A holistic microclimate model

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advanced_settings [2012/08/11 09:30] – created marenlieadvanced_settings [2012/08/11 09:36] – [Turbulence Model] marenlie
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 ===== Flow Model ===== ===== Flow Model =====
  
-Maximum of SOR Iterations+=== Maximum of SOR Iterations === 
 +Number of SOR Iterations in the flow solver. \\ 
 +Should be kept like this but may be adjusted to a smaller number if using the continuous wind field calculation (see [[timing|[TIMING] Section]]).
  
-Number of SOR Iterations in the flow solver. +=== Maximum of Update Steps === 
 +Number of iterations to find a stable wind field.\\ 
 +May be adjusted to a larger number if flow problems occur.\\ 
 +(See also [[kb:flow|Knowledge Base: Flow Problems]]).
  
-Should be kept like this but may be adjusted to a smaller number if using the continuous wind field calculation (see [TIMING] section)+===== Turbulence Model ===== 
 +=== Use Buoyancy Term (Default=Yes) === 
 +Allows to switch off the turbulence production through buoyancy forces.\\ 
 +Might be helpful for certain low wind situations.\\ 
 +**For a wind speed below 0.8 m/s, ENVI-met automatically turns //off// the buoyancy term.**
  
-  +=== Initial Relaxation (Default= 1.0) === 
- +Sets the initial value of the [[relaxation]] coefficient.\\ 
-Maximum of Update Steps +Reduce the value if problems with the TKE-e equation system occur constantly.\\ 
- +See also [[kb:turbulence|Knowledge Base Turbulence Model]].
-Number of iterations to find a stable wind field. +
- +
-May be adjusted to a larger number if flow problems occur. +
- +
-(See also Knowledge Base: Flow Problems) +
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-Turbulence Model +
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-  +
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-Use Buoyancy Term (Default=Yes) +
- +
-Allows to switch off the turbulence production through buoyancy forces. +
- +
-Might be helpful for certain low wind situations. +
- +
-For a wind speed below 0.8 m/s, ENVI-met automatically turns off the buoyancy term. +
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- +
-Initial Relaxation (Default= 1.0) +
- +
-Sets the initial value of the relaxation coefficient. +
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-Reduce the value if problems with the TKE-e equation system occur constantly. +
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-See also Knowledge Base Turbulence +
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-Stationarity Criteria dK/dt (Default=0.010)+
  
 +=== Stationarity Criteria dK/dt (Default=0.010) ===
 Defines the threshold value of Km/dt below which further changes in the results are considered as numerical noise and the calculation is stopped to save time. Defines the threshold value of Km/dt below which further changes in the results are considered as numerical noise and the calculation is stopped to save time.
  
-  +=== Use Intelligent Troubleshooting === 
- +Switches [[relaxation]] mechanism on or off.\\ 
-Use Intelligent Troubleshooting +See also [[kb:turbulence|Knowledge Base Turbulence Model]]. 
- +
-Switches relaxation mechanism on or off +
- +
-See also Knowledge Base Turbulence  +