Two-way fluid-structure interaction simulation for steady-state vibration of a slender rod using URANS and LES turbulence models

• Published in: Nuclear engineering and technology 2019, 51(2), , pp.573-578
• Main Authors: Nazari, Tooraj, Rabiee, Ataollah, Kazeminejad, Hossein
• Format: Article
• Language: English
• Subjects: 원자력공학
• ISSN: 1738-5733; 2234-358X
• DOI: 10.1016/j.net.2018.10.011

Anisotropic distribution of the turbulent kinetic energy and the near-field excitations are the main causes of the steady state Flow-Induced Vibration (FIV) which could lead to fretting wear damage in vertically arranged supported slender rods. In this article, a combined Computational Fluid Dynamics (CFD) and Computational Structural Mechanic (CSM) approach named two-way Fluid-Structure Interaction (FSI) is used to investigate the modal characteristics of a typical rod's vibration. Performance of an Unsteady Reynolds-Average Navier-Stokes (URANS) and Large Eddy Simulation (LES) turbulence models on asymmetric fluctuations of the flow field are investigated. Using the LES turbulence model, any large deformation damps into a weak oscillation which remains in the system. However, it is challenging to use LES in two-way FSI problems from fluid domain discretization point of view which is investigated in this article as the innovation. It is concluded that the near-wall meshes whiten the viscous sub-layer is of great importance to estimate the Root Mean Square (RMS) of FIV amplitude correctly as a significant fretting wear parameter otherwise it merely computes the frequency of FIV. Keywords: Flow-induced vibration, Fluid-structure interaction, URANS, LES, Steady state vibration, Viscous sub-layer