Using Data Skip to Approximate and Render a Large Dataset

Question: I am running out of memory rendering my fine-mesh data. How do I read-in a smaller, decimated version of my ordered dataset into my layout? More details: If you are working on a computer with limited resources, some processes can surpass the available computer memory. If you are unable to add more RAM, this can cause Tecplot to slow or, at worst, crash. Try this solution if some actions […]

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Changing a Contour Legend Variable Name

Question: How do I change the name of a variable in the contour legend box? See Figure 1. Solution: Renaming a contour variable requires altering the variable name in the Data Set Information dialog box: 1) In Tecplot 360, go to Data>Data Set Info… (see Figure 2). 2) Double-click the name of the variable displayed in the contour legend and replace it with the desired name. Voilà, the contour legend […]

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Calculating Grid K Normal Nodal Values

Question: The symmetry of nodal Grid K Unit Normal values differ from the comparable cell-centered values (see Figure 1). How are nodal Grid K Unit Normal values calculated?1 Explaining the Question: In Figure 1, at nodes 1, 6, 11, 16, and 21 the X Grid K Unit Normal vectors are equal. However, on the data row below it (nodes 2, 7, 12, 17, and 22), the components of the X […]

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How to Trim Triangulations

Question: How do I prevent the triangulation feature from spanning concave regions of my plot with triangles? Solution: Extracted polylines can be used as boundary zones to limit the triangulation. In particular, these polylines can be used to prevent triangles from spanning concave regions during 2D triangulations. The following procedure utilizes these polylines to trim a triangulation of unorganized data to the desired shape: 1) Load the data to be […]

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Weighted versus Arithmetic Averages and Tecplot

Question: Why is there a difference in Tecplot’s integration average results and the average, or mean, I am calculating over all the data values? Example:  I have nodal data and I want to calculate average U velocity on the following domain (see Figure 1). When I use the integration average feature (Analyze>Perform Integration…>Average>U), I calculate 38.90 m/s. But when I calculate the average over all the nodal U values in […]

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Creating Streamtraces on a No-slip Boundary Surface with Multiple Surrounding Volume Zones

Problem: How do I create streamtraces on a no-slip boundary surface with multiple surrounding volume zones? In more detail: In the User’s Manual in the section titled “Surface Streamtraces on No-slip Boundaries”, it describes how to create these surface streamtraces in the context of an ASCII file with one parent (volume) zone. However, if other data file types are used or multiple parent zones, these instructions do not apply. Solution: […]

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Error messages compiling Fortran source code using gfortran on Linux

Problem: I get error messages when I try to compile Fortran source code using gfortran on Linux, even though I installed all the necessary “build-essential” gfortran libraries. Unable to compile Fortran source code using gfortran on Linux. Solution: If you are getting error messages when compiling the Fortran source code consider the following. First, the order of calls in the command line is important.  Using Tecplot’s simtest.f90 Fortran source code […]

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How does Tecplot calculate cell or face-centered quantities?

Question: How does Tecplot calculate cell or face-centered quantities? Answer: Tecplot uses simple arithmetic averaging to calculate cell- (face-) centered quantities. Integrations are done using the trapezoidal method, which is second-order accurate. For each cell, the cell-centered value of the quantity being integrated (integrand) is multiplied by the volume of the cell, and the result is summed over all cells. If the integrand is node-centered, the cell-centered average is calculated […]

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Err. Unexpected end of file after location

Problem: I tried to load a data file into Tecplot ad got this error message. What does it mean and how can I fix it? Solution: This error message means that the number of points specified in the header of the data file is greater than the number of points the Tecplot found when it read the file. The only way to fix this is to examine the file to […]

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Binary file version

Problem: When I try to load a file into Tecplot 9 I get this message: Binary file version newer than Tecplot version. Upgrade Tecplot or use an older preplot to produce the data. Solution: The binary file format has been changed with Tecplot 10. If you save a binary file from Tecplot 10 or create a binary file using the current TECIO then try to load the file in Tecplot […]

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