties) in the
rf_mfp_new.cpp:

https://svn.ufz.de/ogs/browser/trunk/sources/FEM/rf_mfp_new.cpp#L918

https://svn.ufz.de/ogs/browser/trunk/sources/FEM/rf_mfp_new.cpp#L1459

and add these to your .mfp file.

Concerning the .rfd file, I know that it should work, but I am not sure
how - sorry.

Best,
Marc

On Mi, 2014-03-05 at 08:10 -0800, Nicolò Giordano wrote:

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Date: Wed, 5 Mar 2014 08:10:03 -0800 (PST)
From: =?UTF-8?Q?Nicol=C3=B2_Giordano?= <nicog86@gmail.com>
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Dear all,
I'm using coupled Richards Flow and Heat transport for modeling
heat=20
propagation in a partially saturated porous medium. =20
I need OGS to change fluid properties (both water and air) in function
of=
=20
temperature during the simulation.
Does anyone know how to do that?
May I write a curve f(T, property value) in the .rfd file? or it works
only=
=20
for time-dependent curves?

thanks a lot
Nicol=C3=B2

--=20
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<div dir=3D"ltr">Dear all,<br>I'm using coupled Richards Flow and Heat
tran=
sport for modeling heat propagation in a partially saturated porous
medium.=
&nbsp; <br>I need OGS to change fluid properties (both water and air)
in fu=
nction of temperature during the simulation.<br>Does anyone know how
to do =
that?<br>May I write a curve f(T, property value) in the .rfd file? or
it w=
orks only for time-dependent curves?<br><br>thanks a
lot<br>Nicol=C3=B2<br>=
</div>

<p></p>

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3

Dear Nicolò,

in the benchmark
\trunk\benchmarks\THM\deco_2015_b2s1\

you will find an example, how temperature dependent viscosity, density and compressibility (not activitated in this BM but explained principally) can be used within Richards flow.

Best regards,

Jobst

···

2014-03-06 11:08 GMT+01:00 Nicolò Giordano nicog86@gmail.com:

Thanks for quick reply Marc,

I will look for and take a look to Thomas Nagel option.

But actually I’d like to change thermal conductivity only because I’m working on T range 20-80 °C.

In unsaturated media conductivity changes because water vapour diffusion contributes to heat propagation,

this way air conductivity can change by 1 order of magnitude.

I’d like to check whether or not my experimental data are confirmed by numerics without considering vapour flow.

The output of interest is only temperature at given control points, no flow output is needed.

Cheers,

Nicolò

Il 06/03/2014 10.02, Marc Walther ha scritto:

Hi Nicolò,

Richards-Flow only considers the fluid, not the air. If you want air and

fluid to be assessed independently, you will need to take a look at some

multiphase/gas flow application.

Also, we generally assume local thermal equilibrium (see this eg.:

http://en.wikipedia.org/wiki/Thermodynamic_equilibrium#Local_and_global_equilibrium ) in heat transport. I know, that Thomas Nagel added an option for non-equilibrium, if you need this.

I assume, you first want to change density or viscosity. For this, you

can take a look at models 4 (both fluid properties) in the

rf_mfp_new.cpp:

https://svn.ufz.de/ogs/browser/trunk/sources/FEM/rf_mfp_new.cpp#L918

https://svn.ufz.de/ogs/browser/trunk/sources/FEM/rf_mfp_new.cpp#L1459

and add these to your .mfp file.

Concerning the .rfd file, I know that it should work, but I am not sure

how - sorry.

Best,

Marc

On Mi, 2014-03-05 at 08:10 -0800, Nicolò Giordano wrote:

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Date: Wed, 5 Mar 2014 08:10:03 -0800 (PST)

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Subject: [ogs-users] Temperature-dependent fluid properties

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Dear all,

I’m using coupled Richards Flow and Heat transport for modeling

heat=20

propagation in a partially saturated porous medium. =20

I need OGS to change fluid properties (both water and air) in function

of=

=20

temperature during the simulation.

Does anyone know how to do that?

May I write a curve f(T, property value) in the .rfd file? or it works

only=

=20

for time-dependent curves?

thanks a lot

Nicol=C3=B2

–=20

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Dear all,
I'm using coupled Richards Flow and Heat

tran=

sport for modeling heat propagation in a partially saturated porous

medium.=

 
I need OGS to change fluid properties (both water and air)

in fu=

nction of temperature during the simulation.
Does anyone know how

to do =

that?
May I write a curve f(T, property value) in the .rfd file? or

it w=

orks only for time-dependent curves?

thanks a

lot
Nicol=C3=B2
=

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