A Numerical Method For Fluidelastic Instability Evaluation In Nuclear ReactorSystem And Plant Components

摘要

Fluidelastic instability of reactor system and plant components is very important and full of rich dynamic interactionrnphenomena. It has been studied extensively during the past quarter of the century. Various mathematical models have beenrndeveloped to predict the instability flow velocity. The key elements necessary to predict fluidelastic instability accurately arernmotion-dependent fluid-force coefficients, which are traditionally obtained analytically or experimentally. This paperrnpresents a computational fluid dynamics (CFD) method to calculate motion-dependent fluid-force coefficients includingrnadded mass, fluid damping and fluid stiffness, based on the unsteady-flow theory. Using the mathematical model and therncharacteristics of motion-dependent fluid-force coefficients, we can predict component response more cost efficiently andrnprovides additional insights into fluidelastic instability under various conditions.