Finding shifted quadrature points using nonlocal kernel

[hanxustc]

Hi, I’m trying to customize a phase-field model where I need to find the neighboring quadrature points x' of the current point x within a distance range of (d−δ,d+δ). Is there a standard or recommended way to do this using the nonlocal kernel or anything else?

[GiudGiud]

Hello

One way, but possibly not the highest performance, would be to use the Positions system.
This object will store all the quadrature points as positions
https://mooseframework.inl.gov/source/positions/QuadraturePointsPositions.html
Then your kernels can call routines on that Positions object to get the closest Qps