THREE-DIMENSIONAL COMPUTER MODELING OF COOLING OF A CASTING AND SELECTION OF THE RUNNER OF A GATING SYSTEM BASED ON THE HEAT CONDUCTION EQUATION A. N. Chichko and Yu. V. Yatskevich UDC 669.27:519 Consideration is given to a mathematical model for computer modeling of thermal processes of cooling of alloys in gating systems that uses a cellular-automaton representation. The results of optimization of the runner dimensions for different castings obtained based on a software package that realizes three-dimensional computer modeling of thermal processes are given. JEPTER7492019998 JEPTER749208