This paper broadly review the available literature for various techniques to study ,analyse and predict investigation of Casting Defects with Simulation . Computer-aided casting design and simulation give much better and faster insight for optimizing the feeder and gating design of castings.It was found that the defects like shrinkage cavity, porosity, and sink can be minimized bydesigning an appropriate feeding system to ensure directional solidification in the casting, leading to feeders . A different casting simulation software’s available for Simulate and visualize the entire process of casting part , including pouring ,solidification and shrinkage formation .Controlling shrinkage porosity depends on understanding its sources and causes.Major improvements in product quality, component performance, and design reliabilitycan be achieved if shrinkage porosity in castings can be predicted, controlled or eliminated .Also A case study on feeder.