Both hydraulic simulation and numerical simulation were used to optimize casting technology in order to ensure the quality of large aluminum alloy castings. Based on analogic theory

hydraulic model was founded to choose the optimum gating system for prevention from casting defects including gas hole and misrun. Numerical simulation was used to predict shrinkage cavity

porosity through calculating dynamic temperature field of aluminum casting. Based on numerical simulation

riser and chill size and amount were changed and casting solidification sequence was controlled to ensure inner quality of casting. At last

both hydraulic simulation and numerical simulation were synthesized to determine rational processing sketch for pouring success at first time