Cut Point 1D, Cut Point 2D, and Cut Point 3D
Use a Cut Point 1D (), Cut Point 2D (), or Cut Point 3D () data set to plot and evaluate a value in a certain point along time or along a parametric solution and to create cross-sectional point plots. The choice of 1D, 2D, or 3D only controls the type of input the data set accepts. For example, a Cut Point 1D can only be added to 1D data sets, Cut Point 2D can only be added to 2D data sets, and so forth. Any of these can be used to make a point graph plot along time and so forth.
Add a Cut Point 1D data set for one point as cross-section data. Add a Cut Point 2D or Cut Point 3D data set to, for example, plot the value in a certain point along time or along a parametric solution and use the data set in its original dimension. Useful ways to visualize and display data in cut points are through Point Evaluation nodes () under Derived Values and Point Graph nodes () under 1D Plot Group nodes.
Go to Common Results Node Settings for links to information about the Data section.
Point Data
To specify the point data coordinates using the Entry method list:
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Select Coordinates (the default) to enter the coordinates. For Cut Point 1D, enter an x coordinate; for Cut Point 2D, enter x and y coordinates; and for Cut Point 3D enter x, y, and z coordinates.
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Select From file to enter or browse to a text file with the cut point data. Enter the path and filename in the Filename field, or click Browse to browse to the file. You can use text files (*.txt) or, if the license includes LiveLink™ for Excel®, Microsoft Excel Workbook files (*.xlsx). The file format is such that each line contain N coordinates for an N-dimensional cut point. For text files, you can use any of the following characters to separate the coordinates: space, comma, semicolon, or a tab character. Empty lines and lines that begin with a percent (%) character are ignored.
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Select Grid to enter grid coordinates for gridded data. For Cut Point 1D, enter an x coordinate; for Cut Point 2D, enter x and y coordinates; and for Cut Point 3D, enter x, y, and z coordinates.
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Select Regular grid to specify the number of points in each direction. Enter Number of x points, Number of y points (Cut Point 2D and 3D), and Number of z points (Cut Point 3D only). The default value is 10 points in each direction.
Select the Snap to closest boundary check box to snap the selected points to the closest boundary in the geometry. Use this option when evaluating a variable that is available on boundaries but not in domains. Otherwise, leave the snapping off (the default setting) to avoid the additional computational cost.
Advanced
By default, the Cut Point data sets create a point number variable so that you can refer to that variable in a Point Graph, for example, where you want to plot some quantity at those cut points. The default variable name is typically cpt1n, for the first Cut Point data set. Enter another variable name in the Point number variable field if desired.
For a Cut Point 1D example, and if you have the Plasma Module, see Benchmark Model of a Capacitively Coupled Plasma: Application Library path Plasma_Module/Capacitively_Coupled_Plasmas/ccp_benchmark.
For a Cut Point 2D example, see Steady-State 2D Heat Transfer with Conduction: Application Library path COMSOL_Multiphysics/Heat_Transfer/heat_convection_2d.
For a Cut Point 3D example, and if you have the:
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MEMS Module, see Prestressed Micromirror: Application Library path MEMS_Module/Actuators/micromirror.
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Microfluidics Module, see Star-Shaped Microchannel: Application Library path Microfluidics_Module/Fluid_Flow/star_chip.
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RF Module, see Microwave Oven: Application Library path RF_Module/Microwave_Heating/microwave_oven.