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Comparing Grids: Interpolation of Differing Meshes


Description

This is the third video in the Comparing Grids tutorial series. In a previous video, we demonstrated how to compare different data sets of similar grids using Tecplot 360. In this video, we will take it a step further and compare two data sets with differing meshes.

For this example, we will be looking at the wing surface for two simulations, one with a small tail and another with a larger tail. All input variables such as Alpha, Mach and Beta were consistent between the simulations.

Linked Data Sets

At this point we have three frames with linked data sets, and the views in each frame contain both simulation results. However, the upper frame is showing only the small-tailed simulation and the bottom frame is showing the large-tailed simulation.

With the frame on the right active, we will select the large-tailed simulation and duplicate it (Data > Create Zone > Duplicate…). We are selecting the large-tailed simulation as the entire body of the small-tailed simulation fits within the bounds of the large-tailed simulation.

Inverse Distance Interpolation

The critical step we will be performing now is an inverse distance interpolation, bringing the point values from the small-tailed mesh onto the large-tailed mesh for all variables of interest. By doing this we are able to follow the same steps that were outlined in the previous Comparing Grids in Tecplot 360 video.

Data Alter Differencing

From here we will perform the data alter differencing as we did before.

“{Cp} = {Cp}[1]-{Cp}[3]” ensuring that this calculation is only applied to the third zone.

The same styling effects can be applied, ensuring that only the differenced zone is shown, and then by applying a diverging color map.

Comparing Grid Video Series

Comparing Grids in Tecplot 360
Comparing Grids in Tecplot Chorus

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