Tracer diffusion in a thermal gradient
This test is related to the diffusion of a non-reactive tracer in clay during a thermal gradient.
Here are the relevant parts of the test:
-
The test follows the 'HT' process in a first experiment to generate a temperature field (
TemperatureField.prj
) in the subsurface. A 8 x 4 m 2D domain is selected with finer elements on the left side (borehole) for which a Dirichlet boundary condition is applied with a temperature of 353.15 K. The initial temperature of the media is 289.15 K. -
Opalinus Clay is selected as porous media and full saturation, as well as instantaneous thermal equilibrium with its porewater is assumed.
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After one year of heating, it is assumed that the temperature profile is at a quasi-steady-state. The output of this is then used to compute temperature dependent diffusion coefficients to be used in the next part of the model.
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With a newly generated mesh containing the temperature-dependent diffusion coefficients, a second model is set up (
TemperatureField_transport.prj
) with the same geometry and the 'ComponentTransport' process. The model follows the injection of a non-reactive tracer on the left side.
Both tests TemperatureField.prj
and TemperatureField_transport.prj
run independently from each other.