Can't add air material

Does anyone know how to add air material into a project?

Hi @pandrijauskas ,

There is one step missing at the very beginning of the simulation setup: you need to create a flow region representing the fluid domain and delete the solid parts. Then you will be able to assign the fluid material to the simulation.

For more details: How to Create Flow Volume Extraction? | Knowledge Base | SimScale

Checking the tutorials would be a good idea as well.