Humidity in a bathroom - rising and falling

ChipQuick · March 31, 2025, 9:35pm

Hello,

I am trying to build a simulation for my college course that shows humidity percentage rising in a bathroom from the shower head. I would also like to show the humidity reduction when installing a fan.

Project:

CAD and current simulation setup:

I currently have a hole representing the shower head and have set it as a Velocity inlet, part8:

Fan set to part3:

And various faces, part 1, set as walls to keep the water vapor inside the model.

I have a few validation errors that are showing up while trying to generate a Mesh:

1: I cannot find which “table” information is missing and needs filled in
2: How would I fix this interfaces error, I suspect the “door” is what the simulation is mad about but I would like a door to simulate the normal layout of a bathroom.
3: If I create an inlet and an outlet for a part I only see humidity in that part instead of the whole model.
4: How would I assign a fan to a part if the simulation only wants non-solid objects?

Example for 3:

My partner was successful in getting a simulation to generate at one point with different faces of part1 set as inlet and outlet, but now it fails to run.

I did try an internal flow volume, but that generated a mass amount of errors that I did not understand, but I did start working with the “Meeting Room” tutorial to better understand it.

Overall, I need a room that generates humidity that I can manipulate with a fan.

igaviano · April 2, 2025, 9:47pm

Hi @ChipQuick, thanks for posting.

I think a first point would be that the generation of the flow volume is completely necessary - you need to go through this step before moving on with your setup.

A second point would be that, as we usually advise users, it’s better to start simple and build on complexity as you go. E.g.

Defeature your initial geometry to the most absolutely simple shapes
Generate a flow region
Understand how the boundary conditions work
Generate a mesh
Run a basic first simulation

Once you’re comfortable with that, move on to the more complex stuff such as humidity modelling. Our users find the introductory tutorials very helpful to give them these first steps!

Cheers
Igor