moving pistons with camber angle Fluent model
 

Hi all,
I'm trying to simulate Stirling cooler machine and I need to define two moving pistons in Fluent with 90 deg camber angle.
I made simple Fluent model with moving pistons using in-cylinder option: http://screencast.com/t/XzVZTNE69b (Sorry for quality, it’s just example).
I defined two walls as rigid bodies and defined in-cylinder options.
Unfortunately I can’t define pistons camber angle (if I define starting angle as 90 deg in “in-cylinder” dialog box it affect to both pistons).
I tried playing with “Events…” dialog box but I can’t find right options which cause 90 deg pistons camber angle.
Please help.