When using uniform time steps the scheme equates to:
\[ \ddt{\phi} = \frac{\phi - \oldold{\phi}}{2 \Delta t} \]
The scheme is specified using:
ddtSchemes { default CrankNicolson <coeff> ddt(phi) CrankNicolson <coeff>; }
The coefficient provides a blending between Euler and Crank-Nicolson schemes:
Source code
Reference
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