STAR-CD+CHEMKIN combines STAR-CD, a leading code for multidimensional flow analysis, with CHEMKIN and SURFACE CHEMKIN, the leading software for chemistry and surface chemistry analysis. For STAR-CD users, a seamless methodology now exists for developing and testing reduced n-step chemistry mechanisms using CHEMKIN and then applying these mechanisms directly in their multi-dimensional flow simulations. CHEMKIN provides a means for studying complex chemistry in a wide range of classic problems, such as perfectly stirred and plug flow reactors, as a prelude to reacting flow simulations with STAR-CD. SURFACE CHEMKIN adds a sophisticated means of incorporating detailed surface chemistry in STAR-CD simulations, which is particularly important for modeling catalyst systems. For CHEMKIN users, STAR-CD provides the capability of extending their analyses of chemically reacting systems to include full 3-dimensional computational fluid dynamics (CFD) in geometrically complex systems with turbulence, sprays, radiation, buoyancy, and other transport phenomena.