Numerical simulation of the effects of diaphragm length on potential flow around a circular cylinder with rear diaphragm

Numerical simulation of the effects of diaphragm length on potential flow around a circular cylinder with rear diaphragm

Bofeng FanQingxiang Shui Yuling Yang 

School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China

School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710054, China

Corresponding Author Email: 
fbfyfbf@163.com
Page: 
672-676
|
DOI: 
https://doi.org/10.18280/ijht.360232
Received: 
1 October 2017
|
Accepted: 
22 February 2018
|
Published: 
30 June 2018
| Citation

OPEN ACCESS

Abstract: 

To disclose the flow field features around a circular cylinder with rear diaphragm, this paper numerically simulates the effects of diaphragm length on the potential flow around such a circular cylinder, using the characteristic-based operator splitting (CBOP) method based on multi-step format (MSF). Through the simulation, the author obtained the flow field velocities, mean drag coefficient, lift coefficient and Strouhal number, and analysed the variation laws of the flow field features. The research shows that the addition of the rear transverse diaphragm can effectively suppress the vortex shedding in the wake region, reduce the pressure difference between the upper and lower surfaces of the circular cylinder, and greatly improve the flow around the circular cylinder. When the diagram length was sufficiently long, the vorticity of the upper and lower shear layers was completely dissipated during the backward movement along the transverse diaphragm, eliminating the occurrence of vortex shedding. The simulated laws of the flow velocities and flow field eigenvalues were consistent with the results of the previous studies. The research findings provide a valuable reference for similar studies in future.

Keywords: 

finite-element analysis, rear diaphragm, potential flow around a circular cylinder, multi-step format (MSF), characteristic-based operator splitting (CBOP)

1. Introduction
2. Calculation Model
3. Numerical Model
4. Simulation Results and Analysis
5. Conclusions
  References

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