Numerical simulations of a quasiperiodic regime in the stellar-gaseous disks of barred galaxies

Numerical simulations of the dynamics of the stellar-gaseous disk of a flat galaxy are presented. The simulations are based on integration of the equa tions of motion for the particles in the three-dimensional stellar disk cou pled with solution of the complete system of two-dimensional gas-dynamical equations describing the gaseous disk. The existence of a quasiperiodic reg ime for the disk evolution discovered earlier during hydrodynamical simulat ions is confirmed. Intense flows through the central region of the disk ass ociated with the saddle point of the bar potential may provide a mechanism for supporting the nuclear activity in Seyfert galaxies.