In this workshop we will explore the extensive world of user-defined functions (UDFs), which can be used to adjust existing models, implement new models, direct CONVERGE to calculate additional quantities, initialize or reinitialize physical variables, and more. We will discuss the different types of UDFs that CONVERGE supports, the process to set up a UDF, and the UDF structure. Finally, we will go through several examples demonstrating how to effectively use UDFs in CONVERGE. *This session does not include hands-on CONVERGE practice. PREREQUISITES Introduction to CONVERGE (or equivalent introductory CONVERGE training course)