Multi-scale joint simulation calculation method for nuclear heat propulsion miniature reactor

The invention discloses a multi-scale joint simulation calculation method for a nuclear heat propulsion miniature reactor, and aims to solve the problems that a point reactor model is used for analyzing a reactor core part under the current system scale, the simulation approximation degree is relatively large, the reactor core space effect cannot be considered, and the simulation cost is low. And the accurate simulation process of the reactor core part in the reactor system analysis cannot be reflected. Establishing a nuclear thermal propulsion miniature reactor system simulation model under a system program based on a Modelica language, establishing a reactor core fluid-solid coupling calculation model under a reactor core scale calculation program based on an open-source multi-physical coupling framework MOOSE, and performing real-time data exchange in a TCP communication mode; multi-scale joint simulation calculation of fluid-solid coupling analysis of a reactor system and a reactor core is realized, the t