Lead Thermal Systems Engineer | Leitender Ingenieur Thermik

Thermal Systems Engineer · Patent Holder | StarCCM+ · ANSYS Fluent · MATLAB · CFD · CHT · 1D | eVTOL (Lilium) · EV (Rimac) · Gas Turbines (GE) | V&V · DO 160 | Open to Contract

• Ansys
• Computational Fluid Dynamics7 J.
• Ingenieur-Thermal
• Maschinenbauingenieur
• Strömungsmaschinenbau / Turbomaschine
• Strömungssimulation
• Teamleiter
• Thermodynamik7 J.
• Wärmeübertragung

Nikola Vranjić | thermIT consulting
Lead Thermal Systems Engineer
Aerospace • Electromobility • Power Generation • High power density cooling
Zagreb, Croatia | +385 99 693 1784 | nikola@thermit.tech | https://www.linkedin.com/in/nikola-vranjic/

Executive Summary
Thermal Systems Engineer with 11+ years of experience delivering cooling solutions for Lilium, Rimac, and GE / Alstom. Focus on system level thermal concepts and execution through simulation, validation, and hardware. Track record in reducing thermal risk and supporting testing and certification.
Core Expertise
• System level strategy: requirements, cooling concepts, trade off studies for propulsion and high power density systems
• CFD and CHT: 3D CFD, conjugate heat transfer, multiphase, StarCCM, ANSYS Fluent, CFX
• Multi fidelity coupling: 1D and 3D models, MATLAB Simscape, OpenModelica, transient missions
• Additive cooling design: patented cooling geometries for gas turbine applications
• Testing and validation: correlation with bench and system test data
• High power density cooling: gas turbine components, battery systems, electronics
Experience
eVTOL Propulsion and Aerothermal Integration, Lilium, 2021 to 2024
• Defined thermal strategy for propulsion systems under weight and integration constraints
• Performed 1D and 3D trade offs for cooling concepts
• Delivered 3 Technical Design Specifications supporting hardware validation and certification
High Performance EV Powertrain Development, Rimac Automobili, 2018 to 2021
• Led thermal development for battery systems, power electronics, and vehicle applications
• Managed thermal team of 10 engineers
• Delivered solutions for OEM programs, Porsche, Hyundai, Koenigsegg
Gas Turbine Cooling Development, General Electric, 2014 to 2018
• Developed cooling concepts for combustor components under extreme loads
• Designed additive manufactured burner components
• Lead inventor on patented solution improving efficiency and reducing cost and emissions
Technical Toolbox
• CFD and CHT: StarCCM, ANSYS Fluent, OpenFOAM, CFX, ICEM, Fluent Meshing
• 1D Systems: MATLAB Simscape, Flowmaster, OpenModelica, Dymola
• Thermal and structural: ANSYS Workbench, SC03
• CAD and PLM: CATIA v5, Solidworks, SpaceClaim
• Languages: English full professional, German A1 A2 (improving)
Consultancy Model DACH Region
• Availability, 100 percent
• Setup, 80 percent remote, 20 percent onsite
• Location, Zagreb, less than 1 hour flight to Munich, Stuttgart, Zurich

StarCCM+, Ansys FLUENT, OpenFOAM, ICEM, MATLAB, Simulink/Simscape, OpenModelica, Excel, Dymola, Python