WRF3.9模拟江苏地区暴雨的问题

anlizheng

朝曦dawn 发表于 2017-7-30 20:04
最近我也才开始学，看到官方文档有这么个说明：

The positive-definite and monotonic options are avai ...

我看默认的设置是positive-definite

anlizheng

朝曦dawn 发表于 2017-7-28 20:28
mp_physics: 4试试呢

谢谢，我来试试

anlizheng

astiny 发表于 2017-7-26 11:57
模拟暴雨本来就是玄学。而且直接输出的一般多少都有问题。找几个靠谱的诊断量才好。

谢谢你的建议

朝曦dawn

positive definite有几个注意事项的：
Some model filters may not be positive definite.
i. diff_6th_opt = 1 is not positive definite nor monotonic. Use diff_6th_opt = 2
if you need this diffusion option (diff_6th_opt = 2 is monotonic and positivedefinite).
We have encountered cases where the departures from
monotonicity and positive-definiteness have been very noticeable.
ii. diff_opt = 1 and km_opt = 4 (a commonly-used real-data case mixing option)
is not guaranteed to be positive-definite nor monotonic due to the variable
eddy diffusivity, K. We have not observed significant departures from
positive-definiteness or monotonicity when this filter is used with these
transport options.
iii. The diffusion option that uses a user-specified constant eddy viscosity is
positive definite and monotonic.
iv. Other filter options that use variable eddy viscosity are not positive definite or
monotonic.

anlizheng

朝曦dawn 发表于 2017-7-30 21:18
positive definite有几个注意事项的：
Some model filters may not be positive definite.
i. diff_6th_o ...

按照这个说法的话可以把diff_6th_opt 改成2，先试试能不能改进效果

朝曦dawn

anlizheng 发表于 2017-7-30 21:40
按照这个说法的话可以把diff_6th_opt 改成2，先试试能不能改进效果

嗯，diff_opt = 1 and km_opt = 4还有其他的diffusion选项看它说的感觉模棱两可，就改个diff_6th_opt试试吧。我还在看guide，还没跑wrf呢

anlizheng

朝曦dawn 发表于 2017-7-30 21:47
嗯，diff_opt = 1 and km_opt = 4还有其他的diffusion选项看它说的感觉模棱两可，就改个diff_6th_opt试试 ...

先跑个个例试试改不改有多大区别，只能一个个试了

朝曦dawn

http://sci-hub.cc/10.1117/12.2185766这篇文章可以参考一下

anlizheng

朝曦dawn 发表于 2017-7-31 10:18
http://sci-hub.cc/10.1117/12.2185766这篇文章可以参考一下

谢谢，我来看看

eyeside

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