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The turbulence drag reduction properties of spanwise forcing in the form of spanwise-traveling wave are studied via two types of implementations: wall motion and body force. Studies have been performed in a 3D/4D parametric space respectively. The control parameters yielding the best drag reduction and energetic performance are identified in the parametric space. Different flow statistics suggest that the turbulence structure is significantly altered by such control strategies. Considering the energy budget shows
that such forcing is rather ineffective, and that the spatial non-uniformity of the forcing is always detrimental with respect to the net savings.
Author(s):
Wenxuan Xie
Department of Aerospace Science and Technology, Politecnico di Milano
Italy
Maurizio Quadrio
Department of Aerospace Science and Technology, Politecnico di Milano
Italy