unpredictable results in a transient species run

A converged flow solution was found for turbulent flow in a reservoir. Then a tracer analysis was performed by running species transport transient on the existing flow field.
- tracer analysis highly dependent on the diffusion coefficient;
- for a certain difussion coefficient - the species virtually get stuck in a certain area and do not get convected further
- in other cases species shoot off through the domain very fast
As a first test do a contour of density for the mixture. If that's not what you expect (around ~1000kg/m^3 in the case of water)
check the density of the components. In this case the volume-weighted-mixing-law was used for density and the density for the tracer component was wrong.
Make sure that you change the default incompressible-ideal-gas law for density if the fluid
is not a gas.

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