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Turbulence model sensitivity and scour gap effect of unsteady flow around pipe: a CFD study.

Ali A, Sharma RK, Ganesan P, Akib S - ScientificWorldJournal (2014)

Bottom Line: A numerical investigation of incompressible and transient flow around circular pipe has been carried out at different five gap phases.Flow equations such as Navier-Stokes and continuity equations have been solved using finite volume method.Unsteady horizontal velocity and kinetic energy square root profiles are plotted using different turbulence models and their sensitivity is checked against published experimental results.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

ABSTRACT
A numerical investigation of incompressible and transient flow around circular pipe has been carried out at different five gap phases. Flow equations such as Navier-Stokes and continuity equations have been solved using finite volume method. Unsteady horizontal velocity and kinetic energy square root profiles are plotted using different turbulence models and their sensitivity is checked against published experimental results. Flow parameters such as horizontal velocity under pipe, pressure coefficient, wall shear stress, drag coefficient, and lift coefficient are studied and presented graphically to investigate the flow behavior around an immovable pipe and scoured bed.

Show MeSH
Horizontal velocity profile (Ux) in the gap at (X/D = 0) and at different scour gaps, ○ 10 min, △ 30 min, ⋄ 100 min, × 200 min, and + 300 min.
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Related In: Results  -  Collection


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fig8: Horizontal velocity profile (Ux) in the gap at (X/D = 0) and at different scour gaps, ○ 10 min, △ 30 min, ⋄ 100 min, × 200 min, and + 300 min.

Mentions: Figure 8 shows the horizontal velocity profile under the pipe (obstruction) at X/D = 0 for different types of scoured bed profiles as presented in Figure 7. A higher horizontal velocity can be expected for the scoured bed profiles of 10 min and 30 min due to a narrow gap under the pipe to the surface of the bed. The opposite can be said for the scoured bed profiles of 100, 200, and 300 min. A reduction of around 18% of horizontal velocity is observed from time phase from 10 min to 300 min.


Turbulence model sensitivity and scour gap effect of unsteady flow around pipe: a CFD study.

Ali A, Sharma RK, Ganesan P, Akib S - ScientificWorldJournal (2014)

Horizontal velocity profile (Ux) in the gap at (X/D = 0) and at different scour gaps, ○ 10 min, △ 30 min, ⋄ 100 min, × 200 min, and + 300 min.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4129154&req=5

fig8: Horizontal velocity profile (Ux) in the gap at (X/D = 0) and at different scour gaps, ○ 10 min, △ 30 min, ⋄ 100 min, × 200 min, and + 300 min.
Mentions: Figure 8 shows the horizontal velocity profile under the pipe (obstruction) at X/D = 0 for different types of scoured bed profiles as presented in Figure 7. A higher horizontal velocity can be expected for the scoured bed profiles of 10 min and 30 min due to a narrow gap under the pipe to the surface of the bed. The opposite can be said for the scoured bed profiles of 100, 200, and 300 min. A reduction of around 18% of horizontal velocity is observed from time phase from 10 min to 300 min.

Bottom Line: A numerical investigation of incompressible and transient flow around circular pipe has been carried out at different five gap phases.Flow equations such as Navier-Stokes and continuity equations have been solved using finite volume method.Unsteady horizontal velocity and kinetic energy square root profiles are plotted using different turbulence models and their sensitivity is checked against published experimental results.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

ABSTRACT
A numerical investigation of incompressible and transient flow around circular pipe has been carried out at different five gap phases. Flow equations such as Navier-Stokes and continuity equations have been solved using finite volume method. Unsteady horizontal velocity and kinetic energy square root profiles are plotted using different turbulence models and their sensitivity is checked against published experimental results. Flow parameters such as horizontal velocity under pipe, pressure coefficient, wall shear stress, drag coefficient, and lift coefficient are studied and presented graphically to investigate the flow behavior around an immovable pipe and scoured bed.

Show MeSH