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R. M. Kiehn "Intrinsic Hydrodynamics with Applications to Space-Time Fluids"
Int. J. of Engng Sci. VOl 13, pp 941-949 (1975)
Abstract: Cartan's methods of exterior differential forms are utilized to
derive conformal and absolute conservation ewquations for various field
quantities in relativistic hydromechanics. In particular, Fridman's results for
the conservation of vector lines are extended to space-time situations. The
invariance concepts of Helmholtz and Bernoulli are formulated for arbitrary
frames of reference, and the separate conservation concepts of total mass and
total number in space time are distinguished and associated with the concept of
turbulence.
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