定常热分析中的几个问题请教:
1. 在定常热分析中,给part表面添加初始温度边界, 其中的surface applied temperature 和surface temperature,前者有stiffness,后者没有. 这两种施加方法在应用时有何区别?2. 分析时发现,设定分析参数时, 将缺省节点温度设置为40.5度。 然后 模型中一部分节点温度设置为4度, 未添加温度边界的节点按说应该默认是这个值40.5度,但是分析结果中整个场的温度却均为4度。 当把未添加温度边界的节点定义为40.5度以后，才能分析得到合理的温度场分布。不知是何原因。 1.
surface temperature用于指定初始温度：A nodal temperature specifies the temperature of the node at the beginning of the analysis (time = 0). 此温度可能随时间改变。
applied temperature在定常分析中保持节点温度不变。 In a steady state heat transfer analysis, an applied temperature is used to fix a node to a certain temperature throughout the analysis. 在定常分析中，surface temperature通常不起作用。In a steady state heat transfer analysis, the temperature at time 0 has no affect unless the model contains some type of nonlinear temperature effect (temperature dependent material properties, radiation, temperature dependent convection, and so on). 明白了,多谢chuman.这样说来surface temperature应该是常用在瞬态热分析中赋予节点初始温度的. 问题2.
设定分析参数时,缺省节点温度也是用于设定初始值的.If no temperature is applied to a node, that node will start the analysis with the temperature defined in the "Default nodal temperature" field in the "Options" tab of the "Analysis Parameters" dialog.
所以对于定常分析, 你设的值也就没什么作用了. 原帖由 chuman 于 2008-7-18 23:27 发表 http://www.simwe.com/forum/images/common/back.gif
问题2.
设定分析参数时,缺省节点温度也是用于设定初始值的.If no temperature is applied to a node, that node will start the analysis with the temperature defined in the "Default nodal temperature" field ...
多谢,也就是说缺省接点温度只能是在瞬态问题里起作用.
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