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发表于 2007-8-13 18:55:10
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来自 四川成都
你软件安装目录下面就有呀.
The gap is an interface between two fluid domains. This condition can
only be applied to internal lines and surfaces of two-dimensional and three-
dimensional computational domains, respectively.
The gap’s status may change due to specified physical conditions,
indicating the connection or disconnection of the two domains. When they
are connected (the gap status is called open), the fluid can flow across the
interface without involving any treatment of boundary conditions. In this
case, the fluid variables are continuous across the interface. When the two
domains are disconnected (the gap status is called closed), the fluid cannot
flow across the interface. The gap condition functions as a no-slip wall
condition to the fluid equations and as a zero heat flux condition to the
temperature equation for both sides of the fluid domains. In this case,
therefore, some solution variables are generally discontinuous (of course,
the velocities are zero and continuous).
A typical application of the gap condition is shown in the next figure.
The enlarged figures indicate the element connections when the gap is open
and closed. When the gap is closed, the elements are disconnected,
representing the disconnection of the two fluid domains. To achieve this
condition, additional nodes are automatically generated at the same
locations as the originally generated nodes (the figure shows here that they
are shifted slightly purely for the purpose of clarification of disconnection).
When the gap is open, the solution variables on these additional nodes are
constrained to their original counterparts. Hence, continuous solution
variables are modeled. |
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