Abstract
UG [2] is a software framework for the numerical solution of problems that are described by systems of partial differential equations. It provides functionality for unstructured grids, adaptive local grid refinement, robust multigrid methods for the solution of systems of linear equations, and parallelization of all these algorithms on MIMD-style computers. In this contribution, we present results of an application built upon UG, a finite-volume simulator for thermohaline-driven flow called d(3)f [3], on HLRS' Nehalem cluster.