Numerical Study of the Flow Behavior in the Uniform Velocity Entry Flow Problem

Darbandi, Masoud; Schneider, G. E.

doi:10.1080/10407789808913999

Cited by 18 publications

(23 citation statements)

References 25 publications

(38 reference statements)

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“…Therefore, one does not need calculating the developing region if one is interested in obtaining solution only for the fully developed region. This eliminates the difficulties encountered at the inlet of channels [45,46]. This tactic also helps to diminish the computational cost and time considerably.…”

Section: Turbulent Flow In a Square Ductmentioning

confidence: 92%

“…This tactic also helps to diminish the computational cost and time considerably. It is because the number of grid points can be drastically reduced if the developing zone is eliminated from the computational domain [45][46][47]. It should be noted that the initial values for k and e are very important in modeling the periodic boundary conditions.…”

Section: Turbulent Flow In a Square Ductmentioning

confidence: 99%

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Three-dimensional compressible–incompressible turbulent flow simulation using a pressure-based algorithm

2008

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Section: Turbulent Flow In a Square Ductmentioning

confidence: 92%

Section: Turbulent Flow In a Square Ductmentioning

confidence: 99%

Three-dimensional compressible–incompressible turbulent flow simulation using a pressure-based algorithm

2008

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“…Darbandi and Schneider [9] investigate the entry problem and report several important conclusions. Firstly, the longest overshoot zone belongs to Re = 20.…”

Section: The Entrance Flow Problemmentioning

confidence: 99%

“…These velocity overshoots are found at all Reynolds numbers but their magnitudes are reduced with increasing Reynolds number [9]. There have been numerous e orts using numerical, analytical, and experimental methods to study those overshoots, see the literature review presented in Reference [9].…”

Section: Introductionmentioning

confidence: 97%

“…There have been numerous e orts using numerical, analytical, and experimental methods to study those overshoots, see the literature review presented in Reference [9]. The overshoots have been reported in the entrance region of many di erent ow geometries including parallel plates, pipes, annuli and semi-circular sections [1][2][3][9][10][11][12], di erent uid ow cases such as natural and forced convection heat transfer, non-Newtonian uids, pulsating ow ÿelds and moving boundaries [6,10,12,13], di erent inlet boundary conditions such as uniform entry, zero-vorticity and non-uniform entry proÿles [1-3, 9, 13] and di erent numerical approaches such as ÿnite volume, ÿnite element and ÿnite di erence methods [9,[11][12][13]. However, considerable care is needed observing overshoots in uid ow cases which normally have bulges in the vicinity of their solid boundaries, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Remarks on numerical prediction of wall shear stress in entry flow problems

Darbandi

Hosseinizadeh

2004

Commun. Numer. Meth. Engng.

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SUMMARYToday, commercial CFD codes are widely used to simulate many di erent entry ow problems. The ow in the developing zone undergoes a transition from a speciÿed velocity proÿle at the inlet section to a fully developed proÿle in the region far from the inlet. Previous investigations have shown that the hydrodynamic variables, such as velocity and pressure magnitudes, along the centreline converge to a mesh independent solution even when coarse grid distributions are utilised. However, the present work shows that the local velocity proÿle is highly dependent on grid resolution in the vicinity of solid boundaries. It is shown that failure to account for the grid resolution can result in signiÿcant errors in the predicted solid-uid interaction, e.g. wall shear stress calculation. A remedy to overcome this problem is subsequently given.

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A cost‐effective approach to generate accurate correlations via analyzing a minimum number of data points; Case study on the convection heat transfer problem

Darbandi

Jalali

2022

Can J Chem Eng

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It is very common in the heat transfer area to analyze and design heat equipment using the past available heat correlations. Basically, demanding higheraccuracy correlations enforces the heat laboratories to test and collect larger banks of laboratory data. However, this conversely affects the laboratory cost.Therefore, it becomes challenging to create new approaches that let the correlation developers use smaller experimental datasets and provide correlations with sufficient accuracies. To surmount this challenge, the present work develops a new approach that benefits from the computational fluid dynamics method as a reliable and cheap tool and adequately enriches the original, insufficient dataset. Then, suitable enhanced correlations are developed using the new enriched experimental-numerical-based dataset. In parallel, the artificial neural network (ANN) is used to enrich the original insufficient dataset separately. Using this experimental-ANN-based dataset, it provides a totally ANN-based correlation. It is shown that the results of enhanced correlations are as accurate as those of the ANN-based correlation. However, the point is that the use of the present approach is about 100 times faster than using the ANN. The typical forced convection heat transfer through a pipe is examined here to show the capabilities of the current approach.

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Numerical Study of the Flow Behavior in the Uniform Velocity Entry Flow Problem

Cited by 18 publications

References 25 publications

Three-dimensional compressible–incompressible turbulent flow simulation using a pressure-based algorithm

Three-dimensional compressible–incompressible turbulent flow simulation using a pressure-based algorithm

Remarks on numerical prediction of wall shear stress in entry flow problems

A cost‐effective approach to generate accurate correlations via analyzing a minimum number of data points; Case study on the convection heat transfer problem

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