Boundary Element Analysis with trimmed NURBS and a generalized IGA   approach
  A novel approach to the simulation with the boundary element method using trimmed NURBS patches is presented. The advantage of this approach is its efficiency and easy implementation. The analysis with trimmed NURBS is achieved by double mapping. The variation of the unknowns on the boundary is specified in a local coordinate system and is completely independent of the description of the geometry. The method is tested on a branched tunnel and the results compared with those obtained from a conventional analysis. The conclusion is that the proposed approach is superior in terms of number of unknowns and effort required. 
Gernot Beer and Benjamin Marussig and J\"urgen Zechner and Christian   D\"unser and Thomas-Peter Fries
cs.NA math.NA