Simulation fails
@Anonymous
Welcome to the community..
Images are not really helpful.. We have no clue what loads you have applied and what your sim settings are. 
In addition your provided a step file and that doesn't help either.
Please provide the file with your settings.
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
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Can you attach your FEA folder?
Gilberto Binga
Engenheiro Mecânico - Engenheiro Mecatrônico
deLearning - YouTube Channel
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Accepted solution
Hi! I guess you are trying to simulate a force pushing the roller on a rail from the side. Two things to consider: 1) You may want to fix or ground the roller. The system may not be stable with only a side force. 2) Try to simplify the wheels faces and the rail faces. I bet there are smaller round faces which can make the contact necessarily complicated.
Many thanks!
Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer