[Jean_S]

Hello all,

I recently started using FireFoam in order to simulate burners. Especially, I would like to measure the radiative heat flux generated by a stretched flame thanks to an air inlet (with a velocity inlet which can reach 100 m/s and maybe beyond). Thus, my scenario is really simple : all the boundaries of my domain are patches, except the ground which is a wall. On the ground, I placed the burner.

In my scenario, I have a velocity inlet and a pressure outlet. Unfortunately, I have a problem with my inlet velocity. Indeed, a strange phenomena occurs at this boundary. It seems that the velocity I imposed at the entrance is "blocked" (as you can see on the picture below ; the velocity inlet is 5.2 m/s here) and generates automatically turbulence when I wanted to have a laminar flow within my domain. On the picture below, I removed the burner just for managing this problem.



I tried to change my boundaries condition, modify my mesh or my numerical schemes but the problem is still there... I am using LES for modeling turbulence.

I have the feeling it is impossible to have a laminar inlet of air using FireFoam. I wonder if the inlet conditions can only be used to model a flame (fuel inlet for example). Strangely, the fluid dynamics we can see on the picture seems to behave like a kind of pool fire with smoke generation (although there is only one air inlet)... Additionally, when I am using an other solver like reactingFoam, the inlet condition is running well. Thus, I think FireFoam is not adapted to my case.

Please does anyone familiar with Firefoam can confirm my impression?
Please ask me if you want me to provide you a file from my model.

Thank you very much for your help,

Jean