Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
COMPARATIVE ANALYSIS BETWEEN STEADY-STATE GENERATION METHODS
Submission Author:
Rodrigo Tavares Veloso , RJ , Brazil
Co-Authors:
Rodrigo Tavares Veloso, Ricardo Dias dos Santos, Leonardo Santos de Brito Alves
Presenter: Rodrigo Tavares Veloso
doi://10.26678/ABCM.COBEM2019.COB2019-1830
Abstract
Reference solutions are very important in computational fluid dynamics, especially so for linear stability analysis. For this reason, several methodologies; such as minimal gain marching schemes, selective frequency damping and recursive projection methods; will be analyzed in order to generate accurate steady-state flows even when they are unstable. The chosen governing equation for the analysis is a modified Burgers equation. Unfortunately all tested methods fail under some specific conditions and, hence, must be modified. Performance was measured in terms of CPU time required to reach a solution with a certain error tolerance, where all methods were compared under optimal conditions. The Newton method is the best one whenever sensitivity to initial conditions is not an issue. Otherwise, MGM schemes perform best.
Keywords
Minimal Gain Marching Schemes, Steady-state flows, Unstable Flows, Selective Frequency Damping
