Abstract
A study is made about the energy spectrum of turbulence on the basis of high-resolution direct numerical simulations (DNSs) of forced incompressible turbulence in a periodic box using a Fourier spectral method with the number of grid points and the Taylor scale Reynolds number up to and approximately 2300, respectively. The DNS data show that there is a wave-number range (approximately ) in which fits approximately well to Kolmogorov's scaling, where is the Kolmogorov length scale. However, a close inspection shows that the exponent is a little smaller than , and in the range fits to , where is the mean energy dissipation rate per unit mass; is the integral length scale; and . The coefficient is independent of , but has a dependence, such as , where and .
- Received 4 September 2016
DOI:https://doi.org/10.1103/PhysRevFluids.1.082403
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