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SUMMARYFlows over two tandem cylinders were analysed using the newly developed collocated unstructured computational uid dynamics (CUCFD) code, which is capable of handling complex geometries. A Reynolds number of 100, based on cylinder diameter, was used to ensure that the ow remained laminar. The validity of the code was tested through comparisons with benchmark solutions for ow in a lid-friven cavity and ow around a single cylinder. For the tandem cylinder ow, also mesh convergence was demonstrated, to within a couple of percent for the RMS lift coe cient.The mean and uctuating lift and drag coe cients were recorded for centre-to-centre cylinder spacings between 2 and 10 diameters. A critical cylinder spacing was found between 3.75 and 4 diameters. The uctuating forces jumped appreciably at the critical spacing. It was found that there exists only one reattachment and one separation point on the downstream cylinder for spacings greater than the critical spacing.The mean and the uctuating surface pressure distributions were compared as a function of the cylinder spacing. The mean and the uctuating pressures were signiÿcantly di erent between the upstream and the downstream cylinders. These pressures also di ered with the cylinder spacing.

Short-term forecasting and uncertainty analysis of wind turbine power based on long short-term memory network and Gaussian mixture model. Applied Energy,

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