Offset of grid in the difference scheme "loap frog" for compressible fluid.

Offset of grid in the difference scheme "loap frog" for incompressible fluid.

Animation of evolution of linear perturbations in Keperian disc. Left panel show's evolution of amplitude of real part of enthalpy of perturbation that was arbitrarily selected in the form of Gaussian function of the radial coordinate. Middle panel show evolution of amplitude of real part of enthalpy of perturbation that demonstrate's the highest possible growth of acoustic energy at t=20. Right panel show's evolution of amplitude of real part of enthalpy of perturbation that demonstrate's the highest possible growth of rate in the form of canonical energy in the axisymmetric case at t=20. For all panels azimuthal number equal's to m=5. Inner boundary of the disk is located on the radius r=1. The disk rotates counterclockwise. Amplitude of perturbation is normalized to a unite maximum amplitude. See paper for more details.