) to export numerical data to a file. Data export operates directly on datasets. You can use different types of evaluation points other than the ones in the dataset (for example, a grid) and export the data in spreadsheet or sectionwise formats.) to export numerical data to a file. Data export operates directly on datasets. You can use different types of evaluation points other than the ones in the dataset (for example, a grid) and export the data in spreadsheet or sectionwise formats.
) and select Data (
), or right-click any dataset node, for example, Solution, and select Add Data to Export. Click the Data node under Export.
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The Include header and Full precision check boxes are selected by default. Click to clear the check box if you do not want to include a header, or to limit the precision in the output to six significant figures (and which provides an output that contains all significant figures for data stored as double-precision numbers). When exporting to VTK files, the Include header check box is not available.
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By default the data is unsorted. Select the Sort check box to sort the data by increasing x, y, and z coordinates.
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From the If the file exists list, select Overwrite (the default) to replace the data in the file with the data you export, or choose Append to append the data to the end of the file. Appending data can be useful when exporting data for a parametric sweep, for example. When exporting to VTK files, the If the file exists list is not available.
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The Evaluate in list is only available for data from Solution datasets. From the Evaluate in list, select Lagrange points (the default) or Gauss points to specify where COMSOL Multiphysics evaluates the data — the nodes of the Lagrange elements or in the Gauss points for the Gaussian quadrature, respectively.
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Smoothing of the data is available with Solution datasets where the Evaluation in list is set to Lagrange points and with nonsolution datasets, in both cases when the Points to evaluate in list in the Output section is set to Take from dataset. Select a data Smoothing method — None, Inside material domains (the default, for smoothing within domains shared by the same material but not across material boundaries), Inside geometry domains (for smoothing within each geometry domain but not across interior boundaries), Everywhere, or Expression. If you choose Expression, enter an expression in the Expression field such that smoothing occurs where the expression is continuous. The default expression is dom, the domain variable, which is equivalent to the Internal smoothing. You can also — in a surface plot, for example — use material.domain, which is an indicator variable for domains that share the same material (see Material Group Indicator Variables) and is equivalent to the Inside material domains setting.
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For all Smoothing methods except None, you can also choose smoothing threshold, if needed. From the Smoothing threshold list, select None (the default), or select Manual to enter a relative smoothing threshold value (default: 0.1) in the Threshold field.
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Select a Resolution: Normal (default), Finer, Fine, or Custom. If Custom is selected, enter a Lagrange-element node-point order (the default is 1). Use a higher node-point order for a finer resolution.
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Select a recovery setting from the Recover list. The default is Off because recovery takes processing time. To use polynomial-preserving recovery and recover fields with derivatives such as stresses or fluxes with a higher theoretical convergence than smoothing, from the Recover list, select Within domains to perform recovery inside domains or Everywhere to apply recovery to all domain boundaries.
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) in the Settings window or right-click the node and select Export. The Messages window confirms where the files are exported as specified in the Output section.
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