Many industrial fluids (like cement paste, paints, or drilling muds) are thixotropic. This means their viscosity decreases over time under constant shear (as the particle network breaks) and recovers when at rest (as the network reforms). However, the "path" to breaking is rarely the same as the "path" to reforming. This is known as rheological hysteresis. This project aims to use simulation to determine exactly how the the particle network changes during these cycles.