2D的模型和3D的模型结果怎么差了一个数量级?
我在一个3D的模型上加一个圆形均布荷载,然后采用3D模型的中间剖面建立一个2D的模型,荷载为和圆直径相等的线均布荷载但计算结果差了一个数量级?为什么啊?》有没有3D和2D荷载的等效的方法啊? 你的对称约束加了没有?
回复 #2 xuruikl 的帖子
加了3D的加了三个方向的2D的加了两个方向的整个模型就是几个长方体的块(对称) 上面有个圆形荷载 误差是肯定会有的
但不至于差一个数量级啊 贴图附带数据说明。
回复 #5 venture 的帖子
在线上加均布力的时候,输力的大小的时候,有两个格子可以输数字,分别有什么区别啊?在面上.............................................................................................................? 原帖由 cscuxj 于 2007-8-13 03:20 发表 http://www.chinavib.com/forum/images/common/back.gif
在线上加均布力的时候,输力的大小的时候,有两个格子可以输数字,分别有什么区别啊?
在面上.............................................................................................................?
自己看看:lol
VALI, VALJ Surface load values at the first keypoint (VALI) and at the second keypoint (VALJ) of the line, or table name for specifying tabular boundary conditions. If VALJ is blank, it defaults to VALI. If VALJ is zero, a zero is used. If Lab = CONV, VALI and VALJ are the film coefficients and VAL2I and VAL2J are the bulk temperatures. To specify a table, enclose the table name in percent signs (%), e.g., %tabname%. Use the *DIM command to define a table. If Lab = CONV and VALI = -N, the film coefficient may be a function of temperature and is determined from the HF property table for material N [MP]. If Lab = RAD, VALI and VALJ values are surface emissivities and VAL2I and VAL2J are ambient temperatures. The temperature used to evaluate the film coefficient is usually the average between the bulk and wall temperatures, but may be user defined for some elements. If Lab = RDSF, VALI is the emissivity value; the following condition apply: If VALI = -N, the emissivity may be a function of the temperature and is determined from the EMISS property table for material N [MP]. If Lab = VFRC, VALI is the boundary value (defaults to 1). If Lab = FSIN in a Multi-field solver (single or multiple code coupling) analysis, VALI is the surface interface number. If Lab = FSIN in a unidirectional ANSYS to CFX analysis, VALJ is the surface interface number (not available from within the GUI) and VALI is not used unless the ANSYS analysis is performed using the Multi-field solver.
回复 #7 venture 的帖子
你太不厚道了:lol均布荷载的普通形式是三角荷载,两个数字分别代表三角荷载两端的数值。
如果是均布荷载那就是两个都填一样的 原帖由 orc_hard 于 2007-8-16 13:19 发表 http://www.chinavib.com/forum/images/common/back.gif
你太不厚道了:lol
均布荷载的普通形式是三角荷载,两个数字分别代表三角荷载两端的数值。
如果是均布荷载那就是两个都填一样的
如果是均布荷载那就是两个都填一样的=如果是均布荷载填第一个,空第二个。
自己看印象才深刻嘛:lol 我当时做热效应分析的时候也遇到过类似的问题,三维模型和二维模型计算的温度结果相差甚远,而且边界条件内热源都没有错误,后来感觉应该三维计算的结果更接近实际情况。看到一些杂志上面公开发表的文章凡是二维ansys计算的温度、应力、形变结果普遍不太对。
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