I am a totally new user on comsol. Now I try to simulate the mixing in the microchannel without reactions. I use the laminar flow and Transport of dilluted species. There is a similar example from comsol model library. However, I got negative concentration and the larger value beyond physic in simulation results. Somebodies say this problem can be solved by seting up logarithmic transform of concentration. But how to do that in the model of Transport of diluted specices? Please help me. Thank you so much.
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