Print Email Facebook Twitter Reduced - complexity experiment for validating Fluid-Structure Interaction in ComFLOW Title Reduced - complexity experiment for validating Fluid-Structure Interaction in ComFLOW Author Rizos, L. Contributor Huijsmans, R.H.M. (mentor) Faculty Mechanical, Maritime and Materials Engineering Department Marine and Transport Technology / Ship Hydromechanics and Structures Programme Offshore and Dredging Engineering Date 2016-10-26 Abstract Human activities in marine environment are expanding to more remote locations, exposing offshore structures and commercial vessels to more adverse environmental conditions. On the other hand, market has a continuous demand for more cost efficient designs. Therefore, the need for more sophisticated computational tools arises. In these tools, the inherent flexibility of the structure is involved in the calculation of its loading and response, introducing the aspect of \textit{fluid-structure interaction}. The objective of the current study is to produce validation data for computational tools capable of modelling fluid-structure interaction (e.g. ComFLOW). To achieve that, an experiment is designed, conducted and its results are processed to assess their reliability. The designed arrangement includes a cylindrical flexible plate made of PTFE, placed horizontally inside a fully transparent container partly filled with water, while being attached to the bottom of a rigid cylindrical structure. The assembly is imposed to sinusoidal vertical oscillation using an electromagnetic linear drive. Due to the small scale of the arrangement and the small weight of PTFE plate, only optical instruments are used to measure structure's response. Specifically, the response of the flexible plate is measured using two instruments: a single-point laser Doppler vibrometer, that measures the velocity at a specific point of the plate and a stereoscopic set of cameras that can measure the displacements of the plate with high spatial resolution using 3D digital image correlation method. The rigid body motion of the assembly is monitored by a laser distance measurer and the imposed force is measured using a load cell. The investigated parameters include characteristics of oscillation (amplitude and frequency), the thickness of PTFE plate and its submergence depth. The results are analysed and additional tests, required for identifying noise components, are described. Using the results of these tests, a low-pass filter was applied to the measurements of the vibrometer. Having these measurements filtered and numerically integrated, cross-checking between the displacements coming from the vibrometer and digital image correlation is carried out. The results reveal that the effect of noise coming from the linear drive can not eliminated at the full extend. Once the whole process is completed, conclusions are drawn and possible actions to improve the current set-up for a next series of experiments are recommended. Subject Fluid-Structure InteractionComFLOW To reference this document use: http://resolver.tudelft.nl/uuid:445fad3d-8240-484d-b579-2b3d65f327a7 Part of collection Student theses Document type master thesis Rights (c) 2016 Rizos, L. Files PDF UploadRizos.pdf 23.03 MB Close viewer /islandora/object/uuid:445fad3d-8240-484d-b579-2b3d65f327a7/datastream/OBJ/view