[HelloHelo]

Hi! I've been simulating a gas entering a liquid through small holes. I'm using the Eulerian model, but I also simulated using the mixture model. In both situations, I set the mole fraction of component X in the gas at the inlet boundary conditions. However, when I start running the calculation, the mole fraction at the inlet surface of component X is different from the one I set. I've tried activating the diffusion inlet, but it didn't work either.

[bloodflow]

Originally Posted by HelloHelo

Hi! I've been simulating a gas entering a liquid through small holes. I'm using the Eulerian model, but I also simulated using the mixture model. In both situations, I set the mole fraction of component X in the gas at the inlet boundary conditions. However, when I start running the calculation, the mole fraction at the inlet surface of component X is different from the one I set. I've tried activating the diffusion inlet, but it didn't work either.

Are you 100% you haven't specified it as a mass fraction? The default input to species is mass fraction, not mole fraction. Alternatively, Fluent is probably lying to you, if you are generating this output before solving for >1 iteration.

[HelloHelo]

I am sure. There is a box you check to input as mole fraction. I've run some other tests and now it only changes to something different from my input when I activate the reactions. But I don't think the inlet should change once it's just got in contact with the other component.