I will present an overview of black holes of different origins and masses in the universe and their role as sources of gravitational waves, across the entire wavelength range of future gravitational wave astrophysics. The dynamical evolution of these sources, their detailed gravitational wave emission, and methods for detection will be discussed - this topic ranges from the dynamics of supermassive black holes in galactic nuclei to globular cluster evolution (with stellar mass black holes). The method of Post-Newtonian dynamics is used both for dynamical evolution models and detailed prediction of gravitational wave signals from black hole binaries. We detect objects very similar to the famous recent gravitational wave source GW150914 in our simulated data and show their emitted gravitational waveforms match the observed one; in addition to that we know the detailed dynamical history of the object. If time allows, the necessary high performance supercomputing software and hardware needed to do our simulations, current and future, will be discussed.