Fe-based amorphous alloysAmorphous alloys exhibit outstanding propertiesProperties, and achieving large-scale production is crucial for reducing costs and advancing industrial development. The melt puddle formed between the nozzle and the copper wheel critically governs throughput and product quality. This study develops a two-dimensional, transient multiphase model coupling fluid flow and heat transfer to analyze the effects of processProcess parameters on puddle spread, ribbon thickness, and the temperatureTemperature field of the copper wheel. The results show that after the melt contacts the wheel surface, the gas channel becomes segmented, upstream recirculation produces a localized hot spot adjacent to the nozzle wall, while a continuous near-wall temperatureTemperature band forms downstream. Under quasi-steady casting, the upstream meniscus assumes a C-shape profile and the downstream meniscus a sloped profile. Increasing either the melt-injection temperatureTemperature or the injection velocity increases the puddle spread and ribbon thickness, while accelerating wheel heating and raising its steady-state surface temperatureTemperature. Notably, the injection velocity has a stronger impact, with an increase from 1 to 1.75 m s−1 raising the ribbon thickness by 3.7 μm and the maximum copper-wheel surface temperatureTemperature by 65.3 K. These results provide quantitative guidance for parameter selection in planar-flow casting to improve ribbon uniformity and performance and to extend copper-wheel service life.