A few remarks are made about the average dissipation of energy in unsteady turbulent flows, and the way in which it is modeled. Some suggestions are made that place the customary models on a more rational basis, and which lead to an improved model. Sample calculations with the improved model are presented. From time to time, philosophical comments are made about turbulence as a field, theoreticians, and other subjects.
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J. L. Lumley (1992) studied this question.
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