Flow assurance is a critical discipline in subsea engineering that ensures the reliable and uninterrupted transport of hydrocarbons from the reservoir to the processing facilities. It involves understanding and managing complex multiphase flow phenomena such as slugging, hydrate formation, wax deposition, and erosion that can compromise system integrity and production efficiency. CFD can simulate multiphase flow conditions in subsea pipelines, jumpers, and wellhead assemblies to evaluate pressure drops, velocity distributions, and temperature profiles under realistic operating scenarios. Simulations can further be extended for assessing erosion rates in critical subsea components (e.g., bends, tees, and connectors) by coupling fluid dynamics with particle tracking models.