[Richard Beauchamp]

Hi,

I have been trying recently to simulate the mixing of CO2 in air. To do that, I have created two blocks using Hexpress Hybrid, one containing each fluid. I also have put the proper fnmb conditions to insure that the flow through one block can get to the other.

Thus, I have an inlet of CO2 and an FNMB allowing the CO2 to enter the AIR domain.

Unfortunately, I am not able to see any mixing. I can see the speed gradiants caused by the CO2 entering the domain. Also, since the CO2 has a slightly higher temperature, I can see the temperature gradiants develop in the AIR domain.

However, when I try to map the evolution of the GAMMA parameter (Ratio of specific heats), it remains purely constant in the air domain.

I have seen that in the OUTPUT window, there is an option for multi-species output. However, I am unable to access it. It leads me to beleive that it is some type of flow model that I need to activate.

Unfortunately, I have not seen this obtion anywhere.

Can anybody tell me how to do a mixing simulation (multi-species simulation)?

This would be really appreciated.

[tdrerwann]

Hello Richard,

I would suggest that you have a look at the User manual, section 9-9 "Multi-species Framework" (and Theoritical manual section 8-8) + Section 3-2.7.

Also, it is not strictly necessary to create 2 blocks to run a multispecies simulation unless you need it for other reasons.
You could define one block with the boundary conditions defined by means of OpenLabs.

I hope this is useful.
Regards

[Richard Beauchamp]

First, I would like to thank you for helping. It is really appreciated.

Unfortunately, I am using a computer in my school's aerospace engineering department, and I have no idea where the user manual is. I have search extensively through the different folders of the computer and through the different servers available, but I am unable to find it.

Can you tell me just the basics of this section, I guess I can figure out the rest for myself.

Thank you again,