Reply To: FLUENT | Mass flow-rate report at inlet surface different to the specified value

[hmanatunga]

Thanks Rob for looking into this. 

inlet-fuel is the only mass flow boundary. There is a co-flow boundary of type velocity-inlet that is defined as 1m/s in the direction normal to the boundary. There is also a larger pressure-inlet surrounding the co-flow boundary with gauge pressure set to 0 Pa (Operating pressure is 101325 Pa) The rest of the domain boundaries are pressure outlets with gauge pressure at 0 Pa. 

Why do you think the reported mass flux through the inlet-fuel different from the one that is specified at the inlet bc panel? Would the non-reflective acoustive wave model have anything to do with this?

I first came across this issue trying to run a non-premixed model of hydrogen jet flame using compressibility effects. 

Below is the latest flux report from my last saved dat file


The latest plot of the surface monitor: It decreases over time