A holistic microclimate model

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timing [2017/11/10 09:09] (current)
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 +====== [TIMING] Section ======
 +
 +===== Purpose =====
 +The model offers the possibility to change different timing settings for processes that are not calculated for each time step.\\
 +You should not use larger intervals than the default values. ​
 +
 +**ENVI-met will check the time steps and give error messages if problems exists. These errors must be taken seriously.**
 + 
 +<​file>​
 +00: [TIMING___________________Update & Save Intervals
 +01: Update Surface Data each  ? sec             =30.0
 +02: Update Wind and Turbulence each ? sec       =900
 +03: Update Radiation and Shadows each ? sec     =600
 +04: Update Plant Data each ? sec                =600
 +</​file>​
 + 
 +
 +====What do the lines mean?​==== ​
 +
 +=== 01: Update Surface Data (Default 30.0 s)===
 +Re-calculation of surface temperature and humidity.
 + 
 +=== 02: Update Wind and Turbulence (Default: 900 s)===
 +Interval for updating the flow field and the turbulence data (kinetic energy and the exchange coefficient) in the atmosphere.\\
 +Turbulence is only updated, if turbulence mode "​0"​ or "​1"​ is set (see Turbulence Section). If the continuous mode (2) is chosen, turbulence is not updated but calculated all the time.
 +
 +=== Continuous wind calculation NEW ===
 +You can also choose to calculate the wind field for each time step.\\
 +To do this, set update interval to "​0"​. (makes only sense when the turbulence mode is "​2"​)\\
 +However, this will require very small time steps for the flow field and makes the simulation very slow.\\
 +This is a test option to make a tribute to high-end computers from your local supermarket. Not really tested, but should work.
 +
 +=== 03: Update Radiation and Shadows (Default: 600 s) ===
 +Update of  the sun position, the shadows and the radiative fluxes from the sky.
 +
 +=== 04: Update Plant Data (Default: 600 s) ===
 +Recalculation of leaf temperature,​ stomata resistance and other plant parameters. ​