An Ansys Fluent developer works on the Fluent software, a computational fluid dynamics (CFD) program used for modeling fluid flow and heat transfer in complex geometries. They are responsible for creating, testing, and improving the software's algorithms and user interface. They deal with complex mathematical models and computational methods to simulate physical phenomena like turbulence, chemical reactions, or heat transfer. This involves programming, debugging, and validating the software to ensure accuracy and efficiency. They may also provide technical support, helping users to solve problems and understand the software's capabilities.