Modelación numérica CFD del flujo en una rápida escalonada incorporando tabiques triangulares alternados, con flujo de aproximación subcrítico, utilizando el programa ansys fluent.

Abstract

Computational Fluid Dynamics (CFD) is a computer technique that allows the simulation of fluid movements in complex geometries and with an extraordinary level of detail. The interest lies in evaluating the energy dissipation rates generated by the rapid echelon of original and modified geometry with alternating partitions in the tread tread. Both models have been developed in the experimental study of the PIMI 16-06-P1-T1 project, whose results are useful for the calibration and validation of the numerical models. The selected CFD trading package is ANSYS Fluent. The parameters analyzed for the calibration of the numerical model were mesh sizes and turbulence models. In this sense, the selection of the mesh size for the refinement zone was determined based on the resolution of the viscous sublayer and the application of mesh independence. While the selection of the turbulence model was made based on the sensitivity analysis of the results generated by the different turbulence models recommended by the scientific community for this type of hydraulic structures. Finally, the load dissipation values, mean air concentration and equivalent friction factor of both models were determined. The original staggered rapid is the one with the best energy dissipation rates (82.03% to 86.23%), compared to the modified rapid (78.21% to 85.24%), for the range of test flow rates.