Effect of boundary location on the steady flow past an impulsively started circular cylinder

2014 ◽  
Vol 5 (3) ◽  
pp. 252 ◽  
Author(s):  
Jiten C. Kalita
Keyword(s):  
Circular Cylinder ◽  
Steady Flow ◽  
Flow Past ◽  
Boundary Location

Oscillatory flow past a circular cylinder in a rotating frame

1997 ◽  
Vol 345 ◽  
pp. 101-131
Author(s):  
M. D. KUNKA ◽  
M. R. FOSTER
Keyword(s):  
Circular Cylinder ◽  
Steady Flow ◽  
Stagnation Point ◽  
Oscillatory Flow ◽  
Numerical Solutions ◽  
Initial Conditions ◽  
Temporal Integration ◽  
Oncoming Flow ◽  
Flow Past ◽  
Rear Stagnation Point

Because of the importance of oscillatory components in the oncoming flow at certain oceanic topographic features, we investigate the oscillatory flow past a circular cylinder in an homogeneous rotating fluid. When the oncoming flow is non-reversing, and for relatively low-frequency oscillations, the modifications to the equivalent steady flow arise principally in the ‘quarter layer’ on the surface of the cylinder. An incipient-separation criterion is found as a limitation on the magnitude of the Rossby number, as in the steady-flow case. We present exact solutions for a number of asymptotic cases, at both large frequency and small nonlinearity. We also report numerical solutions of the nonlinear quarter-layer equation for a range of parameters, obtained by a temporal integration. Near the rear stagnation point of the cylinder, we find a generalized velocity ‘plateau’ similar to that of the steady-flow problem, in which all harmonics of the free-stream oscillation may be present. Further, we determine that, for certain initial conditions, the boundary-layer flow develops a finite-time singularity in the neighbourhood of the rear stagnation point.

Steady flow past a circular cylinder under large blockage

2021 ◽  
Vol 87 ◽  
pp. 135-150
Author(s):  
Shravan Kumar Mishra ◽  
Subhankar Sen ◽  
Akhil Verma
Keyword(s):  
Circular Cylinder ◽  
Steady Flow ◽  
Flow Past

scholarly journals Errors and uncertainties in simulation of steady, viscous flow past a circular cylinder at Re = 20 using a systematic approach

2020 ◽  
Vol 12 (3) ◽  
pp. 203-217
Author(s):  
Aravind SEENI ◽  
Parvathy RAJENDRAN ◽  
Mamat HUSSIN ◽  
Farzad ISMAIL
Keyword(s):  
Circular Cylinder ◽  
Domain Boundary ◽  
Independent Solution ◽  
Ansys Fluent ◽  
Flow Past ◽  
Interesting Pattern ◽  
Acceptable Quality ◽  
Mesh Resolution ◽  
Structured Meshes ◽  
Boundary Location

The use of Computational Fluid Dynamics as a tool for design and analysis of aerospace systems is well established. Since the results generated by a CFD solver are numerical approximations, the solution is inherently produced with errors and uncertainties. In this paper, a simple fluid flow problem of laminar, incompressible flow past a circular cylinder at Reynolds number of 20 is allowed to be solved by the well-known finite-volume solver ANSYS Fluent. The effect of variations in mesh resolution, domain boundary location and residual criteria settings is investigated. For all the cases, finite, structured meshes of acceptable quality are used. The influence of variables on the cylinder’s drag results is analyzed and discussed. An interesting pattern in results has been observed. The study on the variation in mesh resolution showed no presence of mesh independent solution. The study on the variation of the domain distance showed that it is necessary to increase the diameter of the circle several thousand times to obtain a domain independent solution.

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