Introduction to CFD

Jamshed, Shamoon

doi:10.1016/b978-0-12-801567-4.00001-5

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…However, the considered case should be the most valid for the sake of safety, since no expansion of the liner is permitted due to the absence of gaps between the liner and the host pipe. Another idea about further works could be to develop a CFD model [25][26][27] to verify also numerically the effects of the presence of a liner inside the host pipe.…”

Section: Final Considerations and Further Studiesmentioning

confidence: 99%

Wave celerity in hydraulic transients computation for CIPP-rehabilitated pipes

Evangelista¹,

Hernández²,

Mambretti³

et al. 2020

Int. J. CMEM

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Most of the water pipe infrastructure is outdated; therefore, frequent maintenance and repair works are required. To speed up the rehabilitation work and to have a more sustainable and efficient approach, trenchless methodologies have been developed in the last decades. One of the most cost-effective trenchless methods is the so-called Cured in Place Pipeline (CIPP) method, in which a resin-impregnated liner is pulled or inverted inside the host pipe and, when cured, it restores the old pipe structural and mechanical integrity. The aim of this study is to analyse the effects of the presence of a CIPP liner in a deteriorated pipe during unsteady flow for compressible fluids. In particular, the paper deals with a new formulation to compute the celerity of the wave which produces the overpressures, when the pipe wall is composed of both the host (old) pipe and the new liner, whose thickness depends on the required mechanical characteristics. The problem is strictly dependent on the mechanical properties of the liner. In order to obtain the new formula for celerity, the linear elastic problem for multi-layered pipes has been solved. The theoretical results have been validated by performing numerical simulation analysis using a Boundary Element model, with the software BEASY ™. The resulting circumferential strain is integrated in the continuity equation, deriving the new formula to compute the wave celerity. The values of the celerity are dependent on the thickness and on the elastic properties of the liner. The behaviour of several combinations of thickness of the liner and Young's modulus values has been studied and the results have been critically shown in the paper.

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Section: Final Considerations and Further Studiesmentioning

confidence: 99%

Wave celerity in hydraulic transients computation for CIPP-rehabilitated pipes

Evangelista¹,

Hernández²,

Mambretti³

et al. 2020

Int. J. CMEM

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“…The basis of this equation lies in the assumption that fluid particles are deformed by shear stress. The CFD approach uses the second law of motion and conservation including the conservation of momentum, mass, and energy (Jamshed, 2015).…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

“…In addition, FVM can also be used in cases involving discontinuities in the flow which cannot be calculated using the FDM method. In FVM, the term "volume" refers to the fluid dynamics equation in which the domain is discretized using volume control to take discrete points on the mesh (Jamshed, 2015).…”

Section: Computational Fluid Dynamics (Cfd)mentioning

confidence: 99%

Application of core annular flow for oil transportation in different pipe configurations using computational fluid dynamics

Dianita

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The application of Core Annular Flow (CAF) has become an interesting solution in transporting heavy oil through pipeline because of its energy reduction and cost efficiency. Current study conducted a 3D computational fluid dynamic (CFD) to simulate CAF of oil-water in horizontal T- and Y-pipe junctions with two types of oil characteristic i.e., oil as Newtonian fluid and oil as non-Newtonian Carreau Fluid. The 2k factorial statistical experimental design was applied to investigate the effect of geometry on the flow performance. Eight cases were run with different diameter combinations and junction angle. The most attractive design was measured by the high value of oil holdup with small average values of pressure gradient and pressure standard deviation. The simulation result showed the stable CAF along the upstream region but then broke up when passing the intersection. A strategy to recover the stability of CAF after passing the intersection area of a T-pipe without interrupting the flow process was also proposed specifically for T50-50 (T-pipe with inlet and outlet diameter of 50 mm) as the most desired design for water-oil as non-Newtonian Carreau Fluid case. An additional water insertion was introduced at the intersection point to support the recovery of CAF structure by suppressing fouling. The proposed design showed significant improvement of CAF consistency for downstream region until pipe outlets. Energy evaluation was also has been conducted and it was estimated that CAF in T50-50 was able to reduce the pressure drop to more than 90% compared to transportation without lubrication.� In addition, the cost of power consumption can be saved to more than 80% than single phase oil transportation. A scaled-up pipe size simulation was also completed to 10 times bigger dimension. More consistence result of lubricated flow was shown by bigger dimension pipe. �

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