Parametric Sweep (Job Configurations)
One of the main nodes is the Parametric Sweep () job configuration, which can loop over a given set of parameters. For each set of parameters, it runs the sequence defined by its subnodes. You can combine the sequence with other Batch, Parametric, or Cluster Computing sequences in a hierarchical way by adding a job configuration that points to another node. You can, for instance, create a Parametric Sweep node that does a LiveLink™ update and then runs a Cluster Computing node that in turn runs a second Parametric Sweep sequence on another node.
A parametric sweep can contains steps to run all solutions, save the model to a file, and evaluate derived values, for example. You add those steps by right-clicking the Parametric Sweep node and selecting one of the following options:
Job
Solution
Other
Save Model to File, which saves the solved model to an MPH-file. See Save Model to File.
Results
Job refers to another job that is to be run from this parametric sweep, while Solution (see Solution) runs a Solution node as available under the Solver Configurations node, available further up in the Study tree.
Under Other, you can choose External Class (see External Class), which calls an external Java® class file. Another option, Method Call (see Method Call), runs a model method. The Geometry (see Geometry), builds the Geometry node (runs the geometry sequence). This can be used, for example, in combination with a parametric sweep to generate a sequence of MPH-files with different geometry parameters. The Mesh option (see Mesh) builds the Mesh node (runs the meshing sequence).
Under Results, you can choose Plot Group (see Plot Group) to run all or a selected set of plot groups. This is useful for automating the generation of plot groups after solving. The Derived Value option is there for legacy reason, and it is instead recommended that you use the Evaluate Derived Values option (see Evaluate Derived Value), which evaluates nodes under Results>Derived Values. The option Export to File (see Export to File) runs any node for data export under the Export node.
General
Use the Defined by study step list to specify that the settings are synchronized with the corresponding study step.
You define the parameters in the Parameter name and Parameter values fields. The parameters can be loaded from file by clicking the Read File button when you have selected the file through the Load Parameter Values dialog box, which you open by clicking Browse. You can add a Stop condition that is evaluated after each solution. The last solution, which breaks the stop condition, is discarded from the set of solutions returned (the Parametric Solutions node) but is included in probe table outputs. Once the condition evaluates to a negative value, the Parametric node is stopped. Select the Keep solutions before and after stop condition check box to store both solutions — before and after the stop condition has been satisfied — in the parametric solutions storage.
Results While Solving
Select the Plot check box to allow plotting of results while solving. Select what to plot and when from the Plot group list. The dataset of the selected plot group is plotted as soon as the results become available.
Use the Probes list to select any probes to evaluate. Use the Accumulated probe table to accumulate data during a sweep. The accumulation is over solver variations (time, frequency, and so forth) and variations over the parametric sweep. For independent variation of parameters, you can use the accumulated table with the Format: Filled to change the table data into a matrix format that can be used for response surface plots.
Error
Errors are usually stored in the Error table. If you want to get the error message at once, select the Stop if error check box.
Cluster Settings
You can distribute the sweep on several computational nodes by selecting the Distribute parameters check box. If the problem is too large to run on a single node, enable the Maximum number of groups field to use the nodes’ memory more efficiently. In this case, the same parameter is solved for by several nodes that cooperate as if running a nondistributed sweep. The number of nodes that cooperate is equal to the maximum of the total number of nodes divided by the Maximum number of groups setting and 1. So if the total number of nodes is 12 and the Maximum number of groups is 3, 3 groups with 4 nodes each cooperate.
Log
Select the Keep warnings in stored log check box as needed.
An Integro-Partial Differential Equation: Application Library path COMSOL_Multiphysics/Equation_Based/integro_partial.