I think I may have just solved a Millennium Problem. I found an exact 3D solution to Navier-Stokes equations that has a finite time singularity. The velocity, pressure, and force are all spatially periodic. The solution has a time singularity at t=T, where T is greater than zero and less than infinity.
I think it's correct, but I may have overlooked something. I don't have a Phd, but I'm not a complete noob. I have a Bachelor of Science in Mechanical Engineering. I posted it on vixra because I'm not endorsed on arxiv. Is the counterexample correct? thanks.