We present Direct Numerical Simulation (DNS) of low-speed flow past a full stationary wind-turbine blade (without twist). This work is motivated to produce a DNS database for verification of solvers and turbulent models utilized in wind-turbine modeling community. DNS computations are carried out for a Reynolds numbers of Re = 10, 000 with blade aligned along the free stream direction (zero angle of attack). Composite overlapping grid approach is utilized to perform the DNS. Three different shedding regimes along the blade length are observed. The first regime comprises of a von-Kármán type shedding in cylinder shaft region, followed by a near body shear layer break down along the airfoil section of the blade. The blade tip region is characterized by a long tip vortex, which exits the computational plane without being significant perturbed. Flow transition from laminar to turbulent flow is observed along the blade length with increasing turbulent fluctuations as one traverses the blade from the base to the blade tip, where the flow remains laminar. Strouhal numbers is found to decrease monotonously along the blade length and achieves a zero value at the blade tip. Average lift and drag coefficients for the whole turbine blade are also reported for the case investigated.
|Title of host publication
|19th Australasian Fluid Mechanics Conference, AFMC 2014
|Australasian Fluid Mechanics Society
|Published - Jan 1 2014
Bibliographical noteKAUST Repository Item: Exported on 2020-12-25
Acknowledged KAUST grant number(s): CRG
Acknowledgements: The work is supported by KAUST OCRF funded CRG project tiled ”Numerical simulation of complex turbulent flows over
wind turbines and bluff bodies”. Authors would also like to thank Prof. William D. Henshaw at Rensselaer Polytechnic Institute, USA, for fruitful discussions, guidance and support in effective execution of the overlapping grid solver at various stages of the project.