[mike.franky]

Hi,

I am using the reactingMultiphaseEulerfoam to simulate evaporation of water at the interface of a bubble column. The mixture has a very small mass fraction of water (3x10^-5). I am using the Arden Buck saturation model. The temperature is 15 decgrees Celsius and the liquid is at atmospheric pressure. When I start the simulation, the the liquid water mass fraction goes to negative values almost instantly in a large number of cells. On the other hand, the mass fraction of the water vapour does not increase accordingly. Therefore, I believe that this must be some issue regarding numerical accuracy. Has anyone experienced anything similar or can shed some light as to how to overcome this problem?

Thanks in advance for any help

Cheers
Mike

[Vitor Monteiro]

Originally Posted by mike.franky

Hi,

I am using the reactingMultiphaseEulerfoam to simulate evaporation of water at the interface of a bubble column. The mixture has a very small mass fraction of water (3x10^-5). I am using the Arden Buck saturation model. The temperature is 15 decgrees Celsius and the liquid is at atmospheric pressure. When I start the simulation, the the liquid water mass fraction goes to negative values almost instantly in a large number of cells. On the other hand, the mass fraction of the water vapour does not increase accordingly. Therefore, I believe that this must be some issue regarding numerical accuracy. Has anyone experienced anything similar or can shed some light as to how to overcome this problem?

Thanks in advance for any help

Cheers
Mike

Have you solved your problem?

I'm trying to understand your problem: are you simulating water evaporation under 15 °C (atmospheric pressure)? How could this be possible?

OpenFoam8 has a interface model to simulate this. However, its used temperatures about 400 K.