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The Start space for a Restart must be a STL-file. Therefore, a already optimized geometry can be exported in the Post Processing. In this case iteration 22 from the symmetrical Bridge Bookshelf will be used.
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Attention: The STL-file for the Restart must be exported in SI-Units (Meters).
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After adding these commands to the Advanced User Settings the optimization can be started. The first iteration of the restarted optimization will be the imported Start space.
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Two-stage optimization
A second possibility is to perform a two-stage optimization. Instead of a simple restart with the same optimization parameters the parameters can be varied.
ExampelsExamples:
Skipping the coarse resolution level and calculate directly on the finest resolution level with an early iteration from a former optimization, if a very fine high-resolution level is desired
Vary the value for the stress goal to keep the overall geometry with more or less material
Modify an optimization output (remove or add struts) and restart with this modified geometry
Creation of a lattice structure of an optimization output and restart to optimize the lattice
A two-stage optimization is useful for the following applications:
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An optimization by means of a grid structure is to follow. See tutorial ...
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A very fine high-resolution structure is desired. Then it is advisable to first perform an optimization up to a reduced structure (the optimization must not be finished). Then a second optimization with a start design is performed, which starts directly at a higher resolution level and receives more iterations in these levels to form the fine structure.
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