Abstract
CFD modelling is a widely used tool for computer analysis in various fields, including reactor thermophysics. Thus, in the walls of the National Nuclear Center of the Republic of Kazakhstan, for the purpose of carrying out safety analysis of irradiated devices before their in-pile tests, the program ANSYS FLUENT is used. In addition to the safety analysis of reactor tests being conducted, this program is used for the selection of test modes, selection and justification of the diagram of the change of the power of the reactor, evaluation of the thermal state of individual structural elements, etc. The special feature of the Ansys Fluent software complex is the limited functionality of the graphical user interface (GUI), which is used by most users of the program at all stages of calculation analysis from preparation of the calculation model to processing of results. On the other hand, the text-based user interface (TUI) and user-defined functions (UDF) are used less frequently, although their combined use provides extensive opportunities for optimizing the computational process, improving result quality, and saving time and computing resources. In this regard, the task of developing a specialized software (program) that facilitates easy implementation of UDF files into calculation analysis has become urgent. The article presents a console-type computer program developed in Visual Basic environment for automatic generation of UDF files based on input data. Input data are files contain time and height (radial) energy distribution profiles. Advantages of the program: easy to use (no programming skills required), speed of creation of UDF files, accuracy of writing function (elimination of errors related to manual input of a large amount of data).