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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>Restrictions (DVCON_SHAPE)</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1"><p class = "header"><p class = "abstract">
<span class = "shortdesc">For shape optimization, restrictions are defined as boundary conditions that limit the potential area of the node displacement.
A design variable constraint is a restriction that directly affects the individual design variables, here, the individual design nodes.
Since the nodes in the mesh smoothing area can be interpreted as second order design nodes, there is also the possibility to apply the
restrictions (up to a limited degree) to the nodes of the mesh smoothing area. Compared to geometrical optimization based on a few parameters,
<span class = "ph">Tosca Structure.shape</span>
allows every design node to be displaced ‘independently’ from other design nodes. </span>

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</p><hr class = "header"/></td></tr><tr><td class = "Intro2"><span class = "run-in">In this section:</span><br/><ul class = "ulthemes"><li><a title = "For shape optimization, restrictions are defined as boundary conditions that limit the potential area of the node displacement. A design variable constraint is a restriction that directly affects the individual design variables, here, the individual design nodes. Since the nodes in the mesh smoothing area (see MESH_SMOOTH) can be interpreted as second order design nodes, there is also the possibility to apply the restrictions (to a limited degree) to the nodes of the mesh smoothing area. Compared to geometrical optimization based on a few parameters, Tosca Structure.shape allows every design node to be displaced ‘independently’ from other design nodes." href = "tso-c-usr-shape-desArea-dvcOvw.htm">Restrictions (DVCON_SHAPE) Overview</a></li><li><a title = "Use the design variable constraints CHECK_GROW and CHECK_SHRINK to apply a box constraint on the design variables." href = "tso-c-usr-shape-desArea-dvcCheck.htm">Restricting the Amount of Displacement (CHECK_GROW / CHECK_SHRINK)</a></li><li><a title = "In Tosca Structure.shape, the displacement direction of the design nodes (optimization displacement vector) is normally determined as the surface normal. The inner nodes are subsequently recalculated in relation to the displacement of the design nodes determined by the selected mesh smoothing algorithm. However, to meet functional and manufacturing requirements it is often necessary to deviate from the automatically determined displacement direction for design nodes as well as for mesh smoothing nodes." href = "tso-c-usr-shape-desArea-dvcCheckBcDof.htm">Restricting Displacement Directions</a></li><li><a title = "A parameter-free optimization is performed for shape optimization in SIMULIA Tosca Structure, that is, each of the design nodes can be moved independent of the other design nodes. However, in some cases certain restrictions are specified that make it necessary to link or couple design nodes. The design nodes are then no longer allowed to move freely; there is an interdependent relationship between the individual design nodes. This relationship is defined by a link condition." href = "tso-c-usr-shape-desArea-dvcCheckLink.htm">Assigning Link/Coupling Conditions (CHECK_LINK)</a></li><li><a title = "Use one of the restrictions presented here to prevent parts of the model from penetrating certain areas." href = "tso-c-usr-shape-desArea-dvcCheckP.htm">Penetration Checks</a></li><li><a title = "Element surfaces can be defined as slide surfaces in order to force the design nodes onto this contour. This option offers more flexibility than restricting the direction of displacement." href = "tso-c-usr-shape-desArea-dvcCheckSlide.htm">Restricting Displacement to a Slide Surface</a></li><li><a title = "Use a design variable filter to control the smoothness of design nodes." href = "tso-c-usr-shape-desArea-dvcFilter.htm">Filter Restriction (CHECK_TYPE=FILTER)</a></li><li><a title = "Use the maximum and minimum member size restrictions to prevent parts of the model from becoming too thick or too thin." href = "tso-c-usr-shape-desArea-dvcMem.htm">Minimum or Maximum Member Size</a></li><li><a title = "Use the transition zone manufacturing constraint to gain a smoother transition from design area to nondesign area." href = "tso-c-usr-shape-desArea-dvcTransition.htm">Transition Zone</a></li></ul></td></tr></table></td></tr></table>



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