圓形容器流固耦合之有限元素模態分析

Finite Element Modal Analysis for Fluid Structural Interaction of Cylindrical Containers

王士軍(Shih-Chun Wang) ； 林益煌(Yih-Hwang Lin)

《中華民國振動與噪音工程學會論文集》 2013 (2013/06) Pp. 160-167

摘要

本研究探討圓形容器流固耦合之有限元素模態分析，使用ANSYS Workbench分析內裝有液體之容器的自然頻率與振形，並與其它文獻的結果比較，其它文獻所使用的流體元素為FLUID80，容器的結構元素採用SHELL63，若面臨容器結構的厚度較厚時使用SHELL63元素所得到之結果將會產生龐大的誤差，本研究將使用3D的固體結構元素SOLID186模擬容器結構，並採用新的流體元素FLUID220模擬容器內液體，對於薄殼容器之分析結果與其它文獻相當吻合，本研究進而探討裝有液體之厚壁容器的模態分析，以避免應用薄殼元素所可能產生之巨大誤差。

關鍵字

流固耦合 ； 有限元素法 ； 模態分析

並列摘要

This study deals with fluid-structure interaction of cylindrical structures using the finite element method. ANSYS Workbench is utilized to compute the natural frequencies and mode shapes of liquid contained within cylindrical structures. The simulation results are compared with those in the literature. In the previously reported articles, FLUID80 was used to model the fluid with SHELL63 being used to model the cylindrical container. The analysis may result in serious errors for thick containers. A 3D solid element, SOLID186, is used in this work to model the container with FLUID220 being used to model the contained fluid. The analysis results for thin structures are in good agreement with those reported in the literature. Further analysis is performed for thick containers to avoid the significant errors when the thin shell element is used.

並列關鍵字

Fluid-Structure Interaction ； Finite Element Method ； Modal Analysis