TUFLOW Message 3027: Difference between revisions
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{{TUFLOW_Message |
{{TUFLOW_Message |
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|tuflow_message=ERROR 3027 |
|tuflow_message=ERROR 3027 - Roughness height specified but nLim less than 0. |
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<br> |
<br> |
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|alt_msg= |
|alt_msg=NA<br> |
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|type=[[ERROR]] |
|type=[[ERROR]] |
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|message_desc=Materials may use use either fixed mannings, depth-varying mannings, or log-law roughness formulations for bed resistance. |
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|message_desc=The limiting Manning’s n value, required for specifying bed resistance with the theoretically derived log law for shallow flows, must be greater than or equal to 0.0. |
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When utilising log-law roughness, a maximum limit for equivalent mannings number is required as the formulation becomes singular at shallow depths. |
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|suggestions=A limiting Manning’s n value (based on the n value that would normally be applied) is specified to transition to conventional n values at greater depths. |
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This limit, provided as the fixed mannings n value in the material data, must be greater than zero. |
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|suggestions=Ensure that all materials that utilise log-law roughness have positive values for mannings n. |
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|prelink=[[TUFLOW_Message_3026|Message 3026]] |
|prelink=[[TUFLOW_Message_3026|Message 3026]] |
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Revision as of 16:09, 2 March 2023
TUFLOW Message
ERROR 3027 - Roughness height specified but nLim less than 0.
Alternate Message
NA
Message Type
ERROR
Description
Materials may use use either fixed mannings, depth-varying mannings, or log-law roughness formulations for bed resistance.
When utilising log-law roughness, a maximum limit for equivalent mannings number is required as the formulation becomes singular at shallow depths.
This limit, provided as the fixed mannings n value in the material data, must be greater than zero.
Suggestions
Ensure that all materials that utilise log-law roughness have positive values for mannings n.
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