bluehy 发表于 2008-9-15 09:17

请教cfx计算收敛问题

我做了一个算例,在计算开始时出现错误提示,有负体积的存在,但没有影响计算,在规定迭代步数100步时完成计算,错误提示信息和收敛曲线如下,请问这样计算的结果可靠吗?
      如果不可靠,应该如何寻找负体积,我是用gambit进行的网格划分,曾把提示的负体积坐标输入gambit,可发现该点在坐标原点附近(也就是毂内,我做的是一个叶片分析),请各位指教!
      

ERROR #002100011 has occurred in subroutine cVolSec.
Message:
A negative SECTOR volume has been detected. Execution will proceed
but this is a possible cause of robustness problems.
The location of the first negative volume is reported below.
Volume :-0.2946E-19
Location : ( -0.25220E-01,0.30540E-01,0.87107E-02)
This warning may be made fatal by setting the expert parameter
'negative volume option = 1'.




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cora 发表于 2008-9-15 10:27

你用动网格了?

bluehy 发表于 2008-9-16 08:24

感谢cora的回复,我没有使用动网格,仅仅设置了进口速度,出口压力,参考压力,叶片转速等参数,不知这样的收敛曲线是不是表明计算没收敛?
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