Summary: Improve performance of radiation view factor calculation.
Flag
ClusterFaces N
N < 0: Disable face clustering.
N = 0: (Default) Enable face clustering. Solver computes optimum cluster factor.
N = 1: Use compaction.
N = 2: Enable face clustering--combine 2 radiation faces per cluster polygon.
N = 3: Enable face clustering--combine 3 radiation faces per cluster polygon.
….
N = x: Enable face clustering--combine x radiation faces per cluster polygon
Description
To improve the performance of the radiation view factor calculation, groups of elements faces belonging to the same surface are grouped into larger polygons. By reducing the effective number of view factor faces, the view factor forming calculation is much faster for large models. Additionally, clustering causes better reciprocity enforcement and faster solution of the radiosity matrix at each iteration.