Abstract
In this paper, we present a technique for simulating free surface flow of non-Newtonian uid. The method is based on the min-max problem which automatically enforces the governing equation and the boundary conditions. The method can avoid complicated calculation of free surfaces. We apply the method to the Particle-in-Cell method and demonstrate examples of our technique simulating three problems; dam break, water drop, and concrete slump test, and the numerical simulations show plausible results.