  Coronal Mass Ejections (CMEs) are the main drivers of the disturbances in
interplanetary space. Understanding the CME interior magnetic structure is
crucial for advancing space weather studies. Assessing the capabilities of a
numerical heliospheric model is crucial, as understanding the nature and extent
of its limitations can be used for improving the model and the space weather
predictions based on it.
  The present paper aims to test the capabilities of the recently developed
heliospheric model Icarus and the linear force-free spheromak model that has
been implemented in it.
  To validate the Icarus space weather modeling tool, two CME events were
selected that were observed by two spacecraft located near Mercury and Earth,
respectively. This enables testing the heliospheric model computed with Icarus
at two distant locations. The source regions for the CMEs were identified, and
the CME parameters were determined and later optimized. Different adaptive mesh
refinement levels were applied in the simulations to assess its performance by
comparing the simulation results to in-situ measurements.
  The first CME event erupted on SOL2013-07-09T15:24. The modeled time series
were in good agreement with the observations both at MESSENGER and ACE. The
second CME event started on SOL2014-02-16T10:24 and was more complicated, as
three CME interactions occurred in this event. It was impossible to recover the
observed profiles without modeling the other two CMEs that were observed, one
before the main CME and one afterward. For both CME studies, AMR level 3 was
sufficient to reconstruct small-scale features near Mercury, while at Earth,
AMR level 4 was necessary due to the radially stretched grid that was used.
