Generation of pancake-like high-vorticity
structures in developing hydrodynamic
turbulence is described with a new concept of folding for the
vorticity lines distribution.
Using asymptotic analysis, we establish the universal power law, $\omega_{\max}\propto \ell^{-2/3}$, between the maximum
vorticity and pancake thickness, which determine, respectively, the dynamical and geometrical scales of the corresponding coherent structure.
Numerical simulation, based on a novel numerical scheme that accesses the Eulerian--Lagrangian mapping for vortex lines evolution, verifies our theoretical conclusions.