This is not nice at all, but for some reason (possibly time scale) the old force values are much too high and cause the solver to become unstable. These will be revisited later anyway, so for now such scaling should be fine.
This is not nice at all, but for some reason (possibly time scale) the old force values are much too high and cause the solver to become unstable. These will be revisited later anyway, so for now such scaling should be fine.