natural convection

Juliet

i will simulate a natural convection by the diffrence of heat and concentration with star-cd, as you know, under natural convection, the energe or mass and momentum conversition equation must be caculated at the same time because of the couple of temperature and velocity , until now i don't know how to make subrutine and how to match it with star-cd. if someone know about this suject or did this invovled work, please contect me or tell me about it without hesitate. thank you!