Navier-Stokes 방정식을 이용한 2차원 천음속 터빈 케스케이드의 유체유발 진동해석

In this study, a fluid induced vibration (FIV) analysis system for cascade configurations has been developed based on the advanced numerical methods based on computational fluid dynamics (CFD) and computational structural dynamics (CSD) techniques. The fluid domains are modeled using the unstructured grid system with dynamic deformations due to the motion of structural boundary. The Spalart-Allmaras (S-A) and the SST k-ω turbulent models are used to predict the transonic turbulent flows. A fully implicit time marching scheme based on the Newmark direct integration method is used in order to solve the coupled governing equations for viscous flow-induced vibration phenomena. For the purpose of validation for the developed FIV analysis system, comparison results for computational analyses of steady and unsteady aerodynamics and flutter analyses are presented in the transonic flow region.