1994 maximum tornado, but in a big domain

Similar to the 1994 maximum tornado, but with uniform viscosity and a bigger domain. The domain extends to a radius of 4 and a height of 2.

Time history of maximum in w and v, and minimum in u and p.

Time history of the big spike

Here is the big spike that "went off the scale". The integration was repeated with a 3rd order advection scheme (dashed), instead of the 5th order scheme (solid), to give some indication of the robustness of the numerical solution.

Animation from t=165 to t=175, with Δt=0.1