2-D computational analyses were conducted for unsteady viscous flow across cylinders of different geometries and different incident angle. Circular, square and elliptic (both at 0° and 90° angles of incidence) cylinders were examined. The calculations were performed by solving the unsteady 2-D Navier-Stokes equation at Re = 100. The calculated results produce drag and lift coefficients, as well as Strouhal number in excellent agreement with published data. Calculations for unsteady, incompressible 2D flow around a square cylinder at incidence angle of 0° and 45° and for Reynolds number = 100 were carried out. Cycle independence and grid independence results were obtained for the Strouhal number. The results were in excellent agreement with the available experimental and numerical results. Numerical results show that the Strouhal number increases with fluid angle of incidence on the cylinder. The wake behind the cylinder is wider and more violent for a square cylinder at 45° incidence compared to a square at 0° this is due to the increase in the characteristic length in the flow direction. The Strouhal number is highest for elliptic geometry among all cylinders in this research. For the geometries elliptic at 0° at Re = 100, there is not vortex shedding behind the cylinder. This is due to dominance of inertia forces over viscous forces. The present study was carried out for a 2-D single cylinder at fixed location inside a channel for unidirectional velocity. To get more accurate results computation on 3-D geometry should be carried out.
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ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
June 6–11, 2010
Shanghai, China
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4913-2
PROCEEDINGS PAPER
Unsteady Numerical Analysis of Flow Across 2D Cylinder
Yaling Peng,
Yaling Peng
China Ship Development and Design Center, Wuhan, Hubei, China
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Zhiguo Zhang,
Zhiguo Zhang
Huazhong University of Science and Technology, Wuhan, Hubei, China
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Fangliang Wu,
Fangliang Wu
China Ship Development and Design Center, Wuhan, Hubei, China
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Dakui Feng
Dakui Feng
Huazhong University of Science and Technology, Wuhan, Hubei, China
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Yaling Peng
China Ship Development and Design Center, Wuhan, Hubei, China
Zhiguo Zhang
Huazhong University of Science and Technology, Wuhan, Hubei, China
Fangliang Wu
China Ship Development and Design Center, Wuhan, Hubei, China
Dakui Feng
Huazhong University of Science and Technology, Wuhan, Hubei, China
Paper No:
OMAE2010-20884, pp. 857-863; 7 pages
Published Online:
December 22, 2010
Citation
Peng, Y, Zhang, Z, Wu, F, & Feng, D. "Unsteady Numerical Analysis of Flow Across 2D Cylinder." Proceedings of the ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts A and B. Shanghai, China. June 6–11, 2010. pp. 857-863. ASME. https://doi.org/10.1115/OMAE2010-20884
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