Difference between revisions of "TUFLOW Message 3008"

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{{TUFLOW_Message
 
{{TUFLOW_Message
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|tuflow_message=ERROR 3008: nut_m must be >= 0. <br>
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|tuflow_message=ERROR 3008 - tau0 must be >= 0.
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ERROR 3008: nut_c must be >= 0
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|alt_msg=ERROR 3008 - muLow must be >= 0.<br>
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<br>  
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ERROR 3008 - muHigh must be >= <number>.
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|alt_msg=
 
 
|type=[[ERROR]]  
 
|type=[[ERROR]]  
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|message_desc=''SMAGORINSKY turbulence model:''<br>
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|message_desc=For the non-Newtonian viscosity formulation both tau0 and muLow cannot be negative. Further, the upper limit muHigh cannot be less than muLow.
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When SMAGORINSKY turbulence model is used, ''nut_m'' is the Smagorinsky coefficient and ''nut_c'' is a constant eddy viscosity component. These two parameter must be >=0.<br><br>
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|suggestions=Ensure the supplied viscosity coefficients are correct.  
  
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''PRANDTL turbulence model:''<br>
 
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If the PRANDTL turbulence model is selected, the viscosity is modelled based on the turbulence length scale ''l'' and the turbulence intensity ''k'' as follows:<br>
 
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[[File:PRANDTL.png | 150px]]
 
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<br>
 
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where ''Cc (nut_c)'' is a constant component of the viscosity, and the maximum value of ''l'' is limited by ''Cm * depth'', where ''Cm (nut_m)'' is a coefficient to define the turbulence length scale.
 
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|suggestions=Make sure the parameters specified by the <font color="blue"><tt>Viscosity Coefficients </tt></font> <font color="red"><tt>== </tt></font> command is larger than zero.
 
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|discussion_page=* [[Talk:TUFLOW Message 3008|Discuss Message 3008]]
 
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|link3=''
 
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|link4=''
 
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|prelink=[[TUFLOW_Message_3007|Message 3007]]
 
 
|uplink=[[3xxx_TUFLOW_Messages|3xxx Messages]]
 
|uplink=[[3xxx_TUFLOW_Messages|3xxx Messages]]
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|nextlink=[[TUFLOW_Message_3009|Message 3009]]
 
 
}}
 
}}

Latest revision as of 10:10, 3 March 2023

TUFLOW Message
ERROR 3008 - tau0 must be >= 0.

Alternate Message
ERROR 3008 - muLow must be >= 0.
ERROR 3008 - muHigh must be >= <number>.

Message Type
ERROR

Description
For the non-Newtonian viscosity formulation both tau0 and muLow cannot be negative. Further, the upper limit muHigh cannot be less than muLow.

Suggestions
Ensure the supplied viscosity coefficients are correct.


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