Time step for wind turbine analysis
 

Hi all,
I am using a unsteady density based implicit solver for simulating the flow around a 50m radius wind turbine blade. The turbine rotates at 14 rpm. I would like to know if there is a specific way by which I could determine the time step size for my simulation. I started off with a low time step size 10^-5 and based on the convergence behavior, I kept increasing the size of the time step to 0.01. how do i know of the most appropriate time step size?
Any help would be greatly appreciated!
Thanks,
aar

Hi Everyone,
I have this doubt too about the automatic timestep (how is it calculated)
and physical time step (how it is calculated) and what is the difference between the physical and auto time scale.
Raashid

You have to give a look at some paper about experimental studies in wind gallery.From these papers you could get info about the Strouhal and from the Strouhal obtain the eddies relase frequency and form that obtain the period (inverse).Then you have to consider a time step about 100 times inferior to that period.

do u have any references for wind turbines?

Try this : http://www.greenenergywindturbine.co...awt/760131.pdf