Pressure‑wave superchargers (PWS) remain a promising alternative to conventional boosting systems due to their intrinsic capability to transfer energy directly between exhaust and intake flows through unsteady gas‑dynamic interactions. Building on the classical COMPREX configuration, this study performs a three‑dimensional numerical investigation of a PWS with modified geometry, using boundary conditions and operating parameters reported in the literature for conventional devices. The objective is to assess the impact of geometric redesign on flow organization, pressure‑exchange efficiency, and overall boosting performance.

A detailed CFD model is developed to capture the transient wave dynamics inside the rotor channels, and the simulation results are systematically compared with reference data for the standard COMPREX unit operating on the same internal combustion engine. The analysis highlights the potential of the modified PWS to deliver improved pressure‑exchange characteristics and enhanced charging performance, demonstrating its suitability for engines fueled with hydrogen or natural gas. These findings support the relevance of pressure‑wave supercharging as a viable boosting solution for low‑carbon and near‑zero‑emission propulsion systems, in line with current regulatory requirements on CO₂ reduction and pollutant emissions.