Scour around offshore wind turbine monopile foundations is a growing concern, and solidified soil protection is increasingly recognized as a key countermeasure. Fluidized cement-solidified soil, the initial fluid state of this material, has not been thoroughly investigated, and its mechanism for scour resistance remains unclear. This study modifies a multiphase flow scour model in the OpenFOAM platform by introducing a cohesive force source term and incorporating time-varying parameters for the fluidized cement-solidified soil phase, such as porosity, viscosity, and particle diameter. The objective is to analyze the anti-scour behavior of fluidized cement-solidified soil under dynamic water conditions. Results indicate that cohesion and agglomeration between particles of fluidized cement-solidified soil enhance the soil's erosion resistance, reduce interfacial velocities between particles and fluid, and effectively inhibit scour progression. In a case study on a monopile foundation protected with this material, the maximum scour depth was reduced by 70.1% and the scour hole diameter by 48.6%, compared to the unprotected scenario. These findings provide a valuable reference for future research on the use of fluidized cement-solidified soil for scour protection in offshore wind turbine foundations.