A Modified Von Karman Model for Offshore Wind Field Generation

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Accurate modeling of three-dimensional turbulent flow field is necessary for dynamic analysis of wind turbines. In this study, a modified von Karman model is proposed for auto-correlations and auto-spectra as well as cross-correlations and cross-spectra for offshore wind generation. Measurement is carried out on an offshore meteorological mast for validation. Proposed model for auto-correlation and auto-spectra agree well with measurement data, while the original von Karman model underestimates auto-correlation and peak frequency in auto-spectra for lateral and vertical components. Proposed cross-correlation and cross-spectra also agree with measurements. The values of model parameters are proposed for ratios of standard deviation and normalized Reynolds stress based on measurement. Proposed values showed better agreement with measurement compared to the recommended values in IEC61400-1.

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