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# Axisymmetric Flow

A flow pattern is said to be axisymmetric when it is identical in every plane that passes through a certain straight-line. The straight-line in question is referred to as the symmetry axis. Let us set up a Cartesian coordinate system in which the symmetry axis corresponds to the -axis. The flow is most conveniently described in terms of the cylindrical coordinates ( , , ), or the spherical coordinates ( , , ). Here, , , , and . (See Appendix C.) In particular, and .

Richard Fitzpatrick 2016-03-31