inertial instability[i′nər·shəl ‚in·stə′bil·əd·ē]
Generally, instability in which the only form of energy transferred between the steady state and the disturbance in the fluid is kinetic energy.
The hydrodynamic instability arising in a rotating fluid mass when the velocity distribution is such that the kinetic energy of a disturbance grows at the expense of kinetic energy of the rotation. Also known as dynamic instability.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.