Summary
Homogeneous and isotropic turbulence has been discussed in the present paper. An attempt has been made to find the simplifying hypothesis for connecting the higher order correlation tensor with the lower ones. Starting from the Navier-Stokes equations of motion for an incompressible fluid and following the usual method of taking the averages, a differential equation in Q and X, the defining scalar of the second order correlation tensor Q x and the defining scalar of a third order isotropic tensor X ijk , has been derived. The tensor X ijk stands for a tensorial expression containing the derivatives of the third and the fourth order tensors. Then the hypothesis is used that X=F(Q), where F is an unknown function. To find the forms of F, Kolmogoroff's similarity principles have been used, and thus two forms for F(Q) corresponding to two regions of the validity of these principles have been deduced.
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Jain, P.C. A theory of homogeneous isotropic turbulence. Appl. sci. Res. 8, 219–227 (1959). https://doi.org/10.1007/BF00411751
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DOI: https://doi.org/10.1007/BF00411751