LINEAR-ANALYSIS OF THE COUPLED ACTION OF ROTATION AND AXISYMMETRICAL CONTRACTION ON A HOMOGENEOUS TURBULENCE, INITIALLY ISOTROPIC

This paper deals with the evolution of an isotropic homogeneous turbul ence subjected to coupled effects of rotation and axisymmetric contrac tion. It is shown through the study of the linear part of the equation s relating to the spectral tensor that rotation tends to impose the eq uality of the spectral tensor components in the local frame of referen ce and then involves energy decrease. It also greatly modifies the lin ear terms that involve the fluctuating pressure and it may explain the problems of modelling encountered seeing that flows are not only subj ected to the effects of pure deformation but also to the effects of ro tation.