Numerical Modeling Of Natural And Ventilated Cavitating Flows
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Numerical Modeling Of Natural And Ventilated Cavitating Flows
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Author : Qiao Qin
language : en
Publisher:
Release Date : 2004
Numerical Modeling Of Natural And Ventilated Cavitating Flows written by Qiao Qin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Cavitation categories.
Numerical Simulation And Analysis Of Multi Scale Cavitating Flows Using A Hybrid Mixture Bubble Model
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Author : Ebrahim Ghahramani
language : en
Publisher:
Release Date : 2020
Numerical Simulation And Analysis Of Multi Scale Cavitating Flows Using A Hybrid Mixture Bubble Model written by Ebrahim Ghahramani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Finite Element Simulation Of Simple Three Dimensional Fully Cavitating Flows
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Author : Peter Y. Ko
language : en
Publisher:
Release Date : 1979
Finite Element Simulation Of Simple Three Dimensional Fully Cavitating Flows written by Peter Y. Ko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Cavitation categories.
Based on potential flow theory, a formulation is given for three-dimensional fully cavitating flow with a Riabouchinsky model. The model is nonlinear and the location of the free surface of the cavity is not known priori. Therefore, an iterative procedure is used to locate the free surface boundary. The employment of a trial-free-boundary approach effectively reduces the fully nonlinear model to a linear one, and the solution at each iteration is obtained by means of the finite element method (FEM). Examples studied were fully cavitating flow past flat plates in a water tunnel. Results are given for pure drag flows past circular and elliptic plates and a lifting flow past a circular plate. Because of the change in flow boundary conditions at the separation edge and the failure of the FEM to resolve these conditions accurately, the ability of the numerical solution to maintain a constant pressure over the entire cavity decreases as the three dimensionality of the free surface increases. However, the present procedure produces absolutely stable iterations and shows no sign of drifting of the free surface. It is found that satisfaction of a tangent separation condition of the free surface from the flat plate body is crucial for the stability of the iterative procedure. Grid refinement in both the streamwise and transverse directions reduces the computational error. While free surface movement between iterations is a useful convergence criterion, a flow-rate balance between upstream and downstream cross-sections appears not to be a good criterion.
Numerical Simulation Of Cavitating Bubble Laden Turbulent Flows
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Author : Ehsan Shams Sobhani
language : en
Publisher:
Release Date : 2010
Numerical Simulation Of Cavitating Bubble Laden Turbulent Flows written by Ehsan Shams Sobhani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Cavitation categories.
Many engineering devices and propulsion systems suffer from undesirable effects of cavitation; such as degradation in the efficiency of pumps and turbines, generation of noise and vibration on ship propeller, increased drag and erosion of propeller blade, etc. In spite of decades of research on this problem, detailed study of cavitation physics is still a technical challenge for the current experimental and numerical approaches. Further development of robust and accurate numerical methods for cavitating flow simulation, is the basis of this research. The main objective of this research is to investigate traveling bubble cavitation in turbulent flows. Variable density Navier-Stokes equations are solved in an unstructured grid finite volume solver. Large Eddy Simulation technique with dynamic Smagorinsky subgrid model is used for turbulence modeling. Bubble cavitation is modeled in a Lagrangian framework with subgrid models for forces acting on bubbles. Bubble size variation is modeled using local flow field hydrodynamic pressure for solving Rayliegh-Plesset equation. An adaptive time stepping method is devised for the efficient solution of this highly non-linear equation. Turbulent flow over an open cavity is reproduced numerically from the experimental work by [Liu and Katz, PoF, 08]. Flow statistics agreed very well to those of experiment. Cavitation inception was studied using two different models: (i) discrete bubble model, and (ii) scalar transport model. Severe cavitation was predicted near on top of the trailing edge for cavitation index of [delta]
New Trends In Fluid Mechanics Research
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Author : F. G. Zhuang
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-04-24
New Trends In Fluid Mechanics Research written by F. G. Zhuang and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-04-24 with Science categories.
This volume is the proceedings of the Fifth International Conference on Fluid Mechanics (ICFM-V), the primary forum for the presentation of technological advances and research results in the fields of theoretical, experimental, and computational Fluid Mechanics. Topics include: flow instability and turbulence, aerodynamics and gas dynamics, industrial and environmental fluid mechanics, biofluid mechanics, geophysical fluid mechanics, plasma and magneto-hydrodynamics, and others.
Numerical Simulation Of Steady And Unsteady Cavitating Flows Inside Water Jets
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Author : Shu-Hao Chang
language : en
Publisher:
Release Date : 2012
Numerical Simulation Of Steady And Unsteady Cavitating Flows Inside Water Jets written by Shu-Hao Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Multiphase Cfd Modeling Of Developed And Supercavitating Flows
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Author : Robert F. Kunz
language : en
Publisher:
Release Date : 2001
Multiphase Cfd Modeling Of Developed And Supercavitating Flows written by Robert F. Kunz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Engineering interest in natural and ventilated cavities about submerged bodies and in turbomachinery has led researchers to study and attempt to model large scale cavitation for decades. Comparatively simple analytical methods have been used widely and successfully to model developed cavitation, since the hydrodynamics of these flows are often dominated by irrotational and rotational inviscid effects. However, a range of more complex physical phenomena are often associated with such cavities, including viscous effects, unsteadiness, mass transfer, three-dimensionality and compressibility. Though some of these complicating physics can be accommodated in simpler physical models, the ongoing maturation and increased generality of multiphase Computational Fluid Dynamic (CFD) methods has motivated recent research by a number of groups in the application of these methods for developed cavitation analysis. This paper focuses on the authors' recent research activities in this area. The authors have developed an implicit algorithm for the computation of viscous two-phase flows. The baseline differential equation system is the multi-phase Navier-Stokes equations, comprised of the mixture volume, mixture momentum and constituent volume fraction equations. Though further generalization is straightforward, a three-species formulation is pursued here, which separately accounts for the liquid and vapor (which exchange mass) as well as a non-condensable gas field. The implicit method developed employs a dual-time, preconditioned, three-dimensional algorithm, with muti-block and parallel execution capabilities. Time-derivative preconditioning is employed to ensure well-conditioned eigenvalues, which is important for the computational efficiency of the method.
Numerical Modeling Of Cavitation Phenomenon In Flowing Fluids
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Author : Kevan E. Quammie
language : en
Publisher:
Release Date : 2004
Numerical Modeling Of Cavitation Phenomenon In Flowing Fluids written by Kevan E. Quammie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Fluid dynamics categories.
A Numerical Approach For Modelling Cavitating Flows
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Author : M.S. Ingber
language : en
Publisher:
Release Date : 1991
A Numerical Approach For Modelling Cavitating Flows written by M.S. Ingber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Engineering Design Applications Ii
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Author : Andreas Öchsner
language : en
Publisher: Springer
Release Date : 2019-06-27
Engineering Design Applications Ii written by Andreas Öchsner and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-27 with Technology & Engineering categories.
This book offers an update on recent developments in modern engineering design. Different engineering disciplines, such as mechanical, materials, computer and process engineering, provide the foundation for the design and development of improved structures, materials and processes. The modern design cycle is characterized by the interaction between various disciplines and a strong shift to computer-based approaches where only a few experiments are conducted for verification purposes. A major driver for this development is the increased demand for cost reduction, which is also linked to environmental demands. In the transportation industry (e.g. automotive or aerospace), the demand for higher fuel efficiency is related to reduced operational costs and less environmental damage. One way to fulfil such requirements is lighter structures and/or improved processes for energy conversion. Another emerging area is the interaction of classical engineering with the health and medical sector.