14:00
Fluid structural inter-actions II
Chair: CHANG LIN
14:00
30 mins
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NUMERICAL ANALYSIS OF MEAN DRIFT FORCE ON FLEXIBLE BARGE IN HEAD SEA
Dong-Min Park, Jung-Hyun Kim, Yonghwan Kim
Abstract: A fully-coupled fluid-structure interaction model is applied to analyze mean drift force of flexible barge in head sea. To analyze motion and mean drift force of flexible barge, a domain is decomposed into two subdomains: a fluid domain and a structural domain. The fluid domain is solved by a time domain B-spline 3-D Rankine panel method. The structural domain is modelled using a shell-element-based 3-D FEM. In the computation of drift force, a near-field method is applied; it is extended from the rigid body to the flexible body. As a test model, the Remy barge model is used. The flexible motion of numerical model is compared with experimental data for validation. The drift force of flexible barge is just compared with that of the rigid barge. The mean drift force of flexible barge decreased than that of rigid. Based on the difference of drift force between rigid and flexible bodies, the reason of the decrease of drift force is studied.
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14:30
30 mins
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EXPERIMENTAL STUDY OF THE FLUID-STRUCTURE INTERACTION NOISE OF THE HYDROFOIL
Yingbo Xu, yihong Chen, Denghai Tang
Abstract: In order to investigate fluid-structure interaction noise of the blade, the non-cavitation noise and the nature frequency of the hydrofoil are studied by experimental methods. The nature frequency of the hydrofoil was obtained in a water tank. The noise was measured under different inflow speeds and different tip constraint conditions in the cavitation tunnel. The results show that there are many peaks in the noise spectra and the frequency of the peak keeps constant with the inflow speed increasing. The frequencies of the peak are different comparing the free tip and the fixed tip of the hydrofoil. The frequencies of the peak are the same to the hydrofoil natural frequency. The natural frequency of the hydrofoil has important effect on the noise. The sound pressure of the peak is closely related to the trailing edge vortex shedding.
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