Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
CONTRIBUTIONS TO THE NUMERICAL SIMULATION OF FLOWS IN 180° CURVES AND PORTABLE WIND TUNNELS
Submission Author:
Matheus de Araujo Siqueira , ES
Co-Authors:
Matheus de Araujo Siqueira, Bruno Furieri, jane meri Santos, Philipe Uhlig Siqueira
Presenter: Matheus de Araujo Siqueira
doi://10.26678/ABCM.COBEM2023.COB2023-2400
Abstract
A cause of discussion in the recent literature is about the internal airflow of the portable wind tunnel (PWT). One of the devices used to estimate the emission rate of odorant compounds emitted by passive liquid surfaces. In this scenario, the numerical simulation of the PWT internal airflow is a key tool for its better understanding. Nonetheless, the geometry of the apparatus makes its numerical solution challenging. One of the main questions when simulating the PWT internal airflow is about the reliability of the calculations in the 180° curve. Despite that, there is a lack of experimental data concerning the airflow in this region to validate the numerical solutions. Thus, it was simulated/validated the flow inside a U-Bend which the literature presents reliable experimental velocity measurements. It was tested the use of two different turbulence models, the standard κ-ε and the SST κ-ω. So as the use of the two different mesh types, a structured and a non-structured. These data were used as input to the PWT internal airflow simulations. Notwithstanding the foregoing, when conducting the PWT simulations it was noted that the discretization order of the convective terms of the equations of momentum, turbulent kinetic energy (TKE), and its specific dissipations has a relevant impact on the results. Thus, it was tested the use of a discretization blending factor between the two methods. More accurate results for the U-bend internal flow simulations were obtained when using the SST κ-ω turbulence model and a structured mesh. To the PWT internal airflow simulations, the results showed that the use of the discretization factor between the first and second-order upwind methods equal to 0.75 has conducted the simulations to convergence maintaining a relatively great accuracy.
Keywords
portable wind tunnel, U-Bend, Computational Fluid Dynamics, Turbulence Model, Discretization order
