Hello guys. I've been working on this curvey intake manifold plenum for a while. I've got it done at the moment (see pics) but the problem I'm having is that I am trying to optimize it in CFD, and I can't adjust it at all without it crashing and not rebuilding. I used a fill surface on this boot portion, and it worked perfectly, but it's right on the borderline of not working. If I tilt the outlet 5 degrees, it won't work, move it up or down an eigth inch, it doesn't want to work.

Anybody have a suggestion on an alternate / more rebuild friendly way to do this?

The other problem is that I have to thicken this .1875", and even if the fill rebuilds, a lot of times the thicken will not work.

Pete