TEMTY, a code for large-eddy simulation of a passive scalar in isotropic turbulence, is developed and proved by successful simulation of experiment. The role of each term in the scalar equation and the concept of prefiltering the scalar equation is examined. The ratio of the exponents in the decay of velocity and temperature intensities is found to parametrize with the ratio Λ u /Λ 0 , where Λ u , Λ 0 , are the velocity and temperature Taylor microscales respectively.
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M. Antonopoulos‐Domis (1981) studied this question.
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