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High-wave-number modes are eliminated in a band characterized by its width parameter {λ} in k space. The requisite conditional average is evaluated as an approximation in which coupling effects are neglected to order λ², for small {λ}. A fixed point was found under renormalization-group transformation, which corresponded to the Kolmogorov ``-5/3'' spectrum with spectral constant {α}=1.60.
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McComb et al. (1990) studied this question.
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