Steady laminar forced convection from a circular cylinder

Jafroudi, Hamid; Yang, H. T.

doi:10.1016/0021-9991(86)90003-3

Cited by 26 publications

(3 citation statements)

References 9 publications

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“…The current work utilizes an inviscid "characteristic" formulation for the upper inflow/outflow boundary; an improvement to this boundary condition which would overcome the limitation of using a finite computational domain has been suggested by Jafroudi and Yang [56]. They recommended obtaining the asymptotic solution for the compressible, turbulent Navier-Stokes equations at large distances from the finite body.…”

Section: Discussionmentioning

confidence: 99%

Supersonic, turbulent flow computation and drag optimization for axisymmetric afterbodies

Cummings

Yang

1995

Computers & Fluids

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Abstract-The compressible, turbulent flow about an axisymmetric body was numerically studied using the MacCormack unsplit explicit algorithm applied to the mass-average Navier--Stokes equations solved in conjunction with the k+ turbulence model of Jones and Launder. Numerical predictions of total body drag (pressure drag, skin friction drag, and base drag) were made for an axisymmetric body six diameters in length, with and without a boattail. Surface pressures and viscous layer profiles are compared with available wind tunnel data and are found to be in good agreement for both geometries. The Golden Section optimization method was used to optimize the body boattail angle for minimum drag. The solution method can serve as a tool for preliminary design analysis where the relative merits of utilizing boattails on axisymmetric afterbodies is being considered.

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Section: Discussionmentioning

confidence: 99%

Supersonic, turbulent flow computation and drag optimization for axisymmetric afterbodies

Cummings

Yang

1995

Computers & Fluids

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“…For the , the percent errors estimated from the literature results (Tritton 1959; Takami & Keller 1969; Dennis & Chang 1970) range from 0 to 3.1 %, 1 % to 4.2 %, 1.1 % to 2.2 % and 0.6 % to 5 % for and , respectively. For the , the percent errors computed from the previous results (Dennis, Hudson & Smith 1968; Jafroudi & Yang 1986; Bharti, Chhabra & Eswaran 2007; Biswas & Sarkar 2009) differ from 1 % to 3.1 %, 0.4 % to 4.6 %, 0 to 1.4 % and 0 to 6.6 % for and , respectively. Therefore, the current numerical scheme is considered valid and the grid resolution around each circular cylinder is sufficiently fine for the rest of the computations.…”

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confidence: 78%

Opposing-buoyancy mixed convection through and around arrays of heated cylinders

Tang

et al. 2022

J. Fluid Mech.

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We numerically investigated the opposing-buoyancy mixed convection through and around square arrays of $10\times 10$ heated circular cylinders with the solid fraction ( $\phi$ ) ranging from 0.0079 to 0.66 and the Richardson number ( $Ri$ ) varying from 0 to 1 at a fixed Reynolds number ( $Re$ ) of 100. Our simulations revealed that the large mean recirculation in the far wake can be detached from or connected with the vortex pair in the near wake for different combinations of $Ri$ and $\phi$ . Also, it was found that the array with relatively small $\phi$ can significantly promote flow instability even at moderate $Ri$ . The instability, which is closely related to the fluctuating heat flux, develops from the lateral sides to the downstream side of the array and gives rise to the large mean recirculation in the far wake. The power spectra density of the array-scale force coefficients demonstrates that the flow undergoes different bifurcation behaviours under various parameter combinations, which reflects the interaction between the near-wake and far-wake vortexes. Interestingly, the Strouhal–Richardson number curves can be collapsed onto the same curve when $Ri$ is increased by a $\phi$ -dependent factor. Also, for $\phi \leqslant 0.22$ , both the mean drag coefficient and the mean Nusselt number of the array were found to decrease linearly with $Ri$ since the buoyancy within the array becomes prominent in this range of $\phi$ .

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“…The average convective heat transfer coefficients (h q ) are computed as h ave ¼ 2.76, 3.38 and 4.43 W/m 2 K for the blockage ratio cases of b ¼ 0.333, 0.571 and 0.800, where the corresponding average Nusselt numbers are Nu ave ¼ 4.05, 4.97 and 6.51. Biswas and Sarkar [37], Dennis et al [43], Jafroudi and Yang [44] and Apelt and Ledwich [45] considered flows around circular cylinders without blockage for the specific case of Re ¼ 40 and evaluated average Nusselt numbers in the narrow band of Nu ave ¼ 3.20e3.48. On the other hand, Bharti et al [12], Buyruk et al [15], Khan et al [16] and Dhiman et al [17] also reported raised heat transfer values with blockage.…”

Section: Computational Analysis In the Air Flow Domainmentioning

confidence: 99%

Hydrodynamic-thermal boundary layer development and mass transfer characteristics of a circular cylinder in confined flow

Ozalp

Dinçer

2010

International Journal of Thermal Sciences

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Steady laminar forced convection from a circular cylinder

Cited by 26 publications

References 9 publications

Supersonic, turbulent flow computation and drag optimization for axisymmetric afterbodies

Supersonic, turbulent flow computation and drag optimization for axisymmetric afterbodies

Opposing-buoyancy mixed convection through and around arrays of heated cylinders

Hydrodynamic-thermal boundary layer development and mass transfer characteristics of a circular cylinder in confined flow

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