Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
FLUID-STRUCTURE INTERACTION FOR CANTILEVER PLATES IMMERSED IN AIR AND WATER USING SOLID ELEMENT IN STRUCTURE SUBSYSTEM ON MFSIM (IN-HOUSE SOFTWARE)
Submission Author:
Freddy Portillo Morales , SP
Co-Authors:
Freddy Portillo Morales, Aristeu Silveira Neto, Aldemir Ap Cavalini Jr
Presenter: Freddy Portillo Morales
doi://10.26678/ABCM.COBEM2021.COB2021-1413
Abstract
Numerical simulation has advanced rapidly over the past decade, and new mathematical and numerical models have emerged in order to describe the physics of problems with greater fidelity. This work addresses a fluid-structure interaction problem in a partitioned way, solving the fluid subsystem and the structure subsystem separately. The first is solved using the Finite Volume Method (FVM) and the second with the Finite Element Method (FEM), using the immersed boundary method (IBM) to communicate these two subsystems. For the discretization of the structure subsystem, Hexa-8 with incompatible modes solid elements are used, this type of elements allows the modeling of complex geometries that could not be modeled with beam and plate elements. Virtual experiments were carried out and compared with the results obtained experimentally by Lindholm et. al (1965). The experiments consisted of applying an instantaneous force to the free end of the plate (pluck test) and measuring its displacements over time, these data are treated with the use of a Fast Fourier Transform (FFT) and thus obtained the natural frequencies of the structure taking into account the effects of the fluid in which it is immersed. The results obtained were satisfactory, the maximum errors obtained in relation to the material experiment were 4.74 % for plates in a vacuum, 8.85 % for plates submerged in air and 14.55 % for plates submerged in water. The validation of these preliminary results is part of the implementation of solid elements in the MFSim computer program, developed by the Fluid Mechanics Laboratory (MFLab) of the Federal University of Uberlândia (UFU) in partnership with Petrobras.
Keywords
fluid-structure interaction (FSI), Finite Element Method, Hexahedrical elements, Incompatible modes, Extra shape functions
