Temperature of rain in a heat flow model

Hi,

I model heat flow in FEFLOW 5.4.  I have set up a constant precipitation, but how do I assign a temperature to the rain?  I want to use a constant temperature.  If I do not assign a temperature to the rain, what temperature does it enter the model domain with?

Cheers, Lars

Hi Lars,

The temperature of the recharge infiltrating through the ground surface is usually applied by a first kind heat BC on the models' top. EDIT: If you don't use a first kind heat BC and the flow recharge is set by source/sink (elemental material parameter), the flux will adopt the REFERENCE temperature when it enters the model. You can verify this in the Reference Manual, page 55, Eq. (3-17) for an unconfined aquifer: The last term reads ?[sup]f[/sup]*c[sup]f[/sup]*Q[sub]?[/sub]*(T-T[sub]0[/sub]) = Q[sub]T[/sub] (the overlines on the Q's missing...). Q[sub]?[/sub] refers to the flow source sink, Q[sub]T[/sub] is the resulting heat flux, which shall here be 0. Distributing and equating yields T = T[sub]0[/sub]; T is the node temperature and T[sub]0[/sub] the reference temperature.

Cheers,

Bastian

Good - then my model is set up correct  :)

Thanks for the answer.

- Lars