Assessment of the derivative-moment transformation method for unsteady-load estimation

Date
2012
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Abstract
It is often difficult, if not impossible, to measure the aerodynamic or hydrodynamic forces on a moving body. For this reason, a traditional control-volume technique is typically apĀ­plied to extract the unsteady forces. However, measuring the acceleration term within the volume of interest can be limited by optical access, reflections as well as shadows. ThereĀ­fore in this study an alternative approach, termed the Derivative-Moment Transformation (DMT) method, is introduced and tested on a synthetic data set produced using numerical simulations. The test case involves the unsteady loading of a flat plate in a two-dimensional, laminar periodic gust. The results suggest that the DMT method can accurately predict the acceleration term so long as appropriate spatial and temporal resolutions are maintained. It was shown that for large control volumes, and with realistic spatial resolution, the accuracy of the DMT method would also suffer. Therefore, a delicate compromise is required when selecting control-volume size in future experiments.
Description
Bibliography: p. 60-63
Some pages are in colour.
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Citation
Mohebbian, A. (2012). Assessment of the derivative-moment transformation method for unsteady-load estimation (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/4904
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