Hello!
I'm trying to solve a (quite simple) 2D-axissym. model of a fixed bed reactor. I have four species where only three a actually taking part in the exothermic reaction. The chemistry is modeled in re (reaction engineering module) and exported to the 2D-model where I use the following modules: tds (transport diluted species), ht (heat transfer in fluids) and br (Brinkmann-equations).
As far as I can see, I set up the model correctly. But when I want to solve it, it takes hours to assemble the matrix!!!
Is this a normal behaviour? Or where could I start finding the mistake?
Thanks in advance! Till