The horizontal single belt casting (HSBC) process has been developed in the last 26 years in Germany and North America, as an alternative to traditional casting processes, to produce thin strips (3–15 mm thick) of various steels, and light metal alloys. At the McGill Metals Processing Centre off-campus laboratory, the process has been applied at the pilot-scale, courtesy of MetSim Inc., to successfully produce aluminum and steel alloy sheets, 200–250 mm wide. These had good mechanical properties and good surface quality. In the present work, the computational fluid dynamics (CFD) software ANSYS-Fluent v. 19.0 was used to generate a 3D transient model, which was validated against experimental HSBC pilot-scale results for casting AA2024 and AA5182 thin alloy strips. The current CFD model researches the production of strips using a slightly modified liquid metal feeding system in terms of the “free fall distance” and the type of feeding system and their effects on the initial stages of the HSBC pilot process and the quality of cast products.