Author/Authors :
Ma, C Department of Mechanical Engineering - College of Engineering - Ocean University of China - Qingdao 266100, PR China , Zhang, K Department of Mechanical Engineering - College of Engineering - Ocean University of China - Qingdao 266100, PR China , Zhang, B Department of Mechanical Engineering - College of Engineering - Ocean University of China - Qingdao 266100, PR China , Zhao, B Department of Mechanical Engineering - College of Engineering - Ocean University of China - Qingdao 266100, PR China , Wang, Q Department of Mechanical Engineering - College of Engineering - Ocean University of China - Qingdao 266100, PR China
Abstract :
The mucous membrane on the fish surface has excellent drag reduction performance. The mucous membrane can be regarded as the viscoelastic fluid, and a bionic friction drag reduction model is proposed with the consideration of a Carreau viscoelastic model-based mucus secretion process. Then, the drag reduction effect of the mucous membrane on the classical wall turbulence boundary layer is investigated by large-eddy simulations. Results show that the bionic mucous membrane is conducive to reducing the turbulence, and can achieve a drag reduction rate of about 14%. This study provides a hydrodynamics understanding of the drag reduction characteristics of the bionic mucous membrane.
Keywords :
Mucous membrane , Bionic drag reduction , Viscoelastic fluid , Turbulence statistics , Coherent structure
