ISSN:
1573-1987
Keywords:
two-point correlation equation
;
Reynolds-stress models
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A closure model for the von Kármán-Howarth-Equation is introduced. The model holds for a wide range of well accepted turbulence-theories for homogeneous isotropic turbulence, as there is Kolmogorovs first and second similarity hypothesis and the invariant theory, which is a generalization of Loitsianskiis and Birkhoffs integrals. Experimental verification supports the model in a range of reliable data and numerical calculations produces nearly identical results with the EDQNM theory. Supposing locally isotropic turbulence a moment expansion of the correlation equation brings out the production term in the ε-equation in a modified form. The deviation of $$c_{\varepsilon _1 } $$ from 3/2 emerges from the nonlocal dependence of dissipation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01082587
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