[Abdelrahman KHAMMASH]

Hi everyone

-How much should I define the co source in the car burning in the carpark in kg/s

-How can I obtain this result (ppm) as scalar or graph as this picture

co_ppm_1-7m_withjet1.jpg


Note I used Eulerian mutliphase / VOF in the setup

Thank you very much

[bluebase]

Do you really need multiphase (VOF) here? It seems rather expensive to me for this problem. Instead i would use a passive scalar if the CO concentration is so low. I might be naive here, but do the properties of the air composition change significantly in a carpark?

The graph shown is likely a plane section through the domain showing a field function which represents the concentration of that CO phase/scalar.
Initially the scene will likely show SI units. If you do not find a unit you are looking for in the possible alternative units, then you have to define one yourself with the respective conversion factors. Have a look into the manual, and than in the units object of the project tree.

A good idea to find an approximation of how much co is sourced into the domain is by finding similar research. There you'll usually find specific boundary conditions. Such information usually is a good start to extrapolate boundary conditions to a similar case.

Hit google scholar with "cfd carpark co concentration", there is at least one accessible publication considering your application.

Best Sebastian

[Abdelrahman KHAMMASH]

Thanks for reply sir

I tried to use passive scalar , I dont know really if I use it in the right way because I use it with Eulerian multiphase . is it right or should I use with another physical setup.
Note: I used Eulerian to apply the second material (co)
Thank you again

[bluebase]

Which similar studies did you find, and what methods did they use?

As i indicated before, air quality sims regarding co is not yet in my list of experience, so i can't definitely tell what is the right approach here, and just guessed... leading to my initial question why the fluid composition cannot be assumed to be perfectly mixed.

[Abdelrahman KHAMMASH]

I found someone do it using Autodesk cfd software
https://forums.autodesk.com/t5/cfd-f...k/td-p/8140235
my study idea is simple I need a car to produce a "CO" gas then I need it to interact with air in the carpark with jet fans , the jet fans and the other boundaries I defined them normally in separate study to see if they work properly and they did.
but when I wanted to add "CO" the results was not Satisfying.
please till me if I didn't answer your question

I can give any data you need to know don't hesitate to ask .

[bluebase]

What information do you find here https://scholar.google.com/scholar?q...+concentration ?


In case you are in a country without access to services like google, you might need to find an alternative platform to find research.
If you are in an university or alike, you might ask your supervisor for recommendations.