I'm running FEA on an adapter with flanges, and I'm getting higher stresses than I think I should.  I've tried redefining the fixtures, and I get different results.  Here are the three scenarios I've tried:

1) Constrain the vertical face of the pilot axially, constrain the cylindrical face pf the pilot radially, constrain the bolt holes radially to prevent rotation.  (This yields the biggest stress)

2) Constrain the vertical face of the pilot axially, constrain the cylindrical face pf the pilot radially and rotationaly.

3) Constrain the vertical face of the pilot axially, constrain the cylindrical face pf the pilot radially, constrain the outer diameter of the flange rotationaly.

Which of these is most accurate?  I feel it should be 1), but I get "hot spots" that way.