Local flow structures defined by kinematic events in isotropic turbulenceThe spatial structure of turbulent motion in incompressible isotropic turbulence is investigated using a conditional average in which the conditional event specifies the local deformation tensor in addition to the local velocity vector. This average gives the best estimate of the flow field around a fixed point x given the kinematic state at x. Estimates are calculated for various kinematic states in isotropic turbulence, including pure translation, pure shear, plane strain, axisymmetric strain, and pure rotation. It is demonstrated that the large-scale motion is dominated by a vortex ring structure associated with the translational component, except at critical points of the velocity vector field.
Document ID
19890046066
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Adrian, R. J. (Illinois Univ. Urbana, IL, United States)
Ditter, J. L. (Illinois, University Urbana, United States)