Flotherm 教程 Extending the Solution Domain and Introduction to Localized Grid.pptVIP

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Flotherm 教程 Extending the Solution Domain and Introduction to Localized Grid.ppt

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Flotherm 教程 Extending the Solution Domain and Introduction to Localized Grid

FLOTHERM V4.1 Introductory Training Course FLOTHERM/L/05/03 V4.1 Issue 1.0 Lecture 5A Extending the Solution Domain and Introduction to Localized Grid Why Extend the Solution Domain? In certain circumstances it is necessary to extend the solution domain Natural Convection Systems Sealed Systems When external conditions influence internal conditions It is not usually necessary to do this in forced convection systems Exception: Fans are aligned with the edge of the enclosure. How much do I need to extend the domain by? The domain is extended so that the boundaries are far enough away that they do not affect the results within the enclosure, or to a known boundary condition Moving the domain boundary away from the enclosure walls will allow the outer heat transfer coefficient to be calculated by FLOTHERM rather than being specified in the ambient attached at the domain boundary How much do I need to extend the domain by? Rule of Thumb Domain boundary placed half enclosure width away from the enclosure How much do I need to extend the domain by? Rule of thumb Domain boundary placed twice the enclosure height above Domain extended as far as the table (or other solid boundary) where the enclosure is placed Summary of Domain Positioning Suggested domain boundary positions ? enclosure width around the sides 2 enclosure height above 1 enclosure height below, assuming there is no solid geometry or to the solid geometry below Remember: Extending the domain too far will require more grid cells and therefore will take longer to solve. There is no hard and fast rule for where the solution domain should be placed. It is normal to place the boundary where we have a good set of boundary conditions. This is usually where we can describe what is happening. E.g. a wall. In the case of sealed systems and natural convection cases we need to capture the resulting airflow away from the enclosure as this is critical to how the enclosure will be cooled in its environment. We cannot ac