Townsend-Betchov cascade cartoon
= Townsend-Betchov cascade cartoon
{c}
The <Townsend-Betchov cascade cartoon> organizes <inertial range> <vorticity> into sheets by <bi-axial strain>, then uses sheet instability and roll-up to generate finer <vortex tubes>. Dissipative tube cores balance stretching with <kinematic viscosity>. Such differing mechanisms across scales challenge literal identical-step, memoryless cascade models without contradicting a mean <energy flux>.