Numerical Prediction of Incompressible Turbulent Swirling Flows in Circular Sectioned Ducts and Annuli PDF Download
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Author: Toksoz Byram Karasu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Toksoz Byram Karasu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Tahir Karasu
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 280
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Book Description
Author: Gad Hetsroni
Publisher: CRC Press
ISBN: 9780891169093
Category : Heat
Languages : en
Pages : 576
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Book Description
A collection of papers written for the Ninth International Heat Transfer Conference held in Jerusalem in 1990. The topics covered include natural convection, phase change, heat transfer augmentation, heat exchangers, two-phase flows and conduction and insulation.
Author: T. Nejat Veziroğlu
Publisher:
ISBN:
Category : Multiphase flow
Languages : en
Pages : 688
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Author: Juan Ignacio Ramos
Publisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages :
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Author: R. C. Buggeln
Publisher:
ISBN:
Category : Laminar flow
Languages : en
Pages : 84
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Book Description
Both laminar and turbulent flows in strongly curved ducts, channels, and pipes are studied by numerical methods. The study concentrates on the curved square-duct geometry and flow conditions for which detailed measurements have been obtained recently by Taylor, Whitelaw, and Yianneskis. The solution methodology encompasses solution of the compressible ensemble-averaged Navier-Stokes equations at low Mach number using a split linearized block implicit (LBI) scheme, and rapid convergence on the order of 80 noniterative time steps is obtained. The treatment of turbulent flows includes resolution of the viscous sublayer region. A series of solutions for both laminar and turbulent flow and for both two- and three-dimensional geometries of the same curvature are presented. The accuracy of these solutions is explored by mesh refinement and by comparison with experiment. In summary, good qualitative and reasonable quantitative agreement between solution and experiment is obtained. Collectively, this sequence of results serves to clarify the physical structure of these flows and hence how grid selection procedures might be adjusted to improve the numerical accuracy and experimental agreement. For a three-dimensional flow of considerable complexity, the relatively good agreement with experiment obtained for the turbulent flow case despite a coarse grid must be regarded as encouraging. (Author).
Author: Qingyan Chen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: British Library. Lending Division
Publisher:
ISBN:
Category : Great Britain
Languages : en
Pages : 1284
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Author: Avelino Parcon Rochino
Publisher:
ISBN:
Category : Turbulence
Languages : en
Pages : 8
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723440199
Category :
Languages : en
Pages : 200
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Book Description
A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed. Separated flows, the flow in a curved duct, and swirling flows are examples of flow fields where streamline curvature plays a dominant role. A comprehensive literature review on the effect of streamline curvature was conducted. New algebraic formulations for the eddy viscosity incorporating the kappa-epsilon turbulence model are proposed to account for various effects of streamline curvature. The loci of flow reversal of the separated flows over various backward-facing steps are employed to test the capability of the proposed turbulence model in capturing the effect of local curvature. The inclusion of the effect of longitudinal curvature in the proposed turbulence model is validated by predicting the distributions of the static pressure coefficients in an S-bend duct and in 180 degree turn-around ducts. The proposed turbulence model embedded with transverse curvature modification is substantiated by predicting the decay of the axial velocities in the confined swirling flows. The numerical predictions of different curvature effects by the proposed turbulence models are also reported. Cheng, Chih-Hsiung and Farokhi, Saeed Unspecified Center DUCTED FLOW; EDDY VISCOSITY; FLOW DISTRIBUTION; K-EPSILON TURBULENCE MODEL; MATHEMATICAL MODELS; SEPARATED FLOW; TURBULENT FLOW; BACKWARD FACING STEPS; COMPUTATIONAL FLUID DYNAMICS; CURVATURE; SWIRLING...
