Hello;

I am not a specialist in the field, but I think that this tutorial will help you.

good luck.

thanks Hocine. I followed this example before. to convert vapour to liquid but its not work for condensation.

Dear Mohammed, you may try treat this process through User Defined functions. The trick is to reduce speed of the vapour volume to zero at the moment when it reaches the saturation temperature. Then convert this "frozen" vapour volume into liquid volume bearing the characteristics of the liquid component. Finally, "unfrozen" this liquid volume and apply your energy, motion and mass equations to reanimate the volume. This is just a rough roadmap, hope it helps.

thanks Mr Likhachev, do you mean I should do what you say in the UDF file?