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External Flow – Comparing a CFD Simulation with Experimental Data

Comparing CFD vs Experimental Data

I compare CFD data vs experimental data in this third video in the External Flow Getting Started series. First, I’ll create a classic coefficient of pressure, or a CP plot, and then I’ll show you how to extract a slice, create a new frame, and manipulate XY-line data.

This example uses the ONERA M6 Wind data. The dataset has experimental (measured, test) data gathered using pressure taps along the wing and evaluated in wind tunnel. You will find the results in a Tecplot ASCII-format data file on the NASA ONERA M6 website. I will be using this data for comparison to our CFD run.

Keep in mind two things about this dataset.

  1. The pressure tap measurements were found to have an error of plus or minus .02. The data in the Tecplot 360 examples folder has an added error variable in the file. You will find the data in Tecplot 360 examples folder in your installation.
  2. The experimental dataset from the website is missing this extra information. This data is normalized in both the span and cord directions. The Y direction is normalized by B, the span, and the X direction is normalized by C, the cord.

Appending Experimental Data

After loading the ONERA M6 wing data, you’ll want to append the experimental data. You can do this by choosing File>load data files from the main menu. Choose the experimental data and append that data to the active frame. Check to make sure this worked by opening the Data>Dataset info dialog. You can see that there more than seven zones are listed.

Watch the video to learn how to:

  • Extract CFD Data from the wing surface
  • Extract a slice
  • Calculate normalized x for extracted slices
  • Add a new frame
  • Show experimental data vs CFD data on a plot
  • Add a legend and error bars

Learn more in this webinar: Comparing CFD vs Measured Data through Extractions »

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