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Our next challenge is to produce velocity vectors. This is a very similar process to creating the temperature contours above. On the top menu, click on vector 
. Name it "Velocity Vector" and click OK. Under Details of Velocity Vector, select periodic 1 for Locations. Select Velocity for Variable. This tells CFD-post we are looking for vector plots of velocity.
In the next step, we will specify the appearance of vector arrows. Select the Symbol tab. Enter 0.05 for Symbol Size. This again is dependent on personal preference.
Finally click Apply. You will see that under Outline > User Locations and Plots, Velocity Vector is created. Un-check Temperature Contour so that Graphics window shows just the Velocity Vector plot. You can mirror the plot about the axis as before. You can translate the model to look at flow development near the entrance. There is a toolbar option at top that puts you in translate mode. You can click on the z-axis to restore our original view.
The velocity vectors are shown below:
You can zoom in and out and move the contour using the tools right above the contour:
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<iframe width="560" height="315" src="https://www.youtube.com/embed/HX27T78mQfg?rel=0" frameborder="0" allowfullscreen></iframe> |
Summary of the Above Video:
- Click Vectors > Name Velocity Vectors
- In Details plot Velocity
- In Variable > Color by Variable
- Color by temperature
- Color by temperature
We see that the flow speeds up as the density decreases in order to keep the same mass flow rate. 
Does the flow become fully developed at the end of the first section?
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