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For Flow Simulation, what is the difference between Average Velocity and Bulk Average Velocity?

Question asked by Adam Miess on Sep 8, 2017
Latest reply on Jun 20, 2019 by Goncalo Costa Martins

In flow simulation, there is an option in the surface goals for Average Velocity and Bulk Average Velocity.  Typically, when I run a simulation, the values are close if I have the software find both for a particular surface, but on one of my surfaces, the values are very different.  What is the actual difference between the two options?