# HELP! change of variable

Frenchie_Girl
I'm french and my englis is bad sorry but i need help !

My exam :

In this part of the study, we considered the hypothesis of limit coat and that the gradients of pressure are negligible in this limit coat. The previous system is :

http://nsm05.casimages.com/img/2011/01/20//110120113941704087499697.png [Broken]

With limits condition of Dirichlet.

With a change of varaible, the eqaution 6.0 to 8.0 give :

http://nsm05.casimages.com/img/2011/01/20//110120113941704087499696.png [Broken]

Can you help me ?

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