Numerical Analysis of Fluid Flow around a Circular Cylinder at Low Reynolds Number (original) (raw)
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Analysis of vortex formation around a circular cylinder at low Reynolds number
Vortex shedding is one of the most interesting phenomenon in turbulent flow. This phenomenon was first studied by Strouhal. In this paper, the analysis of vortex shedding around a 2 dimensional circular cylinder with Reynolds No of 200, 500, and 1000 with different angle of attack 0 , 5 , and 10 has been studied. In this simulation an implicit pressure-based finite volume method and second order implicit scheme is used. Flow has been studied with the help of Navier-Stokes and continuity equations. The pressure, drag coefficients and vortex shedding for different Reynolds numbers and different angle of attack were computed and compared with other numerical result that show good agreement.
IJREI- Analysis of Vortex Formation around a Circular Cylinder at low Reynolds Number
Vortex shedding is one of the most interesting phenomenon in turbulent flow. This phenomenon was first studied by Strouhal. In this paper, the analysis of vortex shedding around a 2 dimensional circular cylinder with Reynolds No of 200, 500, and 1000 with different angle of attack 0 0 , 5 0 , and 10 0 has been studied. In this simulation an implicit pressure-based finite volume method and second order implicit scheme is used. Flow has been studied with the help of Navier-Stokes and continuity equations. The pressure, drag coefficients and vortex shedding for different Reynolds numbers and different angle of attack were computed and compared with other numerical result that show good agreement.
Numerical Investigation of the Fluid Flow around and Past a Circular Cylinder by Ansys Simulation
Flow around a circular cylinder is a fundamental fluid mechanics problem of practical importance. The dynamic characteristics of the pressure and velocity fields of unsteady incompressible laminar and turbulent wakes behind a circular cylinder are investigated numerically and analyzed simulation. The governing equations, written in the velocity pressure formulation are solved using 2-D finite volume method. In the present work is based on the cylinder diameter 10 2 Reynolds number for flow analysis slow and also turbulent based on the diameter of the cylindrical Reynolds number 10 5 as well as for the analysis of the flow around a cylindrical has been considered. The aim of this research is to investigate the influence of Reynolds number on flow parameters and verify the correctness of the calculations carried out by the governing equations of fluid mechanics-flow. Research on the hydraulic parameters of the flow around a cylinder help of ANSYS software. The frequencies of the drag and lift oscillations obtained theoretically agree well with the experimental results. The pressure and drag coefficients for different Reynolds numbers were also computed and compared with experimental and other numerical results. Due to faster convergence, 2-D finite volume method is found very much prospective for turbulent flow as well as laminar flow.
Numerical investigation of unsteady flow past a circular cylinder using 2-D finite volume method
2007
Abstract The dynamic characteristics of the pressure and velocity fields of unsteady incompressible laminar and turbulent wakes behind a circular cylinder are investigated numerically and analyzed physically. The governing equations, written in the velocity pressure formulation are solved using 2-D finite volume method. The initial mechanism for vortex shedding is demonstrated and unsteady body forces are evaluated.
Numerical simulation of laminar flow past a circular cylinder
Applied Mathematical Modelling, 2009
The present paper focuses on the analysis of two-and three-dimensional flow past a circular cylinder in different laminar flow regimes. In this simulation, an implicit pressure-based finite volume method is used for time-accurate computation of incompressible flow using second order accurate convective flux discretisation schemes. The computation results are validated against measurement data for mean surface pressure, skin friction coefficients, the size and strength of the recirculating wake for the steady flow regime and also for the Strouhal frequency of vortex shedding and the mean and RMS amplitude of the fluctuating aerodynamic coefficients for the unsteady periodic flow regime. The complex three dimensional flow structure of the cylinder wake is also reasonably captured by the present prediction procedure.
Journal of Mathematics
In this study, we intend to investigate the steady-state and laminar flow of a viscous fluid through a circular cylinder fixed between two parallel plates keeping the aspect ratio of 1 : 5 from cylinder radius to height of the channel. The two-dimensional, incompressible fluid flow problem has been simulated using COMSOL Multiphysics 5.4 which implements finite element’s procedure. The flow pattern will be investigated by using the Reynolds number from 100 to 1000. The reattachment length formed at the back of the cylinder and drag force when the fluid comes to strike with the front surface of the cylinder is expressed in terms of Reynolds numbers. We propose to calculate the velocity and the pressure before and after the cylinder. For this purpose, two-line graphs before and after the cylinder will be drawn to check the impact of cylinder on both velocity and pressure. It was found that the percentage change in the velocity as well as pressure before to after the cylinder is changi...
Journal of Fluids and Structures, 2013
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Numerical Simulation of Velocity and Pressure Field Around a Cylinder at Moderate Reynolds Number
INTERNATIONAL JOURNAL OF ADVANCED RESEARCH IN ENGINEERING & TECHNOLOGY, 2019
Many offshore structures contain cylindrical elements, such as cladding platforms, jackets, tension-leg platforms and marine pipelines. However, exposure to current and waves can cause oil leakage. Conducts at intermediate water depths are subject to currents plus waves causing large variations in velocities and hence the Reynolds number (Re = UcD / υ, where Uc is the free flow velocity, D is the diameter of the cylinder and υ is the kinematic viscosity of the fluid) most often appears in the range from 10 ^ 3 to 10 ^ 7. It is therefore important to understand the flow around the circular cylinder in the effective Re range. In recent years there is a strong use of computational fluid dynamics (CFD) which is a branch of fluid mechanics that uses numerical analysis and data structures to solve and analyze problems involving fluid flow and also interaction between waves and structures. The main use of CFD is to solve the Navier-Stokes equations and their equations. There are therefore several methods to solve the Navier-Stokes equations, and since they are generally high-cost computational operations, more sophisticated model-based approaches have been developed:-Direct numerical simulation
Volume 4: Fluid-Structure Interaction, 2007
The numerical simulation of the flow past a circular cylinder forced to oscillate transversely to the incident stream is presented here for a fixed Reynolds number equal to 100. The 2D Navier-Stokes equations are solved with a classical Finite Volume Method with an industrial CFD code which has been coupled with a user subroutine to obtain an explicit staggered procedure providing the cylinder displacement. A preliminary work is conducted in order to check the computation of the wake characteristics for Reynolds numbers smaller than 150. The Strouhal frequency f S , the lift and drag coefficients C L and C D are thus controlled among other parameters. The simulations are then performed with forced oscillations f 0 for different frequency ratios F=f 0 /f S in [0.50-1.50] and an amplitude A varying between 0.25 and 1.25. The wake characteristics are analysed using the time series of the fluctuating aerodynamic coefficients and their FFT. The frequency content is then linked to the shape of the phase portrait and to the vortex shedding mode. By choosing interesting couples (A,F), different vortex shedding modes have been observed, which are similar to those of the Williamson-Roshko map.
International Journal of Computing Science and Applied Mathematics, 2020
Numerical experiments and simulations of fluid flow through the outer surface of a circular cylinder and three passive controls have been investigated to determine the proper configuration of three passive controls in reducing the drag coefficient. One of passive controls is placed in front of the cylinder with distance ratio (S/D) = 2.4 and the other two passive controls are placed behind the cylinder with distance ratio (T /D) = 1.6, 1.8. The angle between two passive controls behind the cylinder are α = 30 • , 60 • , 90 • , 120 •. The Navier-Stokes equations for incompressible, viscous and unsteady fluid flows is solved based on SIMPLE (Semi-Implicit for Pressure-Linked Equations) algorithms and discretized using finite-difference method. The difference in α affects the reduction in the drag coefficient significantly. The best configuration of three passive controls design is one of passive controls put at the distance ratio S/D = 2.4, T /D = 1.6 and α = 60 •. This configuration can reduce the drag coefficient optimally to 21.2109%.