Numerical Studies of the Collisionless Model Stability with respect to Any-Scale Perturbations as a Test for the Simulation Code Reliability

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Scientific paper

The various PM, P3M and PP codes were used to realize the test simulation of the non-stationary Camm sphere evolution. The results of the simulations were analyzed by using the full spectrum of small oscillations of the pulsating Camm sphere that had been obtained by Nuritdinov analytically (the Nuritdinov effect of predominance of the egg-shaped mode increment over the bar mode one is studied separately). The divergence between theoretically predicted minimal value of the unstable mode scales and the one appeared in simulations was presented. The choice of the smoothing and discretization parameters of codes for the collisionless simulation of strong non-stationary processes was discussed in connection with the shot noise dissipation.

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