Handbook of Turbomachinery (Mechanical Engineering (Marcell by Jr.,Earl Logan

By Jr.,Earl Logan

Presents info at the research, layout, operation and trying out of turbomachinery, detailing the functionality of gasoline, hydraulic and steam generators. crucial turbomachinery ideas and systems recommended via specialists are offered jointly during this quantity.

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In a multigrid algorithm, the solution is performed at each time step on a series of grids of increasing coarseness, to reduce the low-frequency errors in the solution. This convergence acceleration technique is described by Jameson and Baker [66], and has been applied to many analysis methods, including that of Dawes [77]. Multigrid schemes are ideally suited to structured grids, because the coarser grids can be easily generated by combining cells from the denser grid. However, a multigrid technique has recently been applied to an unstructured grid analysis, as described by Smith [78].

The display of multiple images on the screen is also desirable, to allow inspection or evaluation of more than one view at a time. Displays must also be generated rapidly, to provide utility to the component designer. A graphical user interface can provide ease of use for the pre- and post-processors by allowing control, from the screen, for the displays and functions provided by the tools. Dials, buttons, and menus on the screen can be mouse-driven by the user. To support pre- and postprocessors with such capabilities typically requires the use of a graphics workstation.

Although the initialization can be somewhat crude and still yield a successful solution, convergence can often be accelerated, if the initialized flow distribution is reasonably realistic. Often, solutions from a preliminary design streamwise curvature program or a 3D inviscid analysis can be adapted for use as a flow-field initialization for steady flows. Similarly, unsteady flows are typically initialized using the steady flow solution. Having established a set of governing equations for the flow, and having also identified the necessary boundary conditions that must be specified in association with those equations, it remains to deal with the turbulence closure by selecting an appropriate turbulence model.

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