how to simulate partial differential equation in simulink?

Hello, every one i have the mathematique problem below, i'll provide the significance of each variable in the end.

This model is the reaction of trombe wall.Where:x: is the distance between the wall and the glass it will vary from.3 to .9 mete/ U: it's the air speed it will vary from 0.002 to 0.026 and T it's the temperature