DTU wants to purchase a fast, high capacity, HPC cluster for wind energy, mechanical structure optimization and general research purposes, with an emphasis on Computational Fluid Dynamics (CFD) models. A large part of the research in wind energy technology is centered around computer models, from advanced structural modeling, aeroelastic and dynamic stability, aerodynamics, incompressible finite volume based computational fluid dynamics models, wind resources and mesoscale meteorological models. The typical workload on the computer is a blend of large parametric studies of relative short single processor runs, parallel runs utilizing a limited number of CPU's with high memory requirement, and massive parallel runs with balanced memory requirements. A range of software is in use, ranging from locally developed applications to standard scientific software from other research institutes and commercial vendors.