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The Equation of Continuity and the Equation
of
Motion in
Cartesian, cylindrical, and spherical coordinates
This file
uses the stress
sign convention from Morrison, An Introduction to Fluid Mechanics 2013
and Welty, Rorrer, and Foster 2015
in which tension is positive.
Newton's law of viscosity: Tau=+mu dv/dx
This file uses the stress sign convention
from Bird et al. and Morrison, Understanding Rheology 2001
in which compression is positive
Newton's
law of viscosity: Tau=-mu dv/dx
Note:
the difference only affects
xpressions with tau or Pi;
the Navier-Stokes and the Continuity equation
are not affected (stress does not appear).
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