Debris Flow, The Flow Field Three-dimensional Numerical Simulation Study

Debris flow is a usual natural disaster which breakout rapidly and heavy damaged. Therefore, academic and engineering field pay more and more attention to it.Based on the predecessor's research generalization, the Computational Fluid Dynamics (CFD) technology was used to numerically simulate the sticky debris flow in the paper. The CFX of current CFD was used in the study, debris flow cleuch 3D land form model was created by the software of Unigraphics (UG) and CAD, the liquid type of debris flow was defined as Bingham sticky liquid model, the dimension and distribute of velocity and pressure field were calculated by the debris flow simulation. At last, block dam was selected as an example simulated the debris flow block engineering, the pressure dimension and distribute of debris flow fluid on dam were obtained by computation. The main conclusions as following:(l)The three-dimension contour was created in AutoCAD, UG was selected as flatbase to establish debris flow cleuch 3D land form model in this study which proved that complicate three-dimension geological model could be conveniently established by CAD software.(2) Due to the configuration of debris flow was intricate, the model that teflected actual situation was hardly to calculate through the course of meshing and solving with the model, so, applying the software which was strict in the configuration of model into study meant the flow configuration must be regular.(3) The distribution of flow field and pressure field of movement of debris flow were obtained through the simulation and calculation .The maximum velocity (59.7m/s) and pressure (2.17×10~6 Pa) through the running area of debris flow were computed.(4) Debris bam was added to the model to simulate the impulse force of debris flow to the dam and the variety of debris flow field after adding the dam based on the cleuch 3D land form model. From the variety of debris flow field after adding the dam, it could be seen that the debris flow turned over the dam and was unable to be blocked by the dam. It could be concluded through comparing the variety of flow field that the velocity of liquid was slowed down, the impulse force was eliminated and the pileup...