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Wind and Structures Volume 26, Number 5, May 2018 , pages 331-341 DOI: https://doi.org/10.12989/was.2018.26.5.331 |
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Couette-Poiseuille flow based non-linear flow over a square cylinder near plane wall |
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Rajesh Bhatt, Dilip K. Maiti, Md. Mahbub Alamand S. Rehman
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| Abstract | ||
| A numerical study on the flow over a square cylinder in the vicinity of a wall is conducted for different Couette-Poiseuille-based non-uniform flow with the non-dimensional pressure gradient P varying from 0 to 5. The non-dimensional gap ratio L (=H/a) is changed from 0.1 to 2, where H is gap height between the cylinder and wall, and a is the cylinder width. The governing equations are solved numerically through finite volume method based on SIMPLE algorithm on a staggered grid system. Both P and L have a substantial influence on the flow structure, time-mean drag coefficient , fluctuating (rms) lift coefficient (CL), and Strouhal number St. The changes in P and L leads to four distinct flow regimes (I, II, III and IV). Following the flow structure change, the , CL, and St all vary greatly with the change in L and/or P. The and CL both grow with increasing P and/or L. The St increases with P for a given L, being less sensitive to L for a smaller P (< 2) and more sensitive to L for a larger P (>2). A strong relationship is observed between the flow regimes and the values of , CL and St. An increase in P affects the pressure distribution more on the top surface than on bottom surface while an increase in L does the opposite. | ||
| Key Words | ||
| square cylinder; couette-poiseuille flow; aerodynamic characteristics; gap flow | ||
| Address | ||
| Rajesh Bhatt and Md. Mahbub Alam: nstitute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China Dilip K. Maiti: Department of Applied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Midnapur 721102, India S. Rehman: Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran-31261, Saudi Arabia | ||