The NSinker benchmark

This is the “NSinker” benchmark defined in

Johann Rudi, Georg Stadler, Omar Ghattas. Weighted BFBT Preconditioner for Stokes Flow Problems with Highly Heterogeneous Viscosity SIAM J. Sci. Comput., 39(5), S272–S297. https://doi.org/10.1137/16M108450X

It creates a number of spherical high-viscosity, high-density sinking spheres in a box geometry that provide a challenge for the Stokes preconditioner. The difficulty of the problem is determined by the number of sinkers and the viscosity contrast between sinkers and background, which can be adjusted in the parameter file.

Files for this benchmark are located in this directory.