Scaling laws for partially developed turbulence
We formulate multifractal models for velocity differences and gradients which describe the full range of length scales in turbulent flow, namely: laminar, dissipation, inertial, and stirring ranges. The models subsume existing models of inertial range turbulence. In the localized ranges of length sc...
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Zusammenfassung: | We formulate multifractal models for velocity differences and gradients which
describe the full range of length scales in turbulent flow, namely: laminar,
dissipation, inertial, and stirring ranges. The models subsume existing models
of inertial range turbulence. In the localized ranges of length scales in which
the turbulence is only partially developed, we propose multifractal scaling
laws with scaling exponents modified from their inertial range values. In local
regions, even within a fully developed turbulent flow, the turbulence is not
isotropic nor scale invariant due to the influence of larger turbulent
structures (or their absence). For this reason, turbulence that is not fully
developed is an important issue which inertial range study can not address. In
the ranges of partially developed turbulence, the flow can be far from
universal, so that standard inertial range turbulence scaling models become
inapplicable. The model proposed here serves as a replacement.Details of the
fitting of the parameters for the $\tau_p$ and $\zeta_p$ models in the
dissipation range are discussed. Some of the behavior of $\zeta_p$ for larger
$p$ is unexplained. The theories are verified by comparing to high resolution
simulation data. |
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DOI: | 10.48550/arxiv.2003.06968 |