Senior​/Lead Thermal CFD Simulation Engineer (GR 31

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Date: Jul 23, 2026

Company: PACCAR

The PACCAR Technical Center is seeking an experienced Thermal and CFD Engineer for aftertreatment, exhaust, and underbody thermal managementto drive innovation in heavy-duty truck development. In this role, you'll partner directly with Kenworth and Peterbilt engineering teams to predict design viability, validate concepts through simulation-to-test correlation, and translate complex technical findings into actionable recommendations.

• Perform 3D thermal and CFD analysis for exhaust and aftertreatment systems
• Predict heat loss, pressure drop, underhood and underbody temperatures, under various load cases
• Evaluate DEF system thermal behavior, including doser, hoses, tank interfaces, and filling-related CFD needs
• heat shields
• bracket/structure thermal protection
• Support concept-phase architecture studies, DFMEA inputs, and comparative A/B trade studies
• Conduct quick-turn sensitivity studies and simulation reruns to support design reviews
• Correlate simulation with test/validation data and help build a reusable simulation-to-validation knowledge base
• Develop simulation methodologies for underhood and underbody simulations
• Create engineering guidelines and best practices for clearance, shielding, and thermal protection
• Work cross-functionally with packaging, reliability, validation, plant support, and warranty teams

• 7+ years of engineering experience
• 5+ years of CFD & Thermal Analysis experience
• Experience in industries such as automotive, aerospace, electronics cooling, HVAC, battery thermal management, or other relevant industries
• Comprehension of heat transfer, thermodynamics, fluid mechanics, and numerical methods
• Expertise in CFD modeling, including meshing, solver setup, boundary conditions, and post-processing
• Skilled in CFD/thermal tools such as STAR-CCM+, Fluent, TAITherm
• Experience with CAD tools such as Creo, Solid Works, CATIA, or similar
• Excellent problem-solving, analytical, and technical reporting skills
• Effective communication and teamwork skills for working with design, testing, and manufacturing teams

Bachelor’s degree in Mechanical Engineering or related field, MS or PhD preferred.

As a U.S. PACCAR employee, you have a full range of benefit options including:

• Competitive salary and 401k with up to a 5% company match
• Fully funded pension plan that provides monthly benefits after retirement
• Comprehensive paid time off – Minimum of 10 paid vacation days, 12 paid holidays, and sick leave
• Tuition reimbursement for continued education
• Medical, dental, and vision plans for you and your family
• Flexible spending accounts (FSA) and health savings account (HSA)
• Paid short-and long-term disability program
• Life and accidental death and dismemberment insurance
• EAP services including wellness plans, estate planning, financial counseling and more
• Global Fortune 500 company with a wide array of growth and development opportunities
• Work alongside experienced goal-oriented colleagues recognized as experts in their field

PACCAR is an Equal Opportunity Employer/Protected Veteran/Disability. At PACCAR, we value talent and promote growth and development. We carefully consider numerous compensation factors, including your education, training, or experience. The salary range for Senior/Lead CFD Simulation Engineer is $104,100- $162,900 annually. Additionally, this role is eligible for a full range of benefit options listed above. This is also eligible for a holiday gift.

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