关于GAP边界
我建了个模,怎么加GAP否出现下面的情况:ADINA-F data input file D:\work\8.31shuiji_f.dat successfully created.
***WARNING: In gap BCD 2 surface 5 has no downstream elements attached.
No downstream nodes found for gap BCD 2. The Gap BCD is ignored.
请问这个GAP边界条件怎么施加啊?? 二维模型还是三维?如果是二维选线,三维选面,但注意只能是内部的线或面.也就是说gap只是两个流体域之间的一个界面.
你选的界面条件不对,自然会出现上面的提示了.
回复 #2 cnab 的帖子
我做的是3维的选择的是出口表面.象你这么说,要娶哪个面的话需要选择体的FACE?
但是我是用延伸的方式做的VOMULES,选择FACE的话必须在BODY里面才可以选择呢?
[ 本帖最后由 yumingkun 于 2007-8-11 09:39 编辑 ] 二维模型还是三维?如果是二维选线,三维选面,但注意只能是内部的线或面.也就是说gap只是两个流体域之间的一个界面.
你选的界面条件不对,自然会出现上面的提示了.
-------------上面并没有说要选体的FACE呀.VOMULES你选surface就行啦.但如果你是选出口表面,用GAP来做什么呢?GAP是两个流体域之间的一个界面,当然是一个内部的FACE或者surface,重点在这儿!!你选的是一个外面的面.
回复 #4 cnab 的帖子
那VOMULES里面的选项surface,怎么用呢?把 suiface放在2个VOMULES中间来处理么?那出口处的阀门的开关怎么处理呢?? ----- 那出口处的阀门的开关怎么处理呢??如果你确实要做"出口处的阀门的开关",我觉得可以在出口处人为的构建一个内部面,作为两个流体域的界面.gap的开关有三种控制方式:时间,尺寸,压差
我觉得你还是看一下理论手册中关于gap的描述吧. 提供个例子给大家参考一下
回复 #7 武汉游侠 的帖子
谢谢斑竹~~~回复 #6 cnab 的帖子
我下载的理论手册里面没有关于GAP的描述，只提到GAP这个边界条件而已。兄弟，能不能把你的关于GAP边界条件的理论给我一份啊？我的qq120299198，E-mail：yumingkun@163.com 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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