TY  - EJOU
AU  - Wang, Yin 
AU  - Wang, Lingling 
AU  - Ji, Yong 
AU  - Xi, Zhicheng 
AU  - Zhang, Wenwen 

TI  - A Numerical Study on the Mechanisms Producing Forces on Cylinders Interacting with Stratified Shear Environments
T2  - Fluid Dynamics \& Materials Processing

PY  - 2021
VL  - 17
IS  - 2
SN  - 1555-2578

AB  - A three dimensional (3D) numerical wave flume is used to investigate carefully the ISWs (Internal solitary wave) forces acting on cylinders interacting with a stratified shear environment. Using the Large-Eddy Simulation (LES) approach and analyzing the distribution of shear stress and pressure along the surface of the cylinder, the differential pressure resistance and the viscous force are obtained. The method of multiple linear regression analysis is adopted and a comprehensive influence coefficient is determined accordingly to account for the dimensionless forces acting on the cylinder. Results show that the differential pressure resistance on a square cylinder is 1.5 times higher than that on a circular cylinder in the upper layer, while the differential pressure resistance on a square cylinder is 3.5 times larger than that on a circular cylinder in the lower layer. The viscous force is 1–2 orders of magnitude smaller than the differential pressure resistance, which means that the viscous force could be ignored. The comprehensive influence coefficient shows positive correlation with the relative wave height and negative correlation with upper and lower water depth ratio.
KW  - Internal solitary waves; cylinders; force behaviors; mechanism study; numerical simulation

DO  - 10.32604/fdmp.2021.014652