wrf.exe时间步长设置

changsc

模拟4km的case，一直出现如图所示错误，之前有前辈说到是time step的设置问题，我试过好多了，比如60，24，20，10，4，都还是一样的错。还请贴吧大神们指导错误。

气象vivi

Time step (in seconds) for integration.
Best Practice
It is recommended to use a value of 5-6xDX (in km) for a typical case. If you are using many vertical levels and/or with map-scale-factors much larger than 1, you will need to use a smaller time step. If you are getting CFL errors that stop your run, this means your run has become unstable and you may need to decrease this value to about 4xDX (or perhaps even 3xDX). It makes things easier if you use a time step that evenly divides into your history interval so that your output times will be evenly spaced.

changsc

@在那遥远的地方, 您好，首先谢谢您的留言。我看到您之前也遇到过与我类似的情况并解决了，我想向您讨教一下具体解决方法，谢谢。我我的网格分辨率是4km的，然后也已经试过time_step=24的情况了，结果还是报错，会不会是别的错误。我这个是按照WRF手册做的嵌套，外层先做好了12km的模拟，输出wrfout后进行ndown.exe，再将input文件rename成d01之后进行单层4km的wrf.exe就报错了，具体情况就是这样，请大神指导

爱地理不爱物理

好像一般来说积分步长是分辨率的6倍

changsc

嗯，是的，我在WRF的USER GUIDE上看到了DX*6，所以我已经试过24了，输出的结果还是这个错误