Textbook in PDF format About author Acknowledgments List of symbols Introduction User-Defined Functions in engineering practice Full source codes of User-Defined Functions Readers Content of chapters User-Defined Functions in numerical modelling of thermal processes in electric devices and machines Energy equation Modelling of source terms in the energy equation Modelling of thermal materials properties Properties for construction materials Modelling of thermal boundary conditions User-Defined Functions programming in serial version Operation order for different solvers User-Defined Functions syntax and data type Sample User-Defined Function Compilation process of User-Defined Function Model-specific DEFINE macros General DEFINE macros Looping macros in serial Node, face and cell general macros Flow variable macros for faces Flow variable and material property macros for cells Time-dependent macros User-Defined Memory (UDM) macros Miscellaneous macros Message displaying macros in serial solver File reading and writing macros in serial solver User-Defined Functions programming in parallel version Grid partitioning Communication between compute nodes Cell and face threads after grid paritioning Macros for defining compiler directives host_to_node macro for communication between the host process and the compute node processes node_to_host macro for communication between the compute node-0 process and the host process Predicate macros Macros for global reduction Looping macros in parallel solver Message displaying macros in parallel solver Macros for message passing Macros for file reading and writing in parallel solver Example of parallel User-Defined Function with Scheme statements User-Defined Functions programming for user-defined transport equation General form of the User-Defined Scalar definition User-Defined Scalar implementation Convergence improvement for User-Defined Scalar equation User-Defined Functions for User-Defined Scalar implementation for user-defined transport equation Bibliography