Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Numerical study of a free-surface laminar flow of a non-Newtonian fluid over a fixed submerged solid body
Submission Author:
William de Oliveira , RS , Brazil
Co-Authors:
William de Oliveira, Guilherme Henrique Fiorot
Presenter: William de Oliveira
doi://10.26678/ABCM.ENCIT2022.CIT22-0248
Abstract
Mass movements on steep slopes constitute risks and warnings regarding discussions of natural catastrophes. Since vulnerable regions can be violently hit, exposing human lives to danger, the search for preventive solutions is inevitable. In countries where hydrological and geological factors are present, integrating the morphological terrain aspect, mud and debris flow are examples of natural disasters. As such flow drags solid material and sediments, it is essential to know the relationship between the flow and a submerged solid body. Therefore, to understand this type of scenario, this work comprises the numerical study of a free-surface flow in an open channel presenting a bed slope angle. The fluid is non-Newtonian, viscoplastic, and approximated by the non-linear Herschel-Bulkley model. This work also evaluates an equivalent Newtonian fluid for identical boundary conditions. The computer simulation is performed in OpenFOAM, using the VOF model for the interface solution. This work initially evaluates the flow kinematics by studying the velocity and pressure fields. Then, it analyses the magnitude of the forces, drag and lift coefficients, acting on the solid body as a function of its characteristic dimension. The free-surface height evaluates the flow behavior according to its approximation with the solid body.
Keywords
Non-Newtonian fluid, CFD Simulation using OpenFoam, Fixed solid body, Herschel-Bulkley, Volume of Fluid (VoF)
