Abstract
To accurately and efficiently calculate the dynamic characteristics of squeeze film damper (SFD), the influences of different parameters on computational fluid dynamics simulation were analyzed. The simulation was verified by theoretical formula of SFD based on the short bearing and semi-oil film hypothesis considering the oil film inertia force. Numerical simulation results have shown that mesh stiffness value can guarantee the convergence without influence on results. The mesh sizes have obvious influence on simulation results, while the influence of circumferential mesh size is comparatively weak. When there are more than 200-time steps in a cycle or more than 2 cycles are selected, it will take more computation time but with less influence on results. When the length-diameter ratio of SFD is smaller, the numerical calculation results have a better agreement with the theoretical results. The research will provide a reference for the options of simulation parameters of SFD while taking into account both analysis precision and computer time.
Highlights
Squeeze film dampers (SFDs) aid to reduce rotor vibration and isolate a rotor from a stator or housing [1]
In order to accurately and efficiently predict the dynamic characteristics of squeeze film damper (SFD), firstly, the numerical computational fluid dynamics (CFD) results calculated by Ansys-CFX software were verified by the theoretical formula of SFD based on the short bearing and semi-oil film hypothesis considering the inertia force of the oil film
The reasonable parameter settings of CFD simulation are provided for predicting SFD dynamic characteristics when a balancing act takes into account both the analysis precision and the time consuming of computer
Summary
Squeeze film dampers (SFDs) aid to reduce rotor vibration and isolate a rotor from a stator or housing [1]. Boppa et al [11, 12] established the 3D numerical simulations model of SFDs in Fluent to determine the effect of changing groove size on the pressure profile. They observed that addition of the central groove reduced the rigidity developed in the film land when running at higher speeds. In order to accurately and efficiently predict the dynamic characteristics of SFD, firstly, the numerical CFD results calculated by Ansys-CFX software were verified by the theoretical formula of SFD based on the short bearing and semi-oil film hypothesis considering the inertia force of the oil film. The reasonable parameter settings of CFD simulation are provided for predicting SFD dynamic characteristics when a balancing act takes into account both the analysis precision and the time consuming of computer
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