OpenFOAM free software uses computational fluid dynamics through finite volume method; in adition, works the debris flow model with 98% precision in mesh refinement tests, applying the LES turbulence model: oneEqEddy. Likewise, the advance of the flow was predicted in a more consistent way, getting a behavior closer to the real one of the fluid under study comparing with other methods. In experimental model, average speeds between 2.5784 m/ s and 2.1076 m/s were obtained, and a range R² determination coefficients of 0.997 to 0.9903; and in the numerical model an average speed of 2.0572 m/s to R² of 0.974 were obtained, being the statistically similar slopes, providing the numerical model a good level of reliability to be used to simulate different behaviors of debris movement in ravines on a natural scale with accurate predictions. The three-dimensional model of debris flows reproduced the wavefront velocities with 85% precision, coinciding in shape and time in each control section of the physical model; Similarly, turnbuckles have gotten 80% accuracy, reach, and displacement of the debris flow within the ejection cone. The results of the experimental model and of the variable simulations stablish possible to model the debris flows in complex terrains with good precision.

Keywords- Debris flow, OpenFOAM software, numerical simulation, experimental ravines.