Senior/Lead Thermal CFD Simulation Engineer (GR 31)

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Date: Jul 23, 2026

Location: Mount Vernon, WA, US, 98273-9671

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Company: PACCAR

Requisition Summary

The PACCAR Technical Center is seeking an experienced Thermal and CFD Engineer for aftertreatment, exhaust, and underbody thermal management to 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.

Company Information

PACCAR is a Fortune 500 company established in 1905. PACCAR Inc is recognized as a global leader in the commercial vehicle, financial, and customer service fields with internationally recognized brands such as Kenworth, Peterbilt, and DAF trucks. PACCAR is a global technology leader in the design, manufacture and customer support of high-quality light-, medium- and heavy-duty trucks under the Kenworth, Peterbilt and DAF nameplates. PACCAR designs and manufactures advanced diesel engines and also provides customized financial services, information technology and truck parts related to its principal business.

Whether you want to design the transportation technology of tomorrow, support the staff functions of a dynamic, international leader, or build our excellent products and services — you can develop the career you desire with PACCAR. Get started!

Job Functions / Responsibilities

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

Develop design recommendations on:

insulation strategy

heat shields

component clearances

exhaust routing geometry

bracket/structure thermal protection

thermal zone definition

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

Qualifications

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, SolidWorks, CATIA, or similar

Excellent problem-solving, analytical, and technical reporting skills

Effective communication and teamwork skills for working with design, testing, and manufacturing teams

Education

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

Paccar Benefits

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

Additional Job Board Information

Job Segment: Thermal Engineering, Aerospace Engineering, Electronics Engineer, Manufacturing Engineer, Mechanical Engineer, Engineering

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