Reacting flow, diluted species

Dear all,


I am currently simulating the reaction of a dilute compound which flows through a cylindrical tube under laminar flow conditions.

I am trying to use the physics method "Reacting flow, diluted species" to simulate this. However, Comsol keeps giving me an error and won't execute my model (even when I didn't add a reaction).

I know it is possible to solve the model for the chosen input because I made it before using 2 separate studies. In the first study I used only the "Laminar flow" physics which gave me my velocity profile.
Then I used the velocity profile of my first study in my second study which has "Transport of a diluted species" as physics. This resulted in a reaction profile under laminar flow conditions (which is what I want).

Now it is my understanding that the physics "Reacting flow, diluted species" is a combination of "Laminar flow" and "Transport of a diluted species"... Or am I wrong?

Anyway it would be very helpful if I could have only 1 study which simulates my model (for practical reasons regarding a parametric sweep and such).

I'll attach both files to this discussion.


Thank you in advance,

Rik