openFoam wisdom

Specify velocity AND pressure at a boundary and expect continuity errors.  Set zero gradient (not non-zero gradient) and velocity.

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Calculate initial k and epsilon values with this script:

#!/bin/sh 
echo ' ===========================================' 
echo ' give me Uref, Turbulent Intensity and L' 
echo ' I will give you TKE and epsilon for inlet' 
echo ' ===========================================' 
### 
Uref=$1 
ti=$2 
L=$3 
tke=$(echo "scale=4;1.5 *($Uref * $ti)^2"|bc -l ) 
epsilon=$(echo "scale=4;0.09^(3/4)*$tke^(3/2)/$L"|bc -l) 
echo 'tke =' $tke 
echo 'eps =' $epsilon 

(matejfor, http://www.cfd-online.com/Forums/openfoam-solving/57839-simplefoam-time-step-continuity-errors.html)

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