through each passage over the unsteady time period is actually a rigorous and more accurate determination. That capability is not currently in the code, and will be added with the next series of upgrades. The post-processing code was not sophisticated enough to calculate the mass flow in the region of the grid where the O-grid is embedded in the H-grid. A linear curve from the calculated mass flow value upstream of the O-grid to the value downstream of the O-grid is shown in the figure. If mass flow were exactly conserved, there would be no difference between the two. The fact that there was a difference raises a legitimate concern.

Purdue Low Speed Rig 1st Stage VBI3D Prediction

Comparison of Mass Flow with and without Leakage

I 1 > I | 1

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