Liquid metal impurity filtration and purification numerical simulation calculation method

The invention discloses a numerical simulation calculation method for filtration and purification of liquid metal impurities. The numerical simulation calculation method comprises the following steps: establishing a geometric model of a fluid flow calculation domain of a graded filter screen; performing grid division on the geometric model of the fluid flow computational domain of the graded filter screen; calculating the stress of the impurity particles through a stress calculation model of the impurity particles in the liquid metal; calculating a momentum sink of a grid of the fluid flow calculation domain of the graded filter screen, and obtaining fluid flow distribution in the fluid flow calculation domain of the graded filter screen; impurity particle contact collision calculation is carried out according to the liquid metal impurity particle contact calculation model; according to the filter screen boundary and the impurity particle motion state, the impurity particle filtering state is judged, and impu