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Tunnel Ventilation Systems – Principal Mechanical Engineer / CFD simulation Tunnel Ventilation Systems – Principal Mechanical Engineer / CFD simulation at AECOM We are seeking a Principal Mechanical Engineer with extensive experience in Tunnel Ventilation Systems (TVS) and Computational Fluid Dynamics (CFD) / Subway Environment Simulation (SES) modelling for Metro, Rail, and Road tunnel projects. The role includes technical leadership, ventilation system design, simulation oversight, and client‑facing coordination. Responsibilities Lead the design, verification, and performance assessment of Tunnel Ventilation Systems (TVS) for Rail, Road, and Metro tunnels. Serve as a primary technical representative to clients (both internal and external), participating in workshops, reviews, and responding to technical queries. Prepare and/or review engineering calculations, system layouts, mechanical design drawings, equipment sizing and technical specifications. Ensure all designs comply with Employer Requirements, project specifications, and applicable standards, especially when coordinating with FLS (Fire & Life Safety) and RAMS teams. Lead the development of simulation models on SES (Subway Environment Simulation), IDA Tunnel, FDS (Fire Dynamics Simulator) or any other equivalent software for defining the air flow requirement of TVS fans and also for fire simulation for various scenarios. Lead the development of 3D CFD simulation on Pyrosim or any other equivalent software for Smoke Management system. Coordinate TVS design with other disciplines, especially SMEP (Structural, Mechanical, Electrical & Plumbing), Architecture, Systems and Civil, to correctly develop models that accurately reflect the tunnel networks, station(s) and facilities. Lead space proofing and equipment access/maintenance planning for TVS components. Prepare and validate Modes of Operation (MoO) tables for system control and integration with SCADA (Supervisory Control and Data Acquisition) / tunnel control systems. Qualifications A minimum of 8 to 10 years of experience in Metro, MRT/LRT, Rail/Road tunnel ventilation design simulation. Proficiency in SES (Subway Environment Simulation), IDA Tunnel, FDS (Fire Dynamics Simulator) or any other equivalent software. Willingness to take on the challenge of leading and developing a new multidisciplinary engineering team, fostering collaboration, knowledge sharing, and high-quality technical delivery. Familiarity with BIM workflows and design coordination platforms (ACC, SharePoint, ProjectWise). Excellent analytical and problem‑solving skills. Ability to perform complex calculations and conduct engineering tests. Experience in gathering and correlating engineering data. Strong communication and interpersonal skills. Capability to work independently and manage multiple projects efficiently. Capability to develop and grow teams. Familiarity with relevant industry codes and standards. Demonstrated ability to innovate and think creatively in engineering solutions. Excellent organizational skills and attention to detail. Willingness to learn and adapt to new technologies and methodologies. Preferred Qualification Bachelor’s degree in Mechanical Engineering, or related discipline, complemented by specialized training in tunnel ventilation, fire safety engineering, or CFD simulation. Additional Information At AECOM, you will have freedom to grow in a world of opportunity. Our Freedom to Grow philosophy supports flexibility and balance to help our people thrive. As an Equal Opportunity Employer, we believe in your potential and are here to help you achieve it. All your information will be kept confidential according to EEO guidelines. #J-18808-Ljbffr