.ClaRa.Basics.ControlVolumes.FluidVolumes.VolumeVLE_L3_TwoZones.PhaseBorder .ClaRa.Basics.ControlVolumes.FluidVolumes.VolumeVLE_L3_TwoZones.PhaseBordermodel PhaseBorder = ClaRa.Basics.ControlVolumes.Fundamentals.SpacialDistribution.RealSeparated(level_rel_start = level_rel_start);