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We present hydrodynamic simulations of gas clouds inflowing from the disk toa few hundred parsec region of the Milky Way. A gravitational potential isgenerated to include realistic Galactic structures by using thousands ofmultipole expansions that describe 6.4 million stellar particles of aself-consistent Galaxy simulation. We find that a hybrid multipole expansionmodel, with two different basis sets and a thick disk correction, accuratelyreproduces the overall structures of the Milky Way. Through non-axisymmetricGalactic structures of an elongated bar and spiral arms, gas clouds in the diskinflow to the nuclear region and form a central molecular zone (CMZ)-likenuclear ring. We find that the size of the nuclear ring evolves into ~240 pc atT~1500 Myr, regardless of the initial size. For most simulation runs, the rateof gas inflow to the nuclear region is equilibrated to ~0.02 M_sun/yr. Thenuclear ring is off-centered, relative to the Galactic center, by the lopsidedcentral mass distribution of the Galaxy model, and thus an asymmetric massdistribution of the nuclear ring arises accordingly. The vertical asymmetry ofthe the Galaxy model also causes the nuclear ring to be tilted along theGalactic plane. During the first ~100 Myr, the vertical frequency of the gasmotion is twice that of the orbital frequency, thus the projected nuclear ringshows a twisted, infinity-like shape.

Hydrodynamic simulations of the central molecular zone with realistic Galactic potential