While the existence of a strongly interacting state of matter has been established in the heavy ion collision experiments in the past decade, the task remains to map out the transition from hadronic state to the QCD matter. This is done by measuring the dependence of key observables (such as particle suppression and elliptic flow) on the collision energy of the heavy ions. This procedure, known as "beam energy scan", has been most recently performed at RHIC.
In this talk I present some energy scan results for elliptic and triangular flow, as well as the pT spectra of produced particles, utilizing the Boltzmann+hydrodynamics model described in [1,2]. This approach allows to investigate the relative importance of hydrodynamics and hadron transport at different energies, and also to study the beam energy dependence of initial state fluctuations.
 H. Petersen, J. Steinheimer, G. Burau, M. Bleicher and H. Stocker, Phys. Rev. C78, 044901 (2008).
 P. Huovinen and H. Petersen, arXiv:1206.3371.