  Coronal mass ejections (CMEs) are primary drivers of space weather and
studying their evolution in the inner heliosphere is vital to prepare for a
timely response. Solar wind streams, acting as background, influence their
propagation in the heliosphere and associated geomagnetic storm activity. This
study introduces SWASTi-CME, a newly developed MHD-based CME model integrated
into the Space Weather Adaptive SimulaTion (SWASTi) framework. It incorporates
a non-magnetized elliptic cone and a magnetized flux rope CME model. To
validate the model's performance with in-situ observation at L1, two Carrington
rotations were chosen: one during solar maxima with multiple CMEs, and one
during solar minima with a single CME. The study also presents a quantitative
analysis of CME-solar wind interaction using this model. To account for ambient
solar wind effects, two scenarios of different complexity in solar wind
conditions were established. The results indicate that ambient conditions can
significantly impact some of the CME properties in the inner heliosphere. We
found that the drag force on the CME front exhibits a variable nature,
resulting in asymmetric deformation of the CME leading edge. Additionally, the
study reveals that the impact on the distribution of CME internal pressure
primarily occurs during the initial stage, while the CME density distribution
is affected throughout its propagation. Moreover, regardless of the ambient
conditions, it was observed that after a certain propagation time (t), the CME
volume follows a non-fractal power-law expansion ($\propto t^{3.03-3.33}$) due
to the attainment of a balanced state with ambient.
