can you post some pictures of your model?
also posting a report from your analysis would be good. that will show us more info about the setup.
if you havent' done so already, i'd suggest taking a look at the tutorial on mesh optimization, it has something similar to that.
but really this problem should be simple to setup. put the airfoil in an external flow analysis and then add a volume flow rate out on a face.
you'll have to elaborate on what "nothing happens" means and also what you mean by "wind flow stopped running".
posting your model would be probably the easiest thing to do but if you can't. just create a plate, setup the problem similarly and see if the problem still exists. that will also tell you if the problem is part/model/setup specific.
There was a paper published very recently on modeling synthetic jet using FloEFD (which is almost exactly same as SW Flow Sim). It describes the models, BCs in detail. Synthetic Jet is a highly transient, pulsed flow and requires you to construct the mesh carefully. Adaptive refinement will help.
Hope this helps.
can you post a link?
It's available on IEEE. I have the paper but I of course can't share it.
You can also search last month's Q pedia magazine, they have reviewed this paper.
...I don't know how detailed you want your study but I have seen LES is typically used to study synjet BL regime. Obviously SW doesn't have an LES solver. Here is the title of the paper I was referring to:
Practical CFD Modeling of Synthetic Air Jets for Thermal Management of Electronics