Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Circulating Water Channel for Investigations of Fluid-Structure Interactions in Low Reynolds Numbers
Submission Author:
André Fujarra , SC
Co-Authors:
Monique Ellen Bruner, Karen Soares, Felipe Rank Teixeira, André Fujarra, Rayza Yasmin Vicente Cenci
Presenter: Karen Soares
doi://10.26678/ABCM.COBEM2023.COB2023-1470
Abstract
This work originally contributed with results in a Circulating Water Channel (CWC) applied to low Reynolds number investigations of the Fluid-Structure Interaction (FSI). It is important to note that, when looking for work on FSI in water flows corresponding to low Reynolds numbers, it is noted that the overwhelming majority of them are dedicated to the investigation of vortex-shedding models and their effects in terms of the efforts generated on the stationary structures. On the other hand, few results are found in the dynamic condition, i.e. the one in which the structures subject to flow are free to oscillate with at least two degrees of freedom in regimes of low Reynolds numbers, Re<10³. Although seemingly easy to conceive and understand, experiments under these circumstances are extremely demanding and challenging to perform, possibly as justification for the scarce availability in the literature. In this scenario, therefore, this work presents the CWC recently built at UFSC-Joinville, funded by CNPq with the primary objective of investigating Flow-Induced Vibrations (FIV) in cylinders and cylinder arrangements elastically supported with two degrees of freedom and subjected to water flows of low Reynolds numbers. In this regard, aspects related to the construction of models on an ultra-reduced scale are presented, as well as the precise measurement technique of dynamics via the Motion Capture System (MCS), both solutions that allowed results at the desired low Reynolds numbers. In fact, the results are quite close to those obtained from experiments in large and expensive towing tanks, which validates the CWC at low Reynolds numbers as a promising infrastructure for the investigation of FSI, faster and cheaper, particularly in research campaigns with a large number of conditions to be selected already in the initial development phase, for example, when defining the best geometry for a Floating Offshore Wind Turbine (FOWT). Undoubtedly, it is important to make clear that in the offshore industry, there are no practical cases of FIV in Reynolds numbers as low as those studied in this work. However, it is common sense that the flow models responsible for the full-scale FIV phenomena are qualitatively preserved in low Reynolds numbers which therefore allows the use of investigations in these regimes for faster and cheaper selection of promising designs, in addition to contributing to a more comprehensive and robust validation of numerical approaches via CFD.
Keywords
Circulating Water Channel (CWC), Low Reynolds Numbers, reduced models, Motion Capture System (MCS), Fluid-Structure Interactions (FSI)
