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In the Galactic halo, metal-bearing Galactic halo material mixes into highvelocity clouds (HVCs) as they hydrodynamically interact. This interactionbegins long before the clouds completely dissipate and long before they slow tothe velocity of the Galactic material. In order to make quantitative estimatesof the mixing efficiency and resulting metal enrichment of HVCs, we madedetailed 2 and 3 dimensional simulations of cloud-ISM interactions. Oursimulations track the hydrodynamics and time dependent ionization levels. Theyassume that the cloud originally has a warm temperature and extremely lowmetallicity while the surrounding medium has a high temperature, low density,and substantial metallicity, but our simulations can be generalized to otherchoices of initial metallicities. In our simulations, mixing between cloud andhalo gas noticeably raises the metallicity of the high velocity material. Wepresent plots of the mixing efficiency and metal enrichment as a function oftime.

Mixing between High Velocity Clouds and the Galactic Halo