UMBA 2 is simply a first pass at solving a fairly complex problem. Unfortunately, I don’t believe the rest of the solution can be solved only on a computer. The research we’ve done so far has filled in one or two locations in our parameter space. That means that, of Continue Reading
Andrew Smith
UMBA 2.0
Click here for the GitHub link This new version contains a model for the seam shifted wake. Before I get into it I want to make a couple of things clear. First, there is a quote from statistician George E.P. Box, “All models are wrong but some are useful.” I Continue Reading
UMBA 1.1
Click here for the GitHub link. This update is primarily focused on making the code more functional. The major things I’ve added are: Multiple pitches code writes a file for each pitch code now asks if the user would like to compare another pitch a final set of plots shows Continue Reading
UMBA 1.0
If you are unfamiliar with the Pitch Trajectory simulator UMBA, please visit our page about it here. You can download UMBA 1.0 here As of now, we don’t know enough about things like spin decay, spin axis changes during flight, seam height, scuffs, and of course seam orientation to model Continue Reading
Baseball Rubbing Mud and its Effect on Roughness: Post #25
As we showed in post 23, a ball with rough leather tends to produce a turbulent flow which delays the boundary layer separation. Roughness, in fluid dynamics, is difficult to nail down. We typically use “relative roughness” which is a ratio of the mean height of the roughness to (in Continue Reading
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