material content section

Topics: 4.2, 4.2a

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Naser Yousefzadeh

Naser Yousefzadeh

December 22, 2012 6:28am UTC

material content section

Hi
I have a problem,please help me
in material content section i add refractive index for "sio2" but it don't have green mark.what can i do?

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Ivar Kjelberg

Ivar Kjelberg

December 22, 2012 9:22am UTC in response to Naser Yousefzadeh

Re: material content section

Hi

then green marks are the link between all the possble material properties, and thus identified by COMSOL based on the physics applicable to the domains where you attribute the material. So for some reason you have not (yet) linked the material to a domain (or if applicable to a Boundary for thin layer BC physics) such that COMSOL has not identified "n" as a required variable.

In RF optics there is a second possiblity: if your "physics" is defined using the epsilon_r material property, instead of the optical n,k properties, this might happen, but then there is a green mark for epsilon_r, if so, go to the physics node for the relevant domain/material and change the physics from epsilon_r driven to n,k driven, and that should do the job

--
Good luck
Ivar

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Lasse Flindt Kristiansen

Lasse Flindt Kristiansen

September 23, 2014 8:07pm UTC in response to Ivar Kjelberg

Re: material content section

Hi Mr. Ivar.
I am having the exact same problem.
You describe:
(...)if so, go to the physics node for the relevant domain/material and change the physics from epsilon_r driven to n,k driven, and that should do the job.

But how can I 'change' the physics?
I cant' read anywhere where epsilon_r driven is?
and I can't insert n,k driven anywhere?

I am working on extraction of oil out of a chalk reservoir and I must analyse the if extraction rate changes with increasing reservoir temperature. The reservoir is modelled as a porous medium to where I have defined its permeabilities and porosities, and the model works out fine with this.
I have tried to add a temperature in Basic Properties but it never comes out with a green -ok sign.
I also need to add Mohr-Coulomb (cohesion, friction angle) and they also appear in the Output properties, but never become green.
So my problem is assigning them to my already working reservoir.

Can anyone help please?

/Lasse

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