Smart Sweep Settings Reference

The following properties and right-click actions are available for the Smart Sweep Settings node when the Study Type is set to Smart Sweep in Design Manager.

Smart Sweep Settings Properties

For a Smart Sweep, a search path indicates a sweep series—several design runs with fixed input parameter values.

Reuse designs within search: When activated, the current design reuses the converged solution from the previous successful design run of this sweep series to achieve a better converged solution.
Reuse designs across search: When activated, the first design of the current sweep series reuses the first design solution from the previous sweep. In the case of an unsuccessful first design, Design Manager searches further for the next successful first design in downstream sweeps.

Note

Reusing the solutions from the previous designs might slow down a smart sweep study. If Reuse designs within search is activated, the designs within a sweep run serial (one after the other). If Reuse designs across search is activated, the first design of the 2nd sweep can start immediately when the first design of the 1st sweep is complete. This behavior is only possible if licenses permit.

To achieve a fast convergence, turbo-machinery simulations often require as an initial flow field a converged solution obtained under similar operating conditions. For other applications, it might be more efficient when all the designs run in parallel.

Stepping Parameter Properties

Study Parameter

Specifies the parameter used to define the step size between design runs within the same sweep.

[stepping parameter] Properties

Step Size: Specifies the step size of the selected parameter.

Bisect Criteria Right-Click Actions

Bisect criteria are the user-specified criteria based on design responses that Design Manager uses to reduce the size of sweep stepping. When met, the step size within a sweep series is halved continuously for each further design run until the stopping criteria of this sweep are fulfilled.

The bisect criteria are useful in generating more design runs as the sweep approaches a critical design point.

Create New Criterion: Opens a Response Criterion child node to define a bisect criterion with respect to a selected response.

Response Criterion Properties

Each [response criterion] underneath the Bisect Criteria node has the following properties:

Study Response

Specifies the response for which this criterion is applied.

Criterion Option

Specifies one of the following options for this criterion:

Minimum: Specifies that the bisect begins when the response value is less than or equal to this minimum value.
Maximum: Specifies that the bisect begins when the response value is greater than or equal to this maximum value.
Percentage Change: Specifies a Percentage Change value with respect to the minimum value or maximum value from the previous design.
For a positive percentage change, the criterion returns true when the percentage increase from the previous minimum design value exceeds this value.
For a negative percentage change, the criterion returns true when the percentage drop from the previous maximum design value exceeds this value.
For example, the value -5 means that bisecting starts when the percentage change with respect to the peak (maximum) value of the previous design drops below 5%.

Logical Rule

When multiple stopping criteria are present, defines the logical relationship of a criterion with respect to the other stopping criteria.

Logical rules are used to determine how all the criteria interact as a group. If a criterion is assigned an OR logical rule, the bisecting starts as long as this criterion is satisfied.

Bisecting starts also when all the criteria assigned the AND logical rule are satisfied. By default all criteria are assigned the OR logical rule.

Stopping Criteria Right-Click Actions

Stopping criteria are the user-specified criteria to end the smart sweep study.

New

Creates one of the following criteria:

Error Designs Criterion
Max Designs Criterion
Parameter Criterion
Response Criterion
Step Size Criterion

Stopping Criterion Properties

Depending on the [stopping criterion] type, you set up the associated properties:

Error Designs Criterion

Stops design study if a certain number of design runs are consecutively with errors. Set the following properties of the Error Designs Criterion child node:

Consecutive Error Designs: Specifies the number of failed consecutive design runs that trigger this stopping criterion.
Logical Rule: When multiple stopping criteria are present, defines the logical relationship of a criterion with respect to the other stopping criteria.

Max Designs Criterion

Stops the design study if the specified maximum number of designs is reached. Available properties:

Max Number Designs: Specifies the maximum number of designs for the study.

Parameter Criterion

Stops design study if an input parameter exceeds the specified limit. Set the following properties on the Parameter Criterion child node:

Study Parameter: Selects the input parameter for this stopping criterion.
Criterion Option: Specifies a criterion option. The options are the same as those for the bisect criterion. See: Bisect: Criterion Option.

Response Criterion

Stops design study if a response exceeds the specified limit. Set the following properties on the Response Criterion child node:

Study Response: Selects the response for this stopping criterion.
Criterion Option: Specifies an criterion option. The options are the same as those for the bisect criterion. See: Bisect: Criterion Option.

Step Size Criterion

Stops design study by setting a criterion option for the Stepping Parameter of the smart sweep design. See also: Stepping Parameter of a Smart Sweep Study. Set the following properties on the Step Size Criterion child node:

Stepping Parameter

Displays the stepping parameter used in the smart sweep design. Read only.

Criterion Option

Specifies one of the following options:

Number of Bisects: Specifies the executed number of bisects. The smart sweep design stops if the value is exceeded.
Absolute Minimum: Specifies the Absolute Minimum Limit of the selected [stepping parameter]. The smart sweep design stops if the absolute value of the parameter is less than or equal to this value.