[Edwin_lee]

Hello guys !
Since my English skills are poor, I am writing using a translator. Please understand if there are any rude or slightly incorrect expressions.
I am asking this question because I would like to run a simulation to see how carbon monoxide spreads in an enclosed space. I want to simulate carbon monoxide being injected into the internal space through the inlet. If I set the internal space to air and the inlet part to CO and then set the volumetric flow rate in the boundary conditions, a message appears saying that separate settings are needed because the two fluids are different. How should I set the boundary conditions to simulate how carbon monoxide spreads into the internal space through the inlet? This is a situation where CO enters the internal space from the inlet at the bottom. uploading modeling photos together.

Thank you for reading my post !

[mongya]

Originally Posted by Edwin_lee

Hello guys !
Since my English skills are poor, I am writing using a translator. Please understand if there are any rude or slightly incorrect expressions.
I am asking this question because I would like to run a simulation to see how carbon monoxide spreads in an enclosed space. I want to simulate carbon monoxide being injected into the internal space through the inlet. If I set the internal space to air and the inlet part to CO and then set the volumetric flow rate in the boundary conditions, a message appears saying that separate settings are needed because the two fluids are different. How should I set the boundary conditions to simulate how carbon monoxide spreads into the internal space through the inlet? This is a situation where CO enters the internal space from the inlet at the bottom. uploading modeling photos together.

Thank you for reading my post !

Hi Edwin_lee.
https://help.autodesk.com/view/SCDSE...E-D7C2E6FC75D1 according to the explanation in this link, it says to make two different types of fluids contact each other, both of them should be distributed resistance, which means they should be spread already in control volume. So the case you try to simulate is, considering the description in the link, impossible.

If what you want to do is just to observe how the different fluids interact each other, then it seems better to set property of fluid as only air and observe streamlines or check velocity profiles in the control volume.

By the way, did you set any of boundary to constant pressure?