TUFLOW Message 2991: Difference between revisions
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|type=[[WARNING]]
|message_desc=A negative depth has occurred at the cell side. This indicates the solution failed to converge at this point and is an indicator that the model may become unstable.
|suggestions=Import the messages layer in to your GIS package. A negative depth can be caused by a number of things, llok at the '''_zpt_check''' file to see if there is a steep change in topography, the '''uvpt_check''' shows the Manning's n value at each ceell side. Check this roughness suitable.<br>
A negative depth can also be caused by a badly behaving boundary condition nearby, check if this is occurring near a boundary. This can be 1D/2D, a external 2d (such as a HQ boundary) or a 2D/2D boundary.<br>
View the velocity vectors prior to the message are the flow patterns realistic.<br>
This could also be an indicator of a timestep that is too large. However before reducing the timestep check the suggestions above!
|discussion_page=* [[Talk:TUFLOW Message 2991|Discuss Message 2991]]
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