Hello DrAmine,nI am modeling the droplets with DPM. But if turn off multiphase then there is not option to select vapor or liquid at inlet. Actually I am flowing only vapor at the inlet . Please see the attached image. How to select 'vapor velocity' at inlet after turning off multiphase? or should I select water-vapor in cell zone conditions for both zones to confirm only water-vapor in tube initially? So water-vapor in the tube and we will apply water-liquid mass flux through EWF at the wall to form film in the tube. Am I correct?nn