上游充通大学 SHANGHAI JIAO TONG UNIVERSITY FLUENT Overview User-Defined Functions(UDFs) UDF is a user self-compiled program that can be dynamically connected to the Fluent solver in order to extent the functions of FLUENT program or improve functional. UDF can make FLUENT simulate actual problems encountered in production and construction better and improve solver performance.FLUENT Overview User －Defined Functions(UDFs) • UDF is a user self-compiled program that can be dynamically connected to the Fluent solver in order to extent the functions of FLUENT program or improve functional. • UDF can make FLUENT simulate actual problems encountered in production and construction better and improve solver performance