Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ANALYSIS OF NUMERICAL METHODS FOR 1D COMPRESSIBLE UNSTEADY FLOWIN ENGINE APPLICATION
Submission Author:
Felipe Augusto Ferreira Gomes , SP
Co-Authors:
Felipe Augusto Ferreira Gomes, Waldyr Gallo
Presenter: Felipe Augusto Ferreira Gomes
doi://10.26678/ABCM.COBEM2019.COB2019-2057
Abstract
The flow characteristics inside intake and exhaust manifolds direct influence engine performance and a model capable of estimating its behavior becomes essential. Among the numerical methods, the inviscid one-dimensional (1D) approach has shown to be a suitable approximation for the problem. The method of characteristics (MC), which has first order accuracy, was the first method to be applied to gas motion inside engine manifolds with reliable results. Another widely used method is the two step of Lax-Wendroff (LW2), which has second order accuracy on smooth regions of the flow and spurious solution in the presence of shock waves and contact surfaces. The literature indicates that both methods presented similar results regarding engine performance. For this reason, two different approaches for MC; the classical method (MC-Winterbone) and the modification made by Payri (MC-Payri), and LW2 were implemented and compared with each other in a tapered pipe simulation. The results showed that MC-Payri improved the mass conservation and the quality of the estimated properties when compared to MC-Winterbone while LW2 presented consistent results against OpenWAM's.
Keywords
1D gas dynamics, intake/exhaust manifold, Method of characteristics, two step Lax-Wendroff
