It’s scaled with radial distance from the reference node. Abaqus uses the following techniques for automatic weighting in *DISTRIBUTING:
- linearly decreasing: w_i = 1 - (r_i/r_0)
- quadratic polynomial: w_i = 1 - (r_i/r_0)^2
- monotonically decreasing: w_i = 1 - 3*((r_i/r_0)^2) + 2*(r_i/r_0)^3
where: w_i - weight factor at node i, r_i - radial distance of node i from the reference node, r_0 - distance to the furthest coupling node.