Hey,
sorry, i dont have any experince in calculating the “right” wall distance for a turbulence modell.
I would like to ask, if the results could be correct.
Initital values:
rh = L = 0,12\:m \\
U = 1,025\:m/s \\
\rho = 999,1\:kg/m³\\
\mu = 0,00114\:kg/m\cdot s \\
y+ = 30
Reynoldsnumber:
Re =(\rho \cdot U \cdot L) / \mu = ( 999,1 \cdot 1,025 \cdot 0,12)/0,00114 = 104.324
Cf:
Cf = (2\cdot \log_{10}(Re)-0,65)^{-2,3} = 0,0058
tau wall:
\tau_{wall}= (1/2) \cdot C_{f} * \rho \cdot U^{2} = (1/2) * 0,0058 \cdot 999,1 \cdot 1,025^{2} = 3,043 kg/(m\cdots^{2})
Ufric
U_{fric} = \sqrt{\tau_{wall} / \rho} = \sqrt{ 3,043 / 999,1 } = 0,0552
y:
y= (y+ \cdot \mu) /( U_{fric} \cdot \rho) = (30 * 0,00114)/(0,00552 \cdot 999,1) = 0,00062\:m\\
1st\:Cellheight\: 2\cdot y = 0,00124\:m
So the first cell has to be 1,24 mm height, would you say ok, that could be, or did it feel way to small ?
I’d like to settle this before I create the mesh and consume many core hours in simulations 
.
Best regards
Kai
) , I was just trying to make sure that people who use this topic for future reference will not miss it 
Keep up the good work and communication guys, appreciate it! And props to 
and to check my results 
