Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
A Multilevel Approach in the Numerical Modelling of a Flow Accelerated Corrosion Phenomenon
Submission Author:
Pedro Henrique Augusto Mota , MG
Co-Authors:
Pedro Henrique Augusto Mota, Aristeu Silveira Neto
Presenter: Pedro Henrique Augusto Mota
doi://10.26678/ABCM.COBEM2021.COB2021-2127
Abstract
Flow Accelerated Corrosion (FAC) is a spontaneous and undesirable mass transfer phenomenon that occurs in several industries. Due to the great cost associated with the corrosion phenomenon in fluid dynamic systems, the application of different CFD techniques is necessary to obtain methods that enable the estimation of the corrosion rate with accuracy and low computational cost. In the present study, the application of a multilevel method in a sudden expansion pipe flow was evaluated to analyze the corrosion phenomenon in these fluid dynamic systems, with high accuracy and shorter computational times. For the analysis of the multilevel approach, the mass transfer phenomena and the fluid dynamics were solved considering the continuity, Navier-Stokes, and passive scalar transport equations. As for the turbulence closure modeling, the URANS model applied is the Low Reynolds Number k-ε model of Abe-Kondoh-Nagano (AKN). The advantage in applying the multilevel method for this case scenario can be explained by the high Schmidt number of the flow. With the high Schmidt number (Sc = 1460), the boundary layer thickness of the mass transfer phenomenon is lower than the momentum boundary layer thickness. With the multilevel method implemented in the MFSim software, it is possible to solve the equations that represent both phenomena in different meshes at the near-wall regions. Numerical-computational simulations were performed with the multilevel method considering the data in the literature. A moderate deviation was observed for both turbulence closure models in the region downstream the reattachment point considering the corrosion rates. Furthermore, small deviations in the corrosion rates were observed upstream of the reattachment point. Regarding the application of the multilevel method, a significant reduction in computational time with high accuracy results were obtained.
Keywords
Flow Accelerated Corrosion, Multilevel approach, High Schmidt Number
