...
Therefore, an already optimised STL-file is needed as a Start Space. This can be exported directly from the post processing and be selected as a Start Space by clicking on the browse button. Therefore, the unit of the exported STL-file needs to be in meters (SI-Units). In most cases the Strut Density and Shape Quality settings must be changed as well using the Advanced User Settings. For a restart the same resolution level and number of to be completed iterations have to be filled in. You can find a Tutorial to how to perform a Restart here.
Advanced User Settings Commands for a Restart with Start Space:
...
schedule.startCandidate.candidate=<restart-file.stl>
geometry.startCandidate.path=<restart-file.stl>
...
Specifies the Restart/Start Space file.
Provides the information for the correct path to the Restart/Start Space file.
Please enter the file name for <restart-file.stl>
This way a two-stage optimisation is also possible. For a two-stage optimisation the resolution level and number of iterations must be chosen wisely and will need some fine tuning.
A Start Space can be marked as a Non-Design Space, thus the Start Space cannot be removed during the optimisation and will be part of the final design. Therefore, the following command need to be added as well:
geometry.StartCandidate.path = StartCandidate.stl |
Activate Automatic Non-Design Growth
All areas applied with a boundary condition are automatically Interfaces. With an Interface the surface will grow a little bit beyond the Design Space boundaries to ensure a trouble-free and clean intersection. It is also possible to detect all Non-Design Space surfaces which are at the same time Design Space limits and let them grow automatically. This option results in a different connection between the Design Space and the Non-Design Spaces/Interfaces. Both results can be viewed here.
If the connection of the automatic Non-Design Growth is preferred, it can be activated with the following command:
...
Sometimes this can lead to issues which are described here.
...
Soft Symmetry
The soft symmetry is activated per default. It influences the design generation so that the part is symmetric in all three dimensions if they were symmetric in the respective dimension to begin with. This is achieved for geometrical symmetrical design spaces even without symmetric LBCs and the hard symmetry constraint.
...
This governs how far the optimization value of two symmetric elements is allowed to differ while still being considered equivalent. In theory any value works: the higher the value the more zealously the algorithm will try to keep Soft Symmetry, possibly degrading the quality of the produced geometry compared to a non-symmetric one. The default value is 1e-64.
Attempt Soft Symmetry:
Whether or not Soft Symmetry is attempted at all can be (de)activated here.
...
configuration.equivalenceDelta = 1e-64 configuration.attemptSoftSymmetry = dynamic configuration.softSymmetryThreshold = 0 |
|---|