[求助]K-E湍流模型中涡粘性系数Vt的取值范围？

jackliucheng

目前正在算一个射流问题，采用K-E湍流模型。
有个疑问：按照定义，涡粘性系数Vt=Cu*K*K/E，那么Vt应该是K和E函数，其取值随K和E值变化。
但是流体的涡粘性不可能无限大，究竟Vt的值域是多少呢？
谢谢！

turbulencest

按照定义，涡粘性系数涡粘性系数Vt
         ~~~~~~~~~~~~~~~~~~~~~~~ This is just some assumption, not the definition of turbulent visocity.
其取值随K和E值变化 ~~Also this is assumed in turbulent viscosity models.
Actually turbulence models based on 涡粘性系数Vt are to give specific description of 涡粘性系数Vt.
For k-eps, just Cu*K*K/E.
For k-omega, another experssion.

jackliucheng

turbulencest,thank you for your answer.
as you said, in k-eps model,let Vt=Cu*K*K/E, then could you tell me the range of it?
that is an important question for me to calculate k and eps, you know, if I get a wrong Vt, the k and eps should not be true.
or,
I can get some important information from Vt to know whether my results are wrong or true.