Heat transport in ground water flow

Heat transport in a ground water flow can be analyzed by combining the convection and diffusion of heat equation with the ground water flow equation. Now the velocity in the convection and diffusion of heat equation is taken from the groundflow velocity field ( $\beta_i = {v_i}^{\rm g}$ ) if groundflow_velocity is initialized. An example of a input file is given below

...
groundflow_pressure
groundflow_velocity
condif_temperature
end_initia
...
type 0 -groundflow -condif
group_groundflow_compressibility 0 ...
group_condif_conductivity 0 ...
...

If both materi_velocity and groundflow_velocity are initialized, $\beta_i = v_i + {v_i}^{\rm g}$.