pyrosim minimum density and HRR

[Alin1090]

Hello, I'm working with Pyrosim and I had meet this warning: minimun density. 0.119 kg/m3，clipped in Mesh 6.
And the HRR I calculated was supposed to peak at about 460s, but it peaked at 200s and quickly dropped to 0. How can i solve those problems?
Thank you in advance!

[drjfloyd]

Converted to discussion.

Without an input file there is no way to know for sure; however, fires require air to burn and your symptoms suggest that your inputs are not providing air to continue the fire.