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Modeling of a pitching and plunging airfoil using experimental flow field and load measurements

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Abstract

The main goal of the current paper is to outline a low-order modeling procedure of a heaving airfoil in a still fluid using experimental measurements. Due to its relative simplicity, the proposed procedure is applicable for the analysis of flow fields within complex and unsteady geometries and it is suitable for analyzing the data obtained by experimentation. Currently, this procedure is used to model and predict the flow field evolution using a small number of low profile load sensors and flow field measurements. A time delay neural network is used to estimate the flow field. The neural network estimates the amplitudes of the most energetic modes using four sensory inputs. The modes are calculated using proper orthogonal decomposition of the flow field data obtained experimentally by time-resolved, phase-locked particle imaging velocimetry. To permit the use of proper orthogonal decomposition, the measured flow field is mapped onto a stationary domain using volume preserving transformation. The analysis performed by the model showed good estimation quality within the parameter range used in the training procedure. However, the performance deteriorates for cases out of this range. This situation indicates that, to improve the robustness of the model, both the decomposition and the training data sets must be diverse in terms of input parameter space. In addition, the results suggest that the property of volume preservation of the mapping does not affect the model quality as long as the model is not based on the Galerkin approximation. Thus, it may be relaxed for cases with more complex geometry and kinematics.

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Acknowledgements

The authors would like to thank the Tel-Aviv University Renewable Energy Center for financial support of this project.

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  1. School of Mechanical Engineering, Faculty of Engineering, Tel-Aviv University, 69978, Tel-Aviv, Israel

    Victor Troshin & Avraham Seifert

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  1. Victor Troshin
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  2. Avraham Seifert
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Correspondence to Victor Troshin.

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Troshin, V., Seifert, A. Modeling of a pitching and plunging airfoil using experimental flow field and load measurements. Exp Fluids 59, 6 (2018). https://doi.org/10.1007/s00348-017-2462-3

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  • DOI: https://doi.org/10.1007/s00348-017-2462-3

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