Length scale control for structural optimization by level sets

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On filter boundary conditions in topology optimization (2017, background): “Local length scale control has also recently been suggested for the level-set approach (Allaire et al, 2016; Wang et al, 2016).”
Undercut and overhang angle control in topology optimization: A density gradient based integral approach (2017, background): “Substantial work has been done in controlling the minimal thickness of topology optimized features [18, 19, 20, 21, 22] and maximal length scale [23, 24, 25].”
Design of graded lattice structure with optimized mesostructures for additive manufacturing (2018, background): “An alternative design strategy to control the minimum width is to impose a size constraint when designing the basic mesostructure (referred to [38]-[40]).”