It’s not to late to sign up to attend the 66th Annual Meeting of the American Physical Society’s Division of Fluid Dynamics meeting, where you can witness this presentation:
Abstract: E9.00003 : Urinal Dynamics
In response to harsh and repeated criticisms from our mothers and several failed relationships with women, we present the splash dynamics of a simulated human male urine stream impacting rigid and free surfaces. Our study aims to reduce undesired splashing that may result from lavatory usage. Experiments are performed at a pressure and flow rate that would be expected from healthy male subjects. (Lapides, J., Fundamentals of Urology, W.B. Saunders, Philadelphia, 1976.) For a rigid surface, the effects of stream breakup and surface impact angle on lateral and vertical droplet ejection distances are measured using high-speed photography and image processing. For free surface impact, the effects of velocity and fluid depth on droplet ejection distances are measured. Guided by our results, techniques for splash reduction are proposed.
I think I have acquired some insight into the mind of our weird foster cat. She always comes racing into the bathroom when I’m trying to use it, and she peers intently at streams of water and will hop onto the toilet to stare fixedly at the vortex when it flushes. She’s just a wanna-be fluid dynamics physicist!