Least squares finite element methods for coupled generalized Newtonian Stokes Darcy flow Least squares finite element method non Newtonian fluids Beavers Joseph Saffman condition a posteriori error estimator adaptive refinement Gauß Newton method. Least squares Finite Element Methode nichtnewtonsche Fluide Beavers Joseph Saffman Bedingung a posteriori Fehlerschätzer adaptive Verfeinerung Gauß Newton Verfahren