- #1
member 428835
Hi PF!
Continuity for incompressible flow independent of ##\theta## is ##\nabla\cdot u = \partial_ru_r+u_r/r+\partial_z u_z=0##. However, I'm following a problem in cylindrical coordinates, same assumptions as above, and the author states the linearized conservation of mass is ##\partial_ru_r+u_r/r+u_z## (two different authors wrote this so I doubt it's a typo). How are they arriving at this? Also, continuity is already linear in ##u##, so what do they mean by "linearized"?
Thanks for your help!
Continuity for incompressible flow independent of ##\theta## is ##\nabla\cdot u = \partial_ru_r+u_r/r+\partial_z u_z=0##. However, I'm following a problem in cylindrical coordinates, same assumptions as above, and the author states the linearized conservation of mass is ##\partial_ru_r+u_r/r+u_z## (two different authors wrote this so I doubt it's a typo). How are they arriving at this? Also, continuity is already linear in ##u##, so what do they mean by "linearized"?
Thanks for your help!