Getting Started Writing FVX Scripts

How can I get started with writing FVX scripts? We recommend you start with the GuideFVX file (.fvx) which is created as part of your “complete restart”.  For any visualization you make, the File.. Save Restart.. Complete option will also create an FVX example, known as Guide FVX, which when run, will closely replicate your visualization, with minor limitations. Our installation also provides ./demo/aerospace_LDM.fvx which you can run and explore. […]

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Memory Usage with Vector Display Type

When using the Vectors Display Type, it appears that an excessive amount of memory is used, and FieldView performance gets very slow. How can I improve this? There is a known issue where 2D vectors heads can be very slow to render. Please change the Vector Head to Type: 3D, and you should see an obvious improvement.

Setting FieldView Default Directory

I would like to have FieldView default to my current working directory when browsing for Data Input files, restarts, etc., but the last used directory seems to be the default. Can this be changed? Some users prefer the current working directory to be the default, so we have made this possible by allowing you to set the environment variable FV_OLD_BROWSER_BEHAVIOR=1.

How to Read Tecplot into FieldView

How can I read Tecplot format data into FV? Binary Tecplot format files are among the data types which can be read using the GENERIC Unstructured..& Data Input option. If you have ascii format Tecplot files, you will need to use a converter to make a binary file.

Calculating Mass-Weighted Average

How do I calculate the mass-weighted average of a scalar through a surface? Mass weighted average can be obtained from the combined use of the function editor and two separate integrations. The mass weighted average is usually defined as: Thus, it can be computed by dividing the summation of the value of the selected variable multiplied by the absolute value of the dot product of the facet area and momentum […]

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Visualizing Turbulent Flow Features Using Surfaces

How can I visualize turbulence and flow features using surfaces? The Q criterion, introduced by Hunt et al. in 1988, is commonly used to identify regions of recirculation in flow fields. As of FieldView version 17, Q-criterion is a built-in function available on the Function Calculator, increasing peformance as compared to using this function via feature_detection_formulas.frm available with previous versions of FieldView, explained below. Q-criterion provided with earlier versions of […]

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Using the Plot3D Reader

I’ve used the PLOT3D reader in a FieldView version prior to 12.3 to read my overflow-2 data. Are restarts created in that version compatible with version 12.3? Yes, but don’t try editing FVX scripts (.fvx) or data restarts (.dat) to change the data reader name from plot3d to overflow-2 and expect it to work properly, since some derived function names have been changed, (eg. ‘Pressure [PLOT3D]’ vs. ‘Pressure [OVERFLOW]’). Constants […]

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Restricting Streamlines to a Surface

How can streamlines be restricted to a surface? You can seed the target surface, and integrate streamlines for a new (modified) velocity field you have created using the Function Formula Specification Panel. For instance, if you have a plane (flat surface), let N=(N1,N2,N3) be the (constant) normal to the surface: N = nrmlz (N1*UnitX + N2*UnitY + N3*UnitZ) where “nrmlz” makes sure this is a unit normal (length 1). Let […]

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Overflow-2 Scalar Values Misplaced

My overflow-2 data doesn’t look correct in FieldView. All the scalar values seem misplaced. What could be wrong? There is a known issue with overflow brkset files in FieldView, where some brkset formats are not correctly recognized. Removing or hiding the brkset files will allow the data to be read and post-processed accurately.