I have imported a stl from tinkercad. It is a simple pipe. I pre-processed the pipe in CAD mode to define the Flow region, but I still have my original geometry identified as Solid 1. If I try to run the simulation, I get error:“Please ensure that all CAD entities are assigned a material or advanced concept. Missing material or advanced concepts were detected for the following entities: solid1”.
I have assigned the Flow region as air. But I cannot figure out how to assign a material to Solid 1. I also cannot figure out how to remove Solid 1.
Should I be removing Solid 1 or assigning a material to it?
Hi @bgleckle1 thanks for posting on the forum and welcome to the SimScale Community 
This message appears because the Incompressible analysis type does not take into account solid-fluid interactions and you should only simulate the flow region part of your domain - in short, the right approach is to delete the solid part. To delete the “Solid 1” you can use a delete body operation in CAD Edit.
Another point is that we usually advise users to avoid using STL files for simulation. Since you have a simple cylinder, could you try remodelling it and exporting as Parasolid or STEP instead?
Cheers
Igor
Deleting my original geometry with the CAD mode “delete body” did it!
Thank you!
Brad