Hi everyone, Could you please have a look at my maple file. Im trying to solve a set of 4 differential equations but maple takes ages to solve and doesnot give the answer at the end either. The reason can be that the equations have to high power. Do you know any other dsolve method I can use or anything I can do to fix this problem? Thank you very much! Jinny View 3868_Pressure drop 2.mw on MapleNet or Download