Mixing coefficient analysis method, system and equipment based on numerical analysis and medium

The invention discloses a numerical analysis-based mixing coefficient analysis method, system and equipment and a medium. The method comprises the following steps: acquiring a three-dimensional model of a fuel assembly with a grillage rod bundle; performing numerical analysis on the three-dimensional model of the fuel assembly by adopting a CFD analysis method to obtain a CFD-based cold and hot channel temperature difference result; a sub-channel analysis method is adopted, modeling calculation is conducted under the same disclosure, and a sub-channel-based cold and hot channel temperature difference result is obtained; and comparing the CFD-based cold and hot channel temperature difference result with the sub-channel-based cold and hot channel temperature difference result, and determining the mixing coefficient under the current working condition. Compared with an existing mode of obtaining the stirring and mixing coefficient through experiments, the numerical simulation analysis method is utilized, and the