No effect in concentration of constant flux boundary condition

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Dani
Posts: 9
Joined: Mon Jan 13, 2020 12:43 pm
Location: Germany

No effect in concentration of constant flux boundary condition

Post by Dani » Fri Jun 11, 2021 7:55 am

Hi all,

I am running a simple simulation (see attached file). I have a simple Richards' equation and Solute Transport.
In Richards' equation I have as boundary conditions: 1) Lower Boundary conditions: Variable Pressure Head, 2) Upper Boundary condition: Constant Flux.
I have noticed that changing the values of the Constant Flux (e.g. from 0 cm/d to 100 cm/d) does not have any effect on the concentration results at the observation points, which is sort of weird. Maybe a bug? (but I prefer to believe that I am doing something wrong.)
Could somebody tell me if in their case the results of concentration change? I would expect an increase of concentration since the constant flux on the top will act as a sort of pulling force.

Thanks

Best regards
Dani
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Jirka
Posts: 5223
Joined: Sat Mar 16, 2002 3:47 pm
Location: USA
Location: Riverside, CA

Re: No effect in concentration of constant flux boundary condition

Post by Jirka » Fri Jun 11, 2021 2:47 pm

When you use time variable BC at the bottom, use it at the top too (atmospheric or variable flux BC). J.

Dani
Posts: 9
Joined: Mon Jan 13, 2020 12:43 pm
Location: Germany

Re: No effect in concentration of constant flux boundary condition

Post by Dani » Fri Jun 11, 2021 4:41 pm

Sorry. Thanks, it works perfectly.

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