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The long-wavelength and low-frequency behavior of an incompressible, randomly stirred fluid is determined in d dimensions by renormalization-group arguments. A free-field fixed point, which describes conventional hydrodynamics, is stable for d>~2 although we find nontrivial corrections to the leading behavior. These corrections give rise to long-time tails in a fluid near thermal equilibrium. A nontrivial fixed point controls the behavior for d<2, which is determined to all orders in =2-d.
Forster et al. (Mon,) studied this question.