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Coronal mass ejections (CMEs) are large eruptions close to the solar surface,where plasma is ejected outwards into space at large speeds. When directedtowards Earth, they interfere with Earth's magnetic fields and cause stronggeo-effective storms. In order to mitigate the potential damage, forecastingtools are implemented. Recently, a novel heliospheric modelling tool, Icarus,has been implemented, which exploits the open-source framework MPI-AMRVAC asits core MHD solver. This new model efficiently performs 3D MHD simulations ofthe solar wind and the evolution of interplanetary CMEs with the help ofadvanced techniques, such as adaptive mesh refinement and gradual radial gridstretching. The numerical methods applied in the simulations can havesignificant effects on the simulation results and on the efficiency of themodel. In this study, the effect of different combinations of numerical schemesand slope limiters, for reconstructing edge-based variabes used in fluxes, isconsidered. We explore frequently exploited combinations from the availablenumerical schemes in MPI-AMRVAC: TVDLF, HLL and HLLC along with the slopelimiters 'woodward', 'minmod', 'vanleer', and 'koren'. For analysis purposes,we selected one particular solar wind configuration and studied the influenceon variables at 1 AU in the equatorial plane. The goal is to find the optimalcombination to produce accurate results fast and in a robust way so that themodel can be reliable for day-to-day use by space weather scientists. As aconclusion, the best result assessed with these two criteria is the combinationof the TVDLF scheme with the 'woodward' limiter.

Exploring the effects of numerical methods and slope limiters in heliospheric modeling