The article considers the possibility of using the method of multiphase fluid Volume of Fluid (VOF), the Ansys Fluent program, for numerical simulation of the melting process of the materials of the experimental device and their movement over the volume of the computational domain. For modeling the design of a typical experimental device tested in the reactor was selected, a two-dimensional computational model was developed, methods for solving the thermal problem were described, and the simulation results were presented.

The paper is dedicated to development of log of the ANSYS FLUENT program text commands. Although this program has well-developed and easy-to use graphical interface, command logs allow to conduct the configurations of the solver, optimizing the process of calculation justification safety of reactor experiments conducted at the “Institute of Atomic Energy” Branch of the RSE “National Nuclear Center of the Republic of Kazakhstan” (IAE Branch RSE NNC RK). Command logs allows to control the command to save the ANSYS FLUENT program solver as code in a separate file, which can later be used for other calculations. Command log allows to save settings the ANSYS FLUENT program solver as program code in a separate file, which can later be redacted and used for other calculations. Also, this would enable improving the group work of employees above one project, facilitate the exchange process of solver parameters and promptly make amendments and corrections. In the framework of this work, a technique for constructing a command log was developed for modeling thermophysical state of experimental devices in reactor experiments. The developed technique was tested on the example of solving a thermophysical task with a typical ED.