Abstract
This paper focuses on fluid forces acting on a confined cylinder subjected to axial flow in application to fuel assembly dynamic behavior. From the literature, it is difficult to estimate the damping induced by the flow. Therefore, it is proposed to study numerically the damping fluid forces on a cylinder for various parameters. It has been observed that it increases with the smaller confinement and with the presence of an obstacle and decreases when the Reynolds number increases. Larger values correspond to a greater contribution of pressure forces. Dynamic simulations are compared to the steady ones and give different values, but the order of magnitude and general trend remain the same. Therefore, steady simulations are suitable to have a rough estimation of drag coefficients in dynamics.
Highlights
Fluid-structure interaction issues can be encountered in many nuclear power plant components [1]
Axial flow strongly modifies the dynamic behavior of the whole fuel assembly [4, 5] by added stiffness, damping, and mass
E purpose of these simulations is to obtain the fluid forces acting on a cylinder subjected to a slightly inclined axial flow
Summary
Fluid-structure interaction issues can be encountered in many nuclear power plant components [1]. It is difficult to estimate the damping of a structure under axial flow as the range of value for Cn and the dependency on various parameters seems wide. Erefore, it is proposed in what follows to study numerically the damping fluid forces on a cylinder for various parameters. After an entry length Lin, the confinement walls are inclined of the angle b over the length Lincl. E entry length Lin is sufficiently long to have a developed velocity profile at the beginning of the inclined region, and the length Lout is chosen sufficiently long so that the outlet boundary condition does not affect the flow in the inclined region. E purpose of these simulations is to obtain the fluid forces acting on a cylinder subjected to a slightly inclined axial flow. Jy ey ex Figure 1: Confinement geometry at midplane Lincl/2
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
