Ok, so I solved the unsteady laminar fluid flow in the tube im looking at. Now, I want to add in a mass transport problem. Say I have a sphere of concentrated dye at the center of the tube, and want to see how it diffuses given my velocity profile, how would I go about doing that? I made a second spherical domain (to act as a sphere of dye initially) inside the cylinder, but when I go to initial condition for concentration, it wont let me select just the sphere domain ( i also have to select the cylinder). Also, I'm wondering how to connect the sphere and cylinder so that the fluid flow and mass transport problems "talk to each other" for lack of better words. Not sure if this is clear but hopefully it is! Thanks in advance!
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