CFD analysis method for muddy water pollution of vehicle body of new energy commercial vehicle

The invention discloses a CFD analysis method for vehicle body muddy water pollution of a new energy commercial vehicle, and relates to the technical field of new energy commercial vehicles, and the method comprises the steps: building a whole vehicle basic structure finite element model in a new energy commercial vehicle simulation wind tunnel according to the structure of the new energy commercial vehicle; establishing a cooling system resistance performance finite element model of the new energy commercial vehicle; establishing an electronic fan momentum source finite element model of the new energy commercial vehicle; establishing a tire droplet spraying and motion finite element model of the new energy commercial vehicle; respectively generating three-dimensional fluid domains by the basic structure finite element model, the resistance performance finite element model, the momentum source finite element model and the tire droplet jetting and movement finite element model, setting boundary conditions and