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Coronal mass ejections (CMEs) are primary drivers of space weather andstudying their evolution in the inner heliosphere is vital to prepare for atimely response. Solar wind streams, acting as background, influence theirpropagation in the heliosphere and associated geomagnetic storm activity. Thisstudy introduces SWASTi-CME, a newly developed MHD-based CME model integratedinto the Space Weather Adaptive SimulaTion (SWASTi) framework. It incorporatesa non-magnetized elliptic cone and a magnetized flux rope CME model. Tovalidate the model's performance with in-situ observation at L1, two Carringtonrotations were chosen: one during solar maxima with multiple CMEs, and oneduring solar minima with a single CME. The study also presents a quantitativeanalysis of CME-solar wind interaction using this model. To account for ambientsolar wind effects, two scenarios of different complexity in solar windconditions were established. The results indicate that ambient conditions cansignificantly impact some of the CME properties in the inner heliosphere. Wefound that the drag force on the CME front exhibits a variable nature,resulting in asymmetric deformation of the CME leading edge. Additionally, thestudy reveals that the impact on the distribution of CME internal pressureprimarily occurs during the initial stage, while the CME density distributionis affected throughout its propagation. Moreover, regardless of the ambientconditions, it was observed that after a certain propagation time (t), the CMEvolume follows a non-fractal power-law expansion ($\propto t^{3.03-3.33}$) dueto the attainment of a balanced state with ambient.

SWASTi-CME: A physics-based model to study CME evolution and its interaction with Solar Wind