Numerical and experimental investigation of transient pipe flow

Elansary, Ahmed A.; Chaudhry, M. Hanif; Silva, Walter

doi:10.1080/00221689409498709

Cited by 28 publications

(11 citation statements)

References 7 publications

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“…This disagreement is considered as a result of an inadequate estimation of the shear stress for unsteady ow using the equation for the steady state [19][20][21][22]. It is accepted commonly that the steady-state equation for friction is not able to reproduce accurately the shear stress during transient ow [23]. For this reason, the e ort of many authors is oriented to improve the evaluation of the shear stress for unsteady pipe ow.…”

Section: Numerical Tests and Discussion Of Obtained Resultsmentioning

confidence: 98%

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Analysis of unsteady pipe flow using the modified finite element method

Szymkiewicz

Mitosek

2004

Commun. Numer. Meth. Engng.

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SUMMARYA modiÿed ÿnite element method is proposed to solve the unsteady pipe ow equations. This approach yields a six-point implicit scheme with two weighting parameters. An accuracy analysis carried out using the modiÿed equation approach showed that the proposed scheme has higher accuracy compared to other methods. A comparison of experimental data and the results of numerical solution showed that the required damping and smoothing of a pressure wave can be obtained when numerical di usion is produced by the applied method. It suggests that the physical dissipation process observed in the water hammer phenomenon is not represented properly in its mathematical model. Therefore, the classical system of water hammer equations seems to be incomplete.

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Section: Numerical Tests and Discussion Of Obtained Resultsmentioning

confidence: 98%

“…| |61 (23) in this case takes the following form: It has to be satisÿed for any wave number m. This takes place when…”

Section: Solution Of the Water Hammer Equations By The Modified Femmentioning

confidence: 99%

Analysis of unsteady pipe flow using the modified finite element method

Szymkiewicz

Mitosek

2004

Commun. Numer. Meth. Engng.

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“…Precursor waves were observed in their study. Poissoncoupled FSI in a long horizontal pipe excited by valve stroking was investigated by Elansary et al [30]. They compared the classic waterharnmer solution with the FSI formulation and concluded that the latter gave improved results: Poisson coupling dampened the predicted pressure oscillations.…”

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confidence: 99%

Fluid transients and fluid-structure interaction in flexible liquid-filled piping

Wiggert

Tijsseling

2001

Applied Mechanics Reviews

178

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Fluid-structure interaction in piping systems (FSl) consists of the transfer of momentum and forces between piping and the contained liquid during unsteady flow. Excitation mechanisms may be caused by rapid changes in flow and pressure or may be initiated by mechanical action of the piping. The interaction is manifested in pipe vibration and perturbations in velocity and pressure of the liquid. The resulting loads imparted on the piping are transferred to the support mechanisms such as hangers, thrust blocks, etc. The phenomenon has recently received increased attention because of safety and reliability concerns in power generation stations, environmental issues in pipeline delivery systems, and questions related to stringent industrial piping design performance guidelines. Furthermore, numerical advances have allowed practitioners to revisit the manner in which the interaction between piping and contained liquid is modeled, resulting in improved techniques that are now readily available to predict FSI. This review attempts to succinctly summarize the essential mechanisms that cause FSI, and present relevant data that describe the phenomenon. In addition, the various numerical and analytical methods that have been developed to successfully predict FSI will be described. Several earlier reviews regarding FSI in piping have been published; this review is intended to update the reader on developments that have taken place over the last approximately ten years, and to enhance the understanding of various aspects of FSI. Tables (1-2) 79

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“…With the inclusion of two or more of these items in the analysis, eleven possibilities are offered from which some combinations already have been studied and some have not. The combinations of VE and UF (Covas et al, 2004a(Covas et al, , b, 2005Soares et al, 2008;Duan et al, 2010), CS and UF (Bughazem and Anderson, 2000;Bergant et al, 2008a, b), FSI and UF (Elansary et al, 1994), FSI and CS (Fan and Tijsseling, 1992;Tijsseling and Vardy, 2005) and VE and CS (Soares et al, 2009;Hadj-Taïeb and Hadj-Taïeb, 2009 ;Keramat et al, 2010) have already been investigated. The remaining combination of two, namely FSI and VE, is the scope of this article.…”

Section: Introductionmentioning

confidence: 99%