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We have studied the evolution of the central hundred pc region of barredgalaxies by performing numerical simulations realizing multi-phase nature ofgas. Our simulations have shown that a stellar bar produces an oval gas ringnamely the $x$-2 ring within $1~{\rm kpc}$ as the bar grows. The ring isself-gravitationally unstable enough to trigger formations of gas clouds.Although the gas clouds initially rotate in the $x$-2 ring, cloud-cloudcollisions and/or energy injections into the gas ring by Type II supernovaedeviate some of the clouds from the ring orbit. After the deviation, thedeviated clouds repeat collisions with the other clouds, which rotate in the$x$-2 ring, during several rotations. These processes effectively reduce theangular momentum of the deviated gas cloud. As a result, the gas cloud finallyfalls into the galactic center, and episodic gas supply to the galactic centertakes place.

Impulsive Gas Fueling to Galactic Center in a Barred Galaxy Due to Falls of Gas Clouds