The effect of fluid flow and convection on solidified structures of aluminum, Al-0.01%Ti-0.002%B and Al-6.0%Cu alloys were studied by pouring into a mold set with a chill-block at the upper top and tilting it 90°, 60°, 30° and horizontally. Columnar grains inclined in the upstream direction to the solid-liquid interface. Grain refining effect was enhanced by convection on the solidification of Al-Ti-B alloy. The advancement of the solid-liquid interface depended on cooling by the chill-block and on convection of melt in the mold. Fine primary grains or dendrite segments ahead of the advancing interface sinked to the bottom in aluminum and Al-Ti-B alloy, but the was not observed in Al-Cu alloy.