Using a Job Configuration to Store Parametric Results on File

As an example of the use of a job configuration, right-click the (

) node and add a Parametric Sweep (Job Configurations) to run a parametric study, storing the model and associated data and plots for each parameter step to individual files. This is useful if you, for example, want to:

•

Store information in individual output files instead of in one large file.

Create a parametric sweep study by right-clicking the study node and adding a . Add the parameters you want to sweep over in Parameters under Global Definitions. Now add the parameters in in the parametric sweep node you created and set the you want to sweep over. In some cases COMSOL Multiphysics chooses to use the more efficient parametric solver when sweeping. Set the under to if you want to avoid this. Use the setting to conserve memory. In that case, use the Accumulated Probe table to store the data you want to use for later processing. You can also choose to store the models on file by enabling the and then entering a filename in the field, or clicking to choose a name and location for the model files. The models created during the simulation can then be found in a node under . The default settings are configurable in the Preferences dialog box.

If you want to create output files with the parametric sweep for further analysis, right-click the main study node and select . Select the parametric node under that corresponds to the parametric sweep from which you want to export data. You can see which parametric sweep the node corresponds to from the list. Note that if you run a stationary study, you need to switch off in the section (see above) to get the node under .

Right-click the node and select to run a node for each parameter value in the sweep. This functionality is similar to probes but is useful if you have already set up a node that you want to use during the sweep. The values are stored in a table (similar to probes) for further processing.

Right-click the node and select if you want to export data to a file for each parameter value in the sweep, running an node under . Note that after the sweep, the files created are listed in the node and can be opened in a browser using the button.

•

Create a parametric job configuration that uses two solvers. The first solver is used as input to the second solver. One way to create such a sweep is to create two studies. Let the second study use the first as input from the . Create a in the first study and select to keep solution. Run in both studies and enter the node of the first study. Right-click the node and add a. Select the new solver and set it to run the second solver from the second study. Also check the settings. Right-click the node and select . You can add further functionality to the sequence such as to suit your needs.

•

Another possibility is to create a parametric sweep that runs a node. This gives you similar functionality as the distributed parametric sweep, but the results are stored in separate files. Note that this requires several licenses, one for each process running simultaneously. One way to create this is to add a node by right-clicking the study. This node creates such a sweep automatically. It also sets up synchronization of solutions and accumulated probe tables when the synchronization is enabled. Another, more complicated, way is to add a node by right-clicking the study. Note that you need the enabled. If you added the node, then run and select the node. Right-click and add a node. Right-click the new node and enable it. Right-click again and add a node. Set the job sequence to point to the node. This sets up the new node to start a new process for each parameter. After you have set the parameters that you want to compute for, right-click and select . The resulting models are stored in nodes under the batch job run by the cluster computing node. To get exported data during the runs, you can use the functionality described above or enable the synchronization of solutions and accumulated probe tables in the node.

•

Create a parametric sweep that runs a solver and a class file that uses the COMSOL API to modify the solution. This can be useful if you want COMSOL Multiphysics to communicate with another program. You do this by adding a node to the study that you want to use. Run and enter the s node. Right-click the node and select . You can also modify the node by, for example, adding a .