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Description of relativistic heavy-ion collisions at the energies of RHIC BeamEnergy Scan program with fluid dynamic approach poses several challenges, oneof which being a complex geometry and a longer duration of the pre-hydrodynamicstage. Therefore, existing fluid dynamic models for heavy-ion collisions at theRHIC Beam Energy Scan energies rely on rather complex initial states, such asUrQMD cascade or multi-fluid dynamics. In this study, we show that functionallysimpler, non-dynamical initial states can be employed for the fluid dynamicalsimulations of Au-Au collisions at $\mbox{$\sqrt{s_{_{\rm NN}}}$}=27$ and62.4~GeV. We adapt the initial states based on Monte Carlo Glauber model(GLISSANDO 2) and $\sqrt{T_A T_B}$ ansatz based on reduced thickness (T$_{\rmR}$ENTo $p=0$), extended into the longitudinal direction and finite baryondensity. We find that both initial states, when coupled to a 3D event-by-eventviscous fluid dynamic + cascade model, result in an overall fair reproductionof basic experimental data: pseudorapidity distributions, transverse momentumspectra and elliptic flow, at both collision energies. This is a rathersurprising, given that the $\sqrt{T_A T_B}$ ansatz is functionally similar tothe EKRT and IP-Glasma models, which are successful at much larger energies andrely on a partonic picture of the initial state.

A benchmark of initial state models for heavy-ion collisions at $\sqrt{s_{_{\rm NN}}}=$ 27 and 62 GeV