Estudo sobre a dinâmica de fluidos computacional

Abstract

Computational fluid dynamics, or CFD, is a field that deals with the numerical simulation of fluid flows, heat transfer and related phenomena, being able to calculate how operating conditions - temperature, pressure and transport properties - in three-dimensional or two-dimensional space. In this way, there is a possibility of verifying problems that a traditional simulation cannot map because it works with average parameters. This study aims to explore the CFD and the equations involved, with a demonstration and a comparison between the k-epsilon model and the SST (shear stress transport turbulence) using the ANSYS-CFD (FLUENT) tool - student license end to a mixing Tee where enter a hot fluid (water) at a temperature of 363.15 K and a velocity of 3 m / s and a cold fluid (water) at a temperature of 283.15 K and a velocity of 5 m / s thus doing a study on the behavior of the mixture. To evaluate the proposed solution, a comparison of temperature and velocity parameters was performed for each model and for each change made to the geometry. It was found that the k-e and SST model converged with a criterion of 10e-6, the two models well represent the water flow along the mixing Tee, although the SST model better represents the velocity vectors along the pipeline, despite from this the two models demonstrated confidence in the temperature variation and the fluid displacement through the mixer. The worlds made on the geometry have a satisfactory answer, thus making sure that the software is an interesting tool to perform simulations involving fluid flow.