Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
COMPUTATIONAL ANALYSIS OF THE FLOW IN A BACKWARD-FACING STEP WITH AN EXPANSION RATIO OF 1.94
Submission Author:
Deidson Vilhena Santos , RS , Brazil
Co-Authors:
Deidson Vilhena Santos, Alvaro de Bortoli
Presenter: Deidson Vilhena Santos
doi://10.26678/ABCM.ENCIT2022.CIT22-0435
Abstract
Flows over a backward-facing step (BFS) make up a branch of fluid mechanics in which many characteristics of flows are investigated. In this work, a Computational Fluid Dynamics (CFD) analysis of the flow over a BFS with an expansion ratio of 1.94 is presented. The flow equations are the set of incompressible Navier-Stokes equations, whose pressure is given by the Poisson equation. The numerical solution is obtained by the simplified Runge-Kutta method with three steps, and the equations are discretized by the centered finite difference scheme. A grid independence analysis is done for four different grid sizes, and it is observed that the optimal grid condition is for 300x25 points. Numerical results are given for five Reynolds numbers (50, 100, 200, 500, and 800), which are compared with literature data through longitudinal velocity profiles in two sections of the duct. The results of this work showed good agreement with the literature data.
Keywords
Computational Fluid Dynamics, Runge-Kutta Method, Backward Facing Step, Navier-Stokes Equations
