Screw Compressors: Three Dimensional Computational Fluid by Ahmed Kovacevic, Nikola Stosic, Ian Smith PDF

By Ahmed Kovacevic, Nikola Stosic, Ian Smith

ISBN-10: 3540363025

ISBN-13: 9783540363026

ISBN-10: 3540363041

ISBN-13: 9783540363040

This publication provides the main updated equipment of 3-dimensional modeling of the fluid dymanics and the solid-fluid interplay inside those machines, that are nonetheless being built. including modeling to the layout strategy makes it attainable not just to foretell movement styles extra appropriately, and in addition to figure out distorting results on rotors and casing of strain and temperature distribution in the compressor. Examples define the scope of the utilized mathematical version.

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Additional resources for Screw Compressors: Three Dimensional Computational Fluid Dynamics and Solid Fluid Interaction

Example text

The procedure is fast and efficient for calculation in the numerical CFD solver, because all equations are analytical and the variables are derived explicitly from the pressure, the value of which is obtained from the mass-velocity-pressure coupling procedure. The procedure is equally applicable to ideal gases, and incompressible fluids. 46) is used in the next iteration as a source term. 2. 2 Continuum Model applied to Processes in Screw Machines 23 which the energy is transformed to heat, and time steps smaller than the smallest time scale of the turbulent fluctuations.

The process of replacing a spatial domain by a system of grid points is called grid generation. The grid generation process, referred to as space discretisation, is essential for accuracy, efficiency and ease of numerical solution. Ability to generate an ‘acceptable’ grid system is a factor which determines whether a threedimensional numerical method, such as the finite volume, can be used. Inability to generate an adequate numerical mesh for screw machines was the main reason why they have not been previously analysed by the use of three-dimensional numerical methods.

The numerical points which form the boundary grid lines should coincide with the boundary of the spatial domains. If possible, one set of grid lines should align with the flow direction. This condition is not easy to fulfil, but it helps to obtain an accurate numerical solution. The grid lines should be perpendicular to the boundary. This allows easier implementation and calculation of derivatives at the boundaries of the domain. In the interior, the intersecting lines need be only nearly orthogonal.

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Screw Compressors: Three Dimensional Computational Fluid Dynamics and Solid Fluid Interaction by Ahmed Kovacevic, Nikola Stosic, Ian Smith


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