fluent解決湍流黏度極大化異常：turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 323 cells

2016-09-23  by:CAE仿真在線  來(lái)源:互聯(lián)網(wǎng)

fluent中如果碰到這種問(wèn)題怎么辦?

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 323 cells 

10  2.5534e-01  1.0327e-01  1.3359e-01  4.1522e-02  8.7016e-01  8.1969e+00  0:00:27   10

 turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 323 cells 
 reversed flow in 3672 faces on pressure-inlet 7. 
 turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 14294 cells 
 turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 14294 cells 
 reversed flow in 2341 faces on pressure-inlet 7. 
 turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 34741 cells 

12  2.4375e+01  1.2669e-01  3.5383e-02  1.0733e-02  6.3858e+00  8.3954e+02  0:00:22    8

首先來(lái)看看問(wèn)題:湍流黏度( turbulent viscosity)超過(guò)一個(gè)巨大的值,為啥會(huì)出現(xiàn)這種粘度如此高的情況?一般是因?yàn)榫W(wǎng)格差或初始化條件錯(cuò)誤導(dǎo)致

比如k-epsilon通常需要提供初始湍動(dòng)能及其擴(kuò)散率,如果這個(gè)參數(shù)為0,會(huì)導(dǎo)致湍動(dòng)能不能擴(kuò)散,即會(huì)導(dǎo)致局部地方湍動(dòng)能極大化,從而導(dǎo)致異常的湍流,問(wèn)題就在這里。

你可以調(diào)整一下湍動(dòng)能擴(kuò)散率,以及提供合理的初始化湍動(dòng)能,來(lái)解決這個(gè)問(wèn)題。

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