Mesh-free hydrodynamics in <scp>pkdgrav3</scp> for galaxy formation simulations

ABSTRACT We extend the state-of-the-art N-body code pkdgrav3 with inclusion of mesh-free gas hydrodynamics for cosmological simulations. Two new hydrodynamic solvers have been implemented, mesh-less finite volume and mass methods. The manifestly conserve mass, momentum, energy, validated a wide range standard test simulations, including also describe improvements to that implemented performing These changes made efficiency modularity in mind, provide solid base implementation required modules galaxy formation evolution physics future porting GPUs. is released public repository, together documentation, all simulations presented this work.