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1. Create two shrinkwrap parts—one auto hole-filled to be used as the fluid part, and one no auto-hole-fill part to be used as the cutout part. Create solid protrusions from each of the shrinkwraps using the above technique.
2. Create a new assembly, and assemble both shrinkwrap parts so they overlay each other (Fig. 26).
Figure 26. (click to enlarge)
3. Select Component, Adv Utils, Cut Out.
4. Select the part to perform the cutout to (the auto hole-fill shrinkwrap part) and choose Done Sel.
5. Select the parts to use as the cutouts to (the no auto-hole-fill shrinkwrap part) and choose Done Sel, Done.
6. When prompted about supporting associative placement for the feature, click Yes. At this point, what remains in the auto-hole-fill shrinkwrap part represents the wetted volume of the part. The assembly can be used to model both the device under simulation and the wetted volume (Figs. 27 and 28). 
Figure 27. (click to enlarge)
Figure 28. (click to enlarge)
John Randazzo is a mechanical design engineer at ASRC Aerospace, Kennedy Space Center, Florida, USA. He can be reached by email at john.randazzo-1@ksc.nasa.gov.
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