topic How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD? in CFD Forum

How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

101224474 — Tue, 16 May 2023 10:40:26 GMT

Hi everyone.

I'm having trouble simulating the air flow of a 4-direction supply grille in the room. I couldn't get any particle trace result and I'm not sure what is the reason why it doesn't have anything flow in the room.

The component at the center is the 4-direction supply grille, the ceiling was being cut to fit the supply grille because the ceiling will overlap the supply grille if not being cut. The small component at the corner is the exhaust grille, but it doesn't have the overlapping issue. The boundary condition of total heat generation can be ignored as it wasn't the main focus. The boundary condition of velocity and temperature was set on the vertical surface of the supply grille. I have also tried to put these boundary conditions on the square surface on the supply grille case but it doesn't work as well. Any helping is much appreciated.

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

marwan_azzam — Tue, 16 May 2023 12:11:47 GMT

@101224474 ,

Fascinating but it's hard to tell just based on the images you attached.

Posting the model would allow us to help.

Marwan

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

101224474 — Tue, 16 May 2023 13:42:03 GMT

Thank you for replying to me! I will attach the related file here.

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

marwan_azzam — Tue, 16 May 2023 14:36:25 GMT

Thanks for posting the model.

Your Air domain (volumes) do not make sense. You need more. You are missing the main volume between the concrete walls at minimum.

Marwan

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

101224474 — Tue, 16 May 2023 16:08:29 GMT

Hi there, I have tried to close the ceiling opening to rectify the air domain in the room. However, there is no flow detected by the particle tracing plane in the room even though I have set the inlet parameter on the square surface of the supply grille. I check using the particle tracing plane and found that the flow is being blocked in the supply grille. I suspect it is due to the model overlapping issue between the ceiling and the supply grille. Is there any way I can keep the air domain without overlapping the ceiling and supply grille models? I will attach the Rivet file and the CFD file just in case you want to check back the original file.

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

marwan_azzam — Wed, 17 May 2023 15:33:08 GMT

Hello @101224474 ,

The CAD model needs to be modified so you get the air volume(s) that you need.

I did that for you (maybe not the most elegant way but it works).

Please see attached files.

Marwan

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

101224474 — Thu, 18 May 2023 18:47:25 GMT

Thank you Marwan, the model is very good for solving the issues. This also inspire me of a different way of observing the problem. Hope you have a great day.

Re: How do I demonstrate the effect of 4-direction supply grille towards the air flow in Autodesk CFD?

marwan_azzam — Thu, 18 May 2023 18:57:26 GMT

Hello @101224474 ,

Glad the model is providing the results you are looking for.

Just keep in mind that you got to make sure you have the fluid domain needed to represent the flow.

Marwan