Indoor flow calculation of complex geometry

I want to calculate the flow in a space with square bulges on the ground( for some reasons I have to use Creat Case From Geometries). However, the result does not show the obstruction of the square bulges to the flow. I don’t know how to get it right, please help me out!

Can you share your grasshopper files?

If you want to create the box as a closed surface separate from the rest of the wall, try to create the bottom of the box slightly below the floor.