[quarkz]

Hi, I'm trying to simulate a wing with body tail doing a pitch up motion. Due to the lift of the wing in front of the CG, this will cause the whole wing body tail to pitch up.

Hence, the constraints are:

fixedPoint
    {
                 sixDoFRigidBodyMotionConstraint point;
                 centreOfRotation (0. 0. 0.);
    }


    fixedAxis
    {
                sixDoFRigidBodyMotionConstraint axis;
                axis (0 0 1);
    }

I managed to run for ~ 0.05s, after which the angular velocity gets bigger and bigger and eventually the solution diverged.

I tried a few things as recommended in the forum:

1. changing innerDistance/outerDistance from 0.3/1.0 to 0.5/5.0
2. accelerationRelaxation from 0.6 to 0.3
3. Trying Newmark, CrankNicolson, symplectic

I don't know what else I can do. Any other suggestions?

Thanks.