Open mold metal casting exposes the full complexity of fluid flow and solidification in real time. Without an enclosed gating system, molten metal is introduced directly into an open cavity where its behavior is governed by gravity, viscosity, surface tension, and thermal gradients. The pour stream itself becomes a critical variable—its velocity, continuity, and angle determine whether the flow remains laminar or transitions into turbulence, which can introduce oxide films and entrapped gases. Temperature control is equally critical. The metal must remain above its liquidus long enough to fully occupy the cavity, yet not so hot that it accelerates oxidation or excessive reaction with the mold surface. As soon as the metal contacts the mold, rapid heat extraction begins, forming a solidified layer that grows inward. At the same time, the exposed ზედ surface loses heat through convection and radiation, creating asymmetric cooling conditions. This process creates a dynamic solidificati...