How to model half channel in Fluent
 

Hi everyone,

I'm trying to model a microreactor with 2 microchannels and a wall between them.
I want to include half of each channel and wall between them into my model because of symmetry. But I have problems in the geometry part, I should do 2D modeling but in design modeler it gives error to my 2D sketch. How can I model 2 half channels in designmodeler?