Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Fluid-structural numerical evaluation of the efficiency of a flow atenuator device through variations in the modulus of elasticity
Submission Author:
Pedro Bis , ES , Brazil
Co-Authors:
Pedro Bis, Matheus Campos Vieira, Gustavo Cordeiro Barreiros, João Paulo Barbosa, Renato Siqueira, Ayrton Cavallini Zotelle
Presenter: Gustavo Cordeiro Barreiros
doi://10.26678/ABCM.COBEM2023.COB2023-1436
Abstract
In many industrial conditions, positive displacement pumps are used to move fluids with high viscosity or over long distances. In this type of pump, the liquid receives pressure energy through the action of forces directly linked to the movement of a piston or diaphragm, resulting in discharge flows that have a pulsating characteristic, which generates vibration and wear problems in the piping system. Flow atenuators are devices that operate based on an energy absorption and restitution mechanism to promote stability in pulsating flows and mitigate the effects caused by positive displacement pumps. Among the attenuators available on the market, the models that use inflatable gaseous fluid are the most used, however, they are dependent on thermodynamic parameters that make their use unfeasible in certain industrial activities. Thus, this work aims to contribute to the development of the study of attenuators that operate through an elastic structure, numerically analyzing the influence of the variation of the modulus of elasticity in 1, 2, 3, 4 and 5 MPa in the efficiency of mitigation. For this, the three-dimensional model of fluid-structure interaction implemented in the commercial software Ansys® Workbench 2020 R1 was used. The iterations of the simulations were scaled between two solvers: one for the structural analysis, based on the finite element method (FEM), and another for the calculation of computational fluid dynamics (CFD), which together modeled the turbulent flow of water at a Reynold's 3820 under a cylindrical deformable frame 400 mm long, 1 3/8” in diameter and 1 mm thick. The results demonstrate that the reduction of the modulus of elasticity of the material used as a continuous deformable medium of the attenuator causes an increase in the absorption capacity and energy restitution and consequently a higher level of attenuation. The best values are found for the 1 MPa case, which presents an attenuation level close to 77% of the inlet flow, a value that corresponds to a 37% increase in attenuation in relation to the 5 MPa case.
Keywords
Simulation, flow attenuators, elastic modulus, Fluid-structural
