Liquid-Vapor water

Hans

Hello all, I am trying to model the pressure and temperature profile of a vessel that contains initially 2 liters of water (volume of the vessel). When the cycle starts from the inlet, water is pumped into the system, that creates pressure and therefore temperature increases due to mass augumentation. At the end of the cycle pressure decreases due to the sudden release of water from the system. I am using FLUENT real-gas model to do it. The reason is that it allows me to activate the "floting pressure", but when setting it to 300K there is an error since NIST real gas model (REFPROP v7.0) should be used just for superheated steam. Therefore the model fails since I am workin with liquid water. Is there any other suggestion or idea on how to model this process? Any imput will be appreaciated and I will try to answer any questions as I tried different ways. Thanks Hans