1. The problem statement, all variables and given/known data I am asked to write down the momentum (navier-stokes equations) equations in the Lagrangian coordinate system. Gravity and viscosity can be ignored. 2. Relevant equations [PLAIN]http://img443.imageshack.us/img443/974/65019601.jpg [Broken] (Eulerian Frame) 3. The attempt at a solution Am I correct in thinking that I only need to change the RHS to change with time instead of position? The RHS only contains p, so can I split this up into px, py, pz? I can't seem to find any relevant information anywhere.