[TURBULENCE] Section

Purpose

This section interacts with the internal turbulence model. ENVI-met allows you to select between the prognostic 1.5order E-Epsilon closure model (default) and the diagnostic 1st order mixing length model.

Problems with the E-Epsilon model from former versions are mainly resolved, so that the usage of the 1.5order closure model is highly recommended.

In Version 2.5, the “update” scheme for calculating the turbulence was the default setting. In Version 3.1 the continuous calculation is standard. This is due to the increased computer resources between the release of the versions that now allows to use the more accurate continuous mode. ENVI-met does no longer support the old “Update” method!

00: [TURBULENCE]_____________Options Turbulence Models
01: Turbulence Closure ABL (0:diagn.,1:prognos.)   =1
02: Turbulence Closure 3D Model (0,1 see above)    =1
03: Upper Boundary for e-epsilon (0:clsd.,1:op.)   =0

What do the lines mean?

01:Turbulence Closure ABL (Default 1)

Select the turbulence closure for the 1D reference model. You can use the mixing length model here (Mode 0, diagnostic) and the E-e model (Mode 1, prognostic) for the main model.
Usage of the prognostic model is recommended.

02: Turbulence Closure 3D Model (Default 1)

In Mode 0 ENVI-met uses the old Mixing-Length model to calculate the turbulence.
This mode is supported for rather academical reasons.
In Mode 1 the turbulence is calculated using 1.5order E-Epsilon closure model continuously together with temperature and humidity in the main loop of the model.
(This mode was know as mode “2” in prior versions including 3.1 Beta and is still recognized by this version)

03: Upper Boundary for e-epsilon (Default 0 )

Selects between an open (zero gradient) and a closed (fixed value) upper boundary at the top of the 3D Model.
Normally this needs no adjustment.

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