TUFLOW Message 2991: Difference between revisions
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|alt_msg=WARNING 2991 - Negative V depth at ",a,".
|type=[[WARNING]]
|message_desc=A 2D negative depth has occurred at the cell side. This indicates the solution failed to converge at this point in the 2D domain and is an indicator that the model may become unstable. Note that a separate warning is issued for convergence issues in the 1D domain (see <u>[[TUFLOW Message 1991|Message
|suggestions=Import the messages layer in to your GIS package. Check for the number and time at which these warnings occur. A few warnings at a single location or timestep in the simulation are not normally an issue. Persistent warnings however warrant further investigation. Check the following: <br>
* Look at the '''_zpt_check''' file to see if there is a steep change in topography. Where appropriate, smoothing out the topography or increasing the roughness may help stabilise the model.
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* Repeated warnings may occur due to badly behaving boundary conditions nearby. 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 , verifying that the flow patterns are realistic.<br>
* Check that the timestep is not too large,
|uplink=[[2xxx_TUFLOW_Messages|2xxx Messages]]
}}
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