This chapter sets forth the mathematical models commonly used to describe the
equilibrium and dynamics of fluids. Unless stated otherwise, all of the analysis is
performed using a standard right-handed Cartesian coordinate system: (x1, x2, x3).
Moreover, the Einstein summation convention is employed (which means that repeated
roman subscripts are assumed to be summed from 1 to 3). (See Appendix B.)
More information on the fundamental assumptions that underlie conventional fluid
mechanics, as well as the basic equations that describe fluid motion, can be found in
Batchelor 2000