| CHEN Zhengshou,KIM Wu-joan,CHOI Yoon-rak. 2009. Numerical simulation of a short flexible pipe subject to forced motion and vortex-induced vibration. Acta Oceanologica Sinica, (6):70－83 |
| Numerical simulation of a short flexible pipe subject to forced motion and vortex-induced vibration |
| Numerical simulation of a short flexible pipe subject to forced motion and vortex-induced vibration |
| Received:December 15, 2008 Revised:May 17, 2009 |
| DOI： |
| Key words:force oscillation vortex-induced vibration (VIV) fluid-structure interaction (FSI) ANAYS MFX instantaneous amplitude |
| 中文关键词: force oscillation vortex-induced vibration (VIV) fluid-structure interaction (FSI) ANAYS MFX instantaneous amplitude |
| 基金项目:Korea Research Foundation Grant funded by the Korean Government (MOEHRD, Basic Research Promotion Fund) (KRF-2008-D00556) and Mokpo National University RIC for Midisize Shipbuilding. |
| Author Name | Affiliation | E-mail | | CHEN Zhengshou | Engineering College, Ocean University of China, Qingdao 266100, China
Department of Naval Architecture & Marine Engineering, Mokpo National University, Mokpo 534-729, Korea | | | KIM Wu-joan | Department of Naval Architecture & Marine Engineering, Mokpo National University, Mokpo 534-729, Korea | kimwujoan@mokpo.ac.kr | | CHOI Yoon-rak | School of Naval Architecture & Ocean Engineering, University of Ulsan, Ulsan 680-749, Korea | |
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| Abstract: |
| A series of numerical simulations about a small scale (aspect ratio:63.2) flexible pipe undergoing forced harmonious oscillation and vortex-induced vibration (VIV) have been taken into account. The wake hydrodynamics and pipe deformation were accomplished by ANSYS MFX solution strategy designed for fluid-structure interaction (FSI) problem with well-performed LES model. The configuration of structured mesh, multi-domain design, different mesh stiffness admeasured by User Fortran ensured that the numerical task was competent to deal with large deformation related to this case. The introduction of instantaneous amplitude definition and modeless component decomposition method (Chen and Kim, 2008) was helpful to reveal much more information from modal analysis. Most results from numerical simulation are generally consistent with those from model test (Choi and Hong, 2000) via the comparison between them. As supplementary to model test, visualization of the vortex wake was also provided. It has been proved that the forced oscillation doesn't only excite a complicated dumbbell-like wake pattern around the outer thimble, but also results in inner flow inside the PVC pipe. The velocity of the inner flow increases with the frequency of forced oscillation. |
| 中文摘要: |
| A series of numerical simulations about a small scale (aspect ratio:63.2) flexible pipe undergoing forced harmonious oscillation and vortex-induced vibration (VIV) have been taken into account. The wake hydrodynamics and pipe deformation were accomplished by ANSYS MFX solution strategy designed for fluid-structure interaction (FSI) problem with well-performed LES model. The configuration of structured mesh, multi-domain design, different mesh stiffness admeasured by User Fortran ensured that the numerical task was competent to deal with large deformation related to this case. The introduction of instantaneous amplitude definition and modeless component decomposition method (Chen and Kim, 2008) was helpful to reveal much more information from modal analysis. Most results from numerical simulation are generally consistent with those from model test (Choi and Hong, 2000) via the comparison between them. As supplementary to model test, visualization of the vortex wake was also provided. It has been proved that the forced oscillation doesn't only excite a complicated dumbbell-like wake pattern around the outer thimble, but also results in inner flow inside the PVC pipe. The velocity of the inner flow increases with the frequency of forced oscillation. |
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