How to use "New boundary conditions for the oscillating velocity from far fields"

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I also want to ask the question of unsteady optimization, I saw that DAfoam implemented "New boundary conditions for the oscillating velocity from far fields" and gave an example: "myPatch
{
type varyingVelocityInletOutlet;
U0 10;
URate-0.2;
flowComponent 0;
normalComponent 1;
alpha0 0;
alphaRate 0.1;
}"
But I don't know how to modify the file is right, I modified "0 _orig under" file "U", the result is an error "Unknown patchField type varyingVelocityInletOutlet for patch type patch". What should I do with this, please? I don't see any tutorials on the website? Thank you for answering the question！
pitch.zip