Rocket Pictures #7
Computational Fluid Dynamics
or, phun with physics!
According to RockSim, an Alpha on a C6-5 has a top speed of 522 ft/sec. I ran three cases:
- No launch lug.
- Launch lug mounted at the CG (stock, per instructions).
- Split launch lugs, one at the base of the nose, and the other between the fins.
The results are inconclusive, since I left the bottom of the rocket flat, there is a large low pressure area behind the rocket, giving a false drag reading. I need to add a tail cone and rerun the analysis. The plots below show some initial results.
Since this was a training class, I didn't have time to complete the analysis. We were running on really old PCs, and each run took about an hour. There are a bunch of settings I could tweak to get better resolution, but that will have to wait until I am back on my "home" monster machine. I also got one shot to create the graphics, and I failed to make the color scale legends the same for all cases. Once we get the software installed, I plan to work on this to see if I can determine an optimum launch lug size and placement.
For more information on CFD analysis, go to CFD Online