An improved SPH scheme for cosmological simulations

摘要: We present an implementation of smoothed particle hydrodynamics (SPH) with improved accuracy for simulations galaxies and the large-scale structure. In particular, we implement test a vast majority SPH improvement in developer version GADGET-3. use Wendland kernel functions, wake-up time-step limiting mechanism time-dependent scheme artificial viscosity including high-order gradient computation shear flow limiter. Additionally, include novel prescription conduction, which corrects gravitationally induced pressure gradients improves performance capturing development gas-dynamical instabilities. extensively our new wide range hydrodynamical standard tests weak strong shocks as well flows, turbulent spectra, gas mixing, hydrostatic equilibria self-gravitating clouds. jointly employ all modifications;however, when necessary study individual code modules. approximate states more accurately significantly less noise than GADGET-SPH. Furthermore, promotes mixing entropy between different fluid phases, also within cosmological simulations. Finally, solver context radiative galaxy formation non-radiative cluster formation. find galactic discs to be colder extended clusters showing cores instead steadily declining profiles. summary, demonstrate that overcomes most undesirable limitations GADGET-SPH, thus becoming core efficient large