scholarly journals A numerical study on effect of corner radius and Reynolds number on fluid flow over a square cylinder

Sadhana ◽  
2017 ◽  
Vol 42 (7) ◽  
pp. 1155-1165 ◽  
Author(s):  
Prasenjit Dey ◽  
Ajoy K R Das
Keyword(s):  
Reynolds Number ◽  
Fluid Flow ◽  
Numerical Study ◽  
Square Cylinder ◽  
Corner Radius

Numerical study on the fluid flow pass a square cylinder: The temperature-viscosity dependence

2014 ◽  
Vol 25 (03) ◽  
pp. 1350101
Author(s):  
Jianhua Lu ◽  
Sheng Li ◽  
Zhaoli Guo ◽  
Baochang Shi
Keyword(s):  
Fluid Flow ◽  
Free Stream ◽  
Numerical Study ◽  
Effect Of Temperature ◽  
Square Cylinder ◽  
Efficient Tool ◽  
Multiple Relaxation Time ◽  
Upward Velocity ◽  
Drag And Lift ◽  
Viscosity Dependence

In this paper, the 2D fluid flow pass a heated/cooled square cylinder exposed to a constant free-stream upward velocity is simulated via a multiple relaxation time (MRT) lattice-Boltzmann (LB) method. The buoyancy effect on the drag and lift coefficients as well as Nusselt number related is compared with the results in the existing literatures to validate the code used. The effect of temperature-viscosity dependence is then investigated to test whether the effect can be neglected or not for the mixed convection case. It is shown that the effect cannot be ignored when |Ri| > 0.15. Fortunately, the effect can be captured by using an effective temperature formula [J. M. Shi, D. Ferlach, M. Breuer, G. Biswas and F. Durst, Phys. Fluids16, 4331 (2004)] in a rather large range of Ri. All the numerical results, from another angle, also demonstrate that the MRT method is an efficient tool in simulating the problems such as the present one.

The Effect of Blockage Ratio on Fluid Flow and Heat Transfer around a Confined Square Cylinder under the Effect Thermal Buoyancy

2018 ◽  
Vol 16 ◽  
pp. 1-11
Author(s):  
Houssem Laidoudi
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Blockage Ratio ◽  
Square Cylinder ◽  
Total Drag ◽  
Thermal Buoyancy ◽  
2D Simulation ◽  
Flow And Heat Transfer

2D simulation is carried out to determine exactly the effect of blockage ratio on the flow and mixed convection heat transfer characteristics of Newtonian fluid across a square cylinder confined in horizontal channel, the numerical study is investigated in the range of these conditions:Re= 10 to 30,Ri= 0 to 1 and blockage ratioβ= 1/10 to 1/2. The flow structure and temperature field are visualized in terms of streamlines and isotherm contours. The total drag coefficient and average Nusselt number are also reported to show the combined effects of thermal buoyancy, Reynolds number and blockage ratio on the hydrodynamic flow forces and heat transfer rate. The obtained results showed that the effect of thermal buoyancy on fluid flow and heat transfer becomes more pronounced by decreasing the blockage ratio.

A Numerical Study of Flow and Heat Transfer in a Smooth and Ribbed U-Duct With and Without Rotation

2000 ◽  
Vol 123 (2) ◽  
pp. 219-232 ◽  
Author(s):  
Y.-L. Lin ◽  
T. I.-P. Shih ◽  
M. A. Stephens ◽  
M. K. Chyu
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Fluid Flow ◽  
Mach Number ◽  
Vector Fields ◽  
Numerical Study ◽  
Density Ratio ◽  
Three Dimensional ◽  
Secondary Flows ◽  
Flow And Heat Transfer

Computations were performed to study the three-dimensional flow and heat transfer in a U-shaped duct of square cross section under rotating and non-rotating conditions. The parameters investigated were two rotation numbers (0, 0.24) and smooth versus ribbed walls at a Reynolds number of 25,000, a density ratio of 0.13, and an inlet Mach number of 0.05. Results are presented for streamlines, velocity vector fields, and contours of Mach number, pressure, temperature, and Nusselt numbers. These results show how fluid flow in a U-duct evolves from a unidirectional one to one with convoluted secondary flows because of Coriolis force, centrifugal buoyancy, staggered inclined ribs, and a 180 deg bend. These results also show how the nature of the fluid flow affects surface heat transfer. The computations are based on the ensemble-averaged conservation equations of mass, momentum (compressible Navier-Stokes), and energy closed by the low Reynolds number SST turbulence model. Solutions were generated by a cell-centered finite-volume method that uses second-order flux-difference splitting and a diagonalized alternating-direction implicit scheme with local time stepping and V-cycle multigrid.

Vortex Shedding From a Square Cylinder With Ground Effect

2003 ◽  
Author(s):  
S. Bhattacharyya ◽  
D. K. Maiti
Keyword(s):  
Reynolds Number ◽  
Vortex Shedding ◽  
Stokes Equations ◽  
Numerical Study ◽  
Ground Effect ◽  
Staggered Grid ◽  
Navier Stokes ◽  
Square Cylinder ◽  
Navier Stokes Equations ◽  
Cylinder Length

Numerical study on the wake behind a square cylinder placed parallel to a wall has been made. Flow has been investigated in the laminar Reynolds number (based on the cylinder length) range. We have studied the flow field for different values of the non-dimensional gap length between cylinder and the wall. The case when the cylinder is placed on the wall has also been considered. The governing unsteady Navier-Stokes equations are discretised through the finite volume method on staggered grid system. A SIMPLER type of algorithm has been used to compute the discretised equations iteratively. Vortex shedding has been found to be influenced by the wall. Vortex shedding suppression occurs beyond a critical value of the gap length. Due to the shear, the drag experienced by the cylinder is found to increase with the reduction of gap length. The flow is found to be steady when the cylinder is placed on the wall at a range of Reynolds number.

Thermal Fluid Flow Transport Phenomena in a Channel Containing Slot-Perforated Flat Plates

2007 ◽  
Author(s):  
Shuichi Torii ◽  
Wen Jei Yang
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Fluid Flow ◽  
Heat Transfer Performance ◽  
Numerical Study ◽  
Plate Thickness ◽  
Transfer Performance ◽  
Flat Plates ◽  
Lower Region ◽  
Blockage Factor

A numerical study is performed to investigate unsteady, two-dimensional, incompressible laminar flow over both sides of a slot-perforated flat surface in a pulsating channel flow. Enhances is placed on the effects of the pulsating Strouhal number, the Reynolds number Re, the blockage factor, i.e., the ratio of plate thickness, d, to channel width, W, on the heat transfer performance and the velocity and thermal fields. It is found from the study that: (i) when the fluid stream is pulsated, the alternating change in the fluid flow disturbs the thermal boundary layer formed along the plate and induces mixing of the upper and lower streams of the plate downstream from the slot, resulting in an amplification of heat-transfer performance; (ii) heat transfer performance at the rear plate is induced with Re; (iii) by contrast, heat transfer performance is attenuated with an increase in the blockage factor, whose effect becomes larger in the lower region of the Reynolds number; and (iv) heat transfer performance is intensified with an increase in fSr, whose effect becomes minor in the lower region of the Reynolds number.

scholarly journals A numerical study on convection around a square cylinder using Al2O3-H2O nanofluid

2014 ◽  
Vol 18 (4) ◽  
pp. 1305-1314 ◽  
Author(s):  
Mohammad Valipour ◽  
Reza Masoodi ◽  
Saman Rashidi ◽  
Masoud Bovand ◽  
Mojtaba Mirhosseini
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Volume Fraction ◽  
Numerical Study ◽  
Pressure Coefficient ◽  
Simple Algorithm ◽  
Square Cylinder ◽  
Flow And Heat Transfer ◽  
Recirculation Length ◽  
Energy Equations

In this paper, a numerical simulation has been performed to study the fluid flow and heat transfer around a square cylinder utilizing Al2O3-H2O nanofluid over low Reynolds numbers. Here, both Reynolds and Peclet numbers are varied within the range of 1 to 40and the volume fraction of nanoparticles (?) is varied within the range of 0<?<0.05. Two-dimensional and steady mass continuity, momentum and energy equations have been discretized using Finite Volume Method (FVM). SIMPLE algorithm has been applied for solving the pressure linked equations. The effect of volume fraction of nanoparticles on fluid flow and heat transfer were investigated numerically. It was found that at a given Reynolds number, the Nusselt number, drag coefficient, recirculation length, and pressure coefficient increases by increasing the volume fraction of nanoparticles.

Numerical Study of Laminar Fluid Flow Around Two Cubes of Arbitrary Configuration Mounted on a Surface

2008 ◽  
Author(s):  
Mohammad Eslami ◽  
Mohammad Mehdi Tavakol ◽  
Ebrahim Goshtasbi Rad
Keyword(s):  
Reynolds Number ◽  
Fluid Flow ◽  
Flow Field ◽  
Numerical Study ◽  
Three Dimensional ◽  
Simple Algorithm ◽  
Bluff Bodies ◽  
Laminar Fluid Flow ◽  
Pressure Distributions ◽  
Arbitrary Configuration

The problem of flow field around single or multiple bluff bodies mounted on a surface is of great importance in different fields of engineering. The case of a single surface mounted cube has been studied extensively but unfortunately, little attention has been paid to the flow around two or more rectangular blocks in array. Therefore, A CFD code is developed to calculate three dimensional steady state laminar fluid flow around two cuboids of arbitrary size and configuration mounted on a surface in free stream conditions. The employed numerical scheme is finite volume and SIMPLE algorithm is used to treat pressure and velocity coupling. Results are presented for two cubes of the same size mounted on a surface for various inline and staggered arrangements. Streamlines at different planes are plotted for various combinations of the distance between the two cubes and Reynolds number. Velocity and pressure distributions are also plotted in the wake region behind the cubes. It is shown that presence of the second cube completely changes the flow field and vortical structures in comparison with the case of a single cube. Effects of the both stream-wise and spanwise distances between the two cubes and Reynolds number are also discussed.

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