Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Numerical solution of a thermal and fluid-dynamic problem involving phase change with moving source applied to TIG welding process
Submission Author:
Solidônio Carvalho , MG
Co-Authors:
Solidônio Carvalho, Pollyana Bento, Michelle Miranda, Maurício Guilherme Alves dos Reis, Valério Luiz Borges
Presenter: Solidônio Carvalho
doi://10.26678/ABCM.COBEM2017.COB17-1204
Abstract
The numerical solution of advective-diffusive thermal problems have been the theme of countless scientific papers. The proposal of this study is to simulate computationally the fusion and solidification of metals. Among the fabrication processes of mechanical engineering, the welding occupies a prominent position. The dimensions and the shape of the weld bead denotes if the welding was applied satisfactory or not. During phase change, combined effects related to the thermal gradients, fluid-dynamics, just as gravitational and electromagnetic forces surely have strong influence on the welding pool formation. In this case, just a few authors proposed to simulate these physical mechanisms together and apply it to a welding process. Therefore, this study aims to conceive and implement computationally a thermal/fluid-dynamic model with phase change and moving source. From mathematical and computational methods and available scientific literature database it was defined an advective-diffusive thermal model. Concepts involving fixed mesh and techniques for the coupling of involved equations, as well as the solution of the nonlinearity inherent to phase change, were also themes of this work. The proposed models were validated singly and together using softwares such as MatLab and OpenFOAM. Thereunto, experimental data and information available on scientific literature were used. The results obtained demonstrate that the joint solution for the thermal/fluid-dynamic problem with phase change provides a better comprehension of the welding pool formation process.
Keywords
welding, phase change, moving source, energy, Navier-Stokes
