Difference between revisions of "TUFLOW Message 3027"

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(Created page with "{{TUFLOW_Message |tuflow_message=ERROR 3027: Roughness height specified but nLim less than 0. <br> |alt_msg=None |type=ERROR |message_desc=The limiting Manning’s n va...")
 
 
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{{TUFLOW_Message
 
{{TUFLOW_Message
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|tuflow_message=ERROR 3027: Roughness height specified but nLim less than 0.
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|tuflow_message=ERROR 3027 - Roughness height specified but nLim less than 0.
 
<br>  
 
<br>  
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|alt_msg=None
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|alt_msg=NA<br>
  
 
|type=[[ERROR]]  
 
|type=[[ERROR]]  
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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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|message_desc=Materials may use use either fixed mannings, depth-varying mannings, or log-law roughness formulations for bed resistance.
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|suggestions=A limiting Manning’s n value based on the n value that would normally be applied is also specified to transition to conventional n values at greater depths.
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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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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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|discussion_page=* [[Talk:TUFLOW Message 3027|Discuss Message 3027]]
 
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|link3=''
 
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|link4=''
 
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|prelink=[[TUFLOW_Message_3026|Message 3026]]
 
 
|uplink=[[3xxx_TUFLOW_Messages|3xxx Messages]]
 
|uplink=[[3xxx_TUFLOW_Messages|3xxx Messages]]
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|nextlink=[[TUFLOW_Message_3028|Message 3028]]
 
 
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Latest revision as of 10:15, 3 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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