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This is the mini-channel validation test.
It checks basic functionality of the Solver with a simple velocity inlet and a pressure outlet.
The velocity is slowly ramped up using the 'smooth' function for transient behavior.

The pressure drop can be taken as a validation reference.
An analytical solution can be computed by ... \todo{add formula here}
A line tracker (currently point tracker) is used to evaluate the values in the channel.
There should be a linear pressure drop, whereas small deviations near the boundaries might occur.
