How can I simulate the fire spread?

[LukeGiobs]

Goodmorning,

How can I simulate fire spread while considering other combustible materials?
I added other obstruction blocks near my trigger with associated burner surfaces, blocks with surfaces to which I have associated a specific material.
How do I know if it catches fire?
Thanks a lot for your help.

Have a nice day!

[mcgratta]

Search User's Guide for IGNITION_TEMPERATURE. Add boundary (BNDF) files for BURNING RATE and WALL TEMPERATURE.

[drjfloyd]

What is the BURNING RATE of a surface that is not burning?

What is the BURNING RATE of a surface that is burning?

[LukeGiobs]

So, I'm not questioning that you are very experienced and I'm not. But there's no need to act like professors who treat others poorly. That said, I do know the difference. The issue is that until we assign a curve to all layered surfaces with a cubed date, if we model elements beyond the ignition point and use materials from the PyroSim library, the simulation returns inconsistent data.
However, if the replies are going to be condescending, I'll stop asking

[drjfloyd]

You asked in your original post "How do I know if it catches fire?"

Kevin answered to look at "BURNING RATE"

you then replied "I didn't find the information I was looking for"

If you want to tell if an oject is burning, a non-zero BURNING RATE will tell you that.

If your real issue is that a pyrosim simulation is not giving you the answers you expect, that is a very different question than "How do I know if it catches fire?" In that case you need to add outputs to understand what is happening in your simulation.

-Is your target seeing enough incident flux that you would expect it to ignite?
-Is the temperature rise of your target consistent with the incident flux?
-Is the target reaching an ignition temperature?
-If it is do you see changes in the composition of the target?

Somewhere along the chain of things that must happen to result in fuel entering the domain is not working as you expect. These kinds of questions will help you suss out the issue.

[LukeGiobs]

Thanks a lot for your help.
Now I can try the new.
If is possible I have the last question.
How would you simulate a tire rack? Becouse probably my model is wrong becouse is wrong my idea. I drew 5 targets in a line, and I wanted to ignite the ones on the sides starting from the central one.
Thanks a lot for your attention and time

[drjfloyd]

I cannot tell you how to simulate a tire rack. This is not something I am going to communicate in a few moments time in this forum. You need to decide what are the objectives of your simulation, how to achieve those objectives, what data you have available, the possible options for approaching the problem, decide on an approach, implement in FDS, assess if the results have achieved your objectives, etc. These are all things you need to do as the user.