velocity in diffusion process
I have some confusions after modeling diffusion process in CFD-ACE
I'm doing fluid diffusion, namely, different solution in concentration, and using transient setup
In post processing, I can see the concentration change in the software, but velocity is always zero
So my question is, is that I can not expect any macro-scale velocity in diffusion process because there's actually no "real flow" created, just diffusion caused by the average kinetic energy of the molecules in the microscale?
what if I need to get the velocity field in this process, is that not possible? but actually according to my intuition, the point in the field should feel the velocity like a flow in someway, can I treat this velocity field in some way in CFD?
Anyone can help me?
Thanks in advance
Did you mean that difference in concentration leads to the varity of density in different area, so the gravity drives the fluid to flow? I am a new, just hope to join any discussion of interest.
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