Why doesn't the converged optimization result I obtain contain elements with high density values (0.7 ~ 1.0)?
Some of the most common causes of this result are:
The optimization has not converged. The process has stopped because the optimization has reached the iteration limit. Please increase the iteration limit and restart the run.
A huge design space has been given. This situation is normally found in the area of minimize mass or volume response.
Not enough mass or volume has been given to the design problem. This situation is normally found in a design problem in which the mass or volume response is used as a constraint. Please increase the mass or volume fraction value in the constraint.
In addition, the DISCRETE parameter on the DOPTPRM bulk data entry, found in HyperMesh under opti control in the optimization panel, can be used to increase the penalization factor and force densities to go to either 0 or 1.