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David Deepwell authored
Vortex stretching is one of the dominant terms in both the vorticity equation and enstrophy equation. They also help in understanding the vortex dynamics and how energy at large scales cascades into small scales. The three components of vortex stretching (omega dot grad) u and the enstrophy stretching production (omega_i omega_j S_ij) are now included and can be computed with the derivatives case file. Files for vortex stretching terms are called vort-stretch<dim> where <dim> is one of x,y,z. The enstrophy stretching production file is called enst-stretch. As these quantities are the product of velocity gradients, care must be made to ensure adequate resolution is present. Update version to 2.0.3
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