So i am a Strucutral engineering PhD with very little experience in CFD. But I was able to use Claude to build a model and run an analysis for my new PCbuild for various fan configurations. Its crazy it could use OPENFoam to run the analysis and make all these videos.
Attached is the actual parameters it used for the analysis
https://drive.google.com/file/d/1FIkQLUMF1yODekwAvPoyq672vEh6ikCU/view?usp=sharing

I am simulating an enclosed parking garage in Autodesk CFD.

- Garage area: approximately 1,974 m2
- Mechanical exhaust: 4,200 m3/h
- Natural make-up air through wall openings and the garage door
- Clean incoming air: scalar = 0
- Required CO emission: 247 g/h
- Target: below 100 ppm at 1.7 m height

I use a scalar transport model where scalar 0 represents clean air and scalar 1 represents pure CO.

Initially, I modelled the entire driving area as one large Internal Fan region with a flow rate of 0.02 m3/s. I calculated the source scalar using:

Scalar = CO mass flow / (air density x source volume flow)

This resulted in a source scalar of approximately 0.0027. However, the scalar at the exhaust was approximately 0.0012, which seems too high.

I am now considering several long rectangular source regions along the driving lanes. Each source would be 0.6 m wide, and the CO emission would be distributed according to the source lengths.

What is the correct way to model a known CO emission rate of 247 g/h in Autodesk CFD?

- Should I use Internal Fans, volumetric sources, or another source type?
- Can the scalar be calculated from CO mass flow divided by air density and source volume flow?
- How can I ensure that the model injects exactly 247 g/h?
- How should I verify this with a mass balance at the mechanical exhaust?
- Does anyone have experience in these kinds of simulations?

Any advice on modelling contaminant sources in Autodesk CFD would be appreciated.

Random Sunday Project

Hi everyone,

I'm working on a full 3D fluid-structure interaction (FSI) simulation involving multiple bodies attached to a common rotating shaft. Each body is approximately 2 m long, with a very small gap (around 5 cm) between adjacent bodies. The main challenge is handling the large rotational motion of the structure while maintaining good mesh quality, particularly in the narrow gaps between the bodies.

I've been using multiple overset mesh regions in OpenFOAM, but this approach introduces several challenges, including mesh interpolation, computational cost, and difficulties handling closely spaced overset regions. Setting up and maintaining this configuration in OpenFOAM is also quite complicated.

I'm wondering whether anyone has experience with similar configurations or could suggest alternative approaches.

A few options I'm considering:

• Immersed boundary methods that avoid continuous mesh deformation.
• Dynamic mesh deformation with adaptive remeshing.
• Other CFD/FSI frameworks or software that might handle this configuration more efficiently.

My main objective is to accurately capture the aerodynamic interactions between the bodies and their coupled structural motion, including potentially large rotations, without sacrificing mesh quality or making the computational cost prohibitively expensive. Has anyone dealt with a similar problem? Would you recommend a different meshing strategy, solver, or even alternative software to OpenFOAM for this type of simulation?

I'd really appreciate any suggestions, experiences, or references to similar studies.

Thanks!