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DOPTPRM, OPTMETH

DOPTPRM, OPTMETH

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DOPTPRM, OPTMETH

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Parameter

Values

Description

OPTMETH

< MFD, SQP, DUAL, DUAL2, BIGOPT >

Default = See description and Note

Options to choose the optimization algorithm:

MFD - Method of feasible directions
SQP - Sequential Quadratic Programming
DUAL - Dual Optimizer based on separable convex approximation.
BIGOPT - Large scale optimization algorithm.
DUAL2 – Version 4 of the Dual Optimizer based on separable convex approximation (Note 2).

The DUAL algorithm should be used for concept level optimization (Topology, free-size and Topography) since such problems typically involve a very large number of design variables.

For size and shape optimization, MFD, SQP (primal methods) and BIGOPT are more suitable since the approximate problem typically involves coupled terms, due to the advanced approximation formulation utilizing intermediate variables and responses. MFD is the default optimizer for size and shape optimization. If Equality Constraints are activated in size and shape optimization, then SQP is the default optimizer.

Note:

1.During a run, the corresponding optimization algorithms are automatically selected by OptiStruct based on the optimization type. The use of this parameter will override the defaults.
2.Version 4 is an improved version of the proprietary CONLIN dual optimizer. Solution stability has been improved, reducing probability of failure in converging to a solution. For legacy reasons, the default CONLIN version remains DUAL. Use DUAL2 if Topology, Free-Size, or Topography optimization fails to converge.