Condensation with VOF fluent
 

Hi, I'm working in a project and I need to simulate the condensation from steam to water. I'm using VOF but I have a problem: my cold fluid is liquid water and my hot fluid is steam (VOF_air=0.8 VOF_vapor=0.2), according to my thermodynamic simulation VOF_air value has to increase and steam value decrease because it is condensing. Air is disappearing and at steam outlet it is VOF_air=0. Could someone help me with that?