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Assessment of K-KL-} model application to oscillatory pipe flow / Ahmed Ramadan Ahmed Bilal ; Supervised Ashraf S. Sabry , Ahmed I. Abdelrahman

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Ahmed Ramadan Ahmed Bilal , 2018Description: 59 P. : charts , facsimiles ; 30cmOther title:
  • على السريان المتردد بأنبوب k-kl-} تقييم تطبيق نموذج [Added title page title]
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Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Power Engineering Summary: The three-equation eddy-viscosity model k-kl-} RANS modeldeveloped by Walters and Cokljat (Walters and Cokljat, 2008) for stationary transitional flows is considered in the present numerical simulation of oscillating pipe flow.ANSYS FLUENT finite-volume solver is used, which enables the introduction of the oscillating pressure gradient as a source term in the governing equation. The fully-developed turbulent flow is first considered and the numerical results are compared with reported experimental data and DNS values (Eggels et al, 1994). Accordingly, the model constant C_}1that corresponds to the turbulent production term is adjusted to0.533replacing its original value of 0.44 for unbounded shear flows. The analytically-resolved oscillating laminar flow problem is next considered as limiting casesfor validation purposes. The resulting instantaneous velocity profiles show excellent agreement with theory. The simulation runs are further extended to transitional oscillating flow at Womeresley numbers of 5, 13 and 26. As anticipated, transition to turbulence is noticed within the deceleration phase, followed by a re-laminarization phase.The present numerical results show good agreement with available DNS profiles within the inner-wall regimesr^+{u2264}100, whereas some deviations are noticed within the outer wake regimes
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Item type Current library Home library Call number Copy number Status Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.11.M.Sc.2018.Ah.A (Browse shelf(Opens below)) Not for loan 01010110075860000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.13.11.M.Sc.2018.Ah.A (Browse shelf(Opens below)) 75860.CD Not for loan 01020110075860000

Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Power Engineering

The three-equation eddy-viscosity model k-kl-} RANS modeldeveloped by Walters and Cokljat (Walters and Cokljat, 2008) for stationary transitional flows is considered in the present numerical simulation of oscillating pipe flow.ANSYS FLUENT finite-volume solver is used, which enables the introduction of the oscillating pressure gradient as a source term in the governing equation. The fully-developed turbulent flow is first considered and the numerical results are compared with reported experimental data and DNS values (Eggels et al, 1994). Accordingly, the model constant C_}1that corresponds to the turbulent production term is adjusted to0.533replacing its original value of 0.44 for unbounded shear flows. The analytically-resolved oscillating laminar flow problem is next considered as limiting casesfor validation purposes. The resulting instantaneous velocity profiles show excellent agreement with theory. The simulation runs are further extended to transitional oscillating flow at Womeresley numbers of 5, 13 and 26. As anticipated, transition to turbulence is noticed within the deceleration phase, followed by a re-laminarization phase.The present numerical results show good agreement with available DNS profiles within the inner-wall regimesr^+{u2264}100, whereas some deviations are noticed within the outer wake regimes

Issued also as CD

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