Optimizer Parameters

The mathematical optimizer CSA is used to determine the new nodal positions.

This page discusses:

The following parameters might be set:

Move Limit (NODAL_MOVE)

A move limit adjusts the change in the nodal coordinates per iteration. The relative move limit of the node-based optimization displacement for each iteration is set by the optimization parameter.


NODAL_MOVE = <real_value>

Default value is NODAL_MOVE = 0.1. The value must be between 0.0 and 1.0. The absolute move limit is the maximum possible optimization displacement times NODAL_MOVE.

CSA Asymptote Update (NODAL_UPDATE)

The optimization parameter NODAL_UPDATE can be used to control the update of asymptotes in CSA. The value of nodal update might be conservative (NODAL_UPDATE = CONS) which is default or normal (NODAL_UPDATE = NORM).

Important: Only advanced users should change this parameter.

Sensitivity Calculation (ONLY_DES_NODES)

Tosca Structure.bead calculates sensitivities only for design nodes:


ONLY_DES_NODES = YES

In the opposite case (ONLY_DES_NODES = NO), Tosca Structure is forced to calculate sensitivities for ALL_NODES, which is not recommended.

Important: Only advanced users should change this parameter.