Weighted versus Arithmetic Averages and Tecplot

Calculation, Data Format, Error, Tecplot 360 May 29, 2019

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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Verifying Surface Normals in Integral Calculations

Calculation, Error, Tecplot 360, Vector May 9, 2019

Problem: How do I verify the direction of my unit surface normal vectors to make the correct integrations? If my surface normals point in an inconsistent direction from one timestep to another, how do I correct the value of my integral? From the User’s Manual: “Integrations involving surface unit normals, such as Mass Flow Rate, and Forces and Moments integration, rely on surface unit normals pointing in a consistent direction. […]

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