Two-scale dynamics of flow past a partial cross-stream array of tidal turbines

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dc.contributor.authorNishino, Takafumi
dc.contributor.authorWillden, R. H. J.
dc.date.accessioned2016-08-26T13:31:23Z
dc.date.available2016-08-26T13:31:23Z
dc.date.issued2016-07-30
dc.description.abstractThe characteristics of flow past a partial cross-stream array of (idealized) tidal turbines are investigated both analytically and computationally to understand the mechanisms that determine the limiting performance of partial tidal fences. A two-scale analytical partial tidal fence model reported earlier is further extended by better accounting for the effect of array-scale flow expansion on device-scale dynamics, so that the new model is applicable to short fences (consisting of a small number of devices) as well as to long fences. The new model explains theoretically general trends of the limiting performance of partial tidal fences. The new model is then compared to three-dimensional Reynolds-averaged Navier–Stokes (RANS) computations of flow past an array of various numbers (up to 40) of actuator disks. On the whole, the analytical model agrees well with the RANS computations, suggesting that the two-scale dynamics described in the analytical model predominantly determines the fence performance in the RANS computations as well. The comparison also suggests that the limiting performance of short partial fences depends on how much of device far-wake mixing takes place within the array near-wake region. This factor, however, depends on the structures of the wake and therefore on the type/design of devices to be arrayed.en_UK
dc.identifier.citationNishino, T., Willden, R. H. J. (2016) Two-scale dynamics of flow past a partial cross-stream array of tidal turbines, Vol. 730, pp. 220-244en_UK
dc.identifier.issn0022-1120
dc.identifier.urihttp://dx.doi.org/10.1017/jfm.2013.340
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/10457
dc.language.isoenen_UK
dc.publisherCambridge University Pressen_UK
dc.rightsAttribution-Non-Commercial-No Derivatives 3.0 Unported (CC BY-NC-ND 3.0). You are free to: Share — copy and redistribute the material in any medium or format. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: Non-Commercial — You may not use the material for commercial purposes. No Derivatives — If you remix, transform, or build upon the material, you may not distribute the modified material. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.en_UK
dc.subjectChannel flowen_UK
dc.subjectCoastal engineeringen_UK
dc.subjectShallow water flowsen_UK
dc.titleTwo-scale dynamics of flow past a partial cross-stream array of tidal turbinesen_UK
dc.typeArticleen_UK

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