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advanced_settings [2012/08/11 09:30] – created marenlie | advanced_settings [2012/08/11 09:35] – [Flow 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 | + | ===== Turbulence Model ===== |
+ | === Use Buoyancy Term (Default=Yes) === | ||
+ | Allows | ||
+ | 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: | |
- | 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) | + | |
- | + | ||
- | + | ||
- | + | ||
- | + | ||
- | + | ||
- | 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. | + | |
- | + | ||
- | Reduce the value if problems with the TKE-e equation system occur constantly. | + | |
- | + | ||
- | See also Knowledge Base Turbulence | + | |
- | + | ||
- | + | ||
- | + | ||
- | 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 | |
- | Use Intelligent Troubleshooting | + | See also [[kb: |
- | + | ||
- | Switches relaxation mechanism on or off | + | |
- | + | ||
- | See also Knowledge Base Turbulence | + | |