Structure Of Vorticity Field Research Articles

Structure of vorticity field in compressible turbulent mixing layers

The structure of the vorticity field in compressible mixing layers is studied using direct numerical simulations of temporally evolving mixing layers. The probability distribution of the inclination angles of the vorticity vectors with respect to various axes are analyzed. Spanwise projections of vorticity vectors have a tendency to align at angles −45° and 135° with respect to the streamwise direction. On streamwise and transverse planes, the projected vorticity vectors tend to align at very small angles with respect to the mean vorticity vector. These distributions are uninfluenced by changes in compressibility. Orientations of vortex filaments, which are dominant contributors to the vorticity covariances, are also identified. These orientations are independent of the transverse location within the turbulent core. The orientations of the projections of these filaments on to different planes are found out. Compressibility has no effect on the orientation of vorticity vectors contributing most to covariances.

Hyperons polarization in heavy-ion collisions

We study the structure of vorticity and hydrodynamic helicity fields in peripheral heavy-ion collisions using the kinetic Quark-Gluon Strings Model. The angular momentum which is a source of P-odd observables is preserved within this model with a good accuracy. We observe the formation of specific toroidal structures of vorticity field. Their existence is mirrored in the polarization of hyperons of the percent order. The observed qualitative energy dependence of polarization was predicted earlier and is quantified now.