) 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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) and navigate to where you want to Save the output. You can also click the downward arrow beside the Browse button and choose Browse From (
) to open the fullscreen Select File window. For example, navigate to the desktop and enter a Filename in the Export Data window. When you have chosen Text from the File type list, you can save the data using any of the supported text file types that you choose from the Save as type list. Click the downward arrow for the Location menu (
) to choose Copy Location (
) and (if you have copied a file location) Paste Location (
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The Include header is selected by default. Click to clear the Include header check box if you do not want to include a header. When exporting to VTK files, the Include header check box is not available.
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The Full precision check boxes is selected by default. Click to clear the Full precision check box 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).
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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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By default, the data included data points whose values are NaN (Not a Number). Clear the Include NaN data points to exclude such data points from the data export. NaN values represent data that is missing, undefined, or unrepresentable, such as the result of zero divided by zero.
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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 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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Select a column separator from the Separator list: Column (the default), Space, Tab, Comma, Semicolon, Colon, or Vertical bar (pipe).
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) in the Settings window or right-click the node and select Export. You can also click the downward arrow beside the Export button or right-click and choose Export To (
) to open the fullscreen Export window for exporting to a database. The Messages window confirms where the files are exported as specified in the Output section.
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