With filling velocity of 0.1 m/s in ingate and temperature of liquid Mg alloy and mould at 680℃ and 200℃

respectively

flow morphology of liquid Mg alloy at center of runner and end of tangential runner of step plate was simulated by numerical simulation to understand the effects of geometric shape of runner on the flow of liquid Mg alloy in squeezing casting.The results reveal that liquid Mg alloy exhibits desirable flow morphology at the center of runner

where velocity at different direction is slightly changed at varied flow distance.However

at end of tangential runner

with reducing in equivalent radius of runner and increasing in flow distance

the velocity at x and Z directions exhibits dramatically change and velocity amplitude is obviously fluctuated at filling direction

resulting in the difficulty of control to flow morphology.