About Us

TotalSim is a full-service CFD consulting group that provides expert knowledge and insight to global clients in the automotive, racing, aerospace, and industrial sectors. With decades of experience in aerodynamics and design, we take ideas from initial concept to high performance reality by combining our real-world engineering expertise with our own open-source software. In addition to CFD consulting and software, TotalSim offers industry specific applications, training, support, hardware, and customized CFD codes and tools. With TotalSim’s comprehensive approach, our clients outperform the competition.

Founded in 2009, TotalSim's first office location was in the Dublin Entrepreneurial Center (DEC) was originally a partnership between the City of Dublin, OH and Tech Columbus to foster a collaborative environment for small start-up companies. TotalSim then moved to its own office in 2013, but maintains a close relationship with the City of Dublin and is a key partner with the city on expanding the use of their own 100Gig fiber network. TotalSim has dedicated HPC computing space and connectivity via Dublink fiber to OARnet, Internet2 and other research networks.

TotalSim LLC's sister-company TotalSim Ltd is located in Brackley, England.


Executive Team


 Ray Leto Cfd Consulting

Ray Leto - President

  • 25+ years in race engineering, aerodynamics, simulation and management in Indy & Champ Car. 
  • 10k+ hrs of wind tunnel and 25 yrs track testing experience

Ray Leto received a BS in Aerospace Engineering from Penn State in 1985 and began his career by working his way up through the motorsports ranks as a mechanic and engineer. Ray worked within racing organizations in many roles including Aerodynamicist, Chief Race Engineer, Technical Director, Team Manager, and General Manager.  

As TotalSim’s President Ray performs many roles other than business management and direction, including managing the in-house built 800+ core HPC computer systems, directly working on client’s problems in CFD, wind tunnel, or on-track testing, as well as supporting customer installation of TotalSim software and solutions.

Ray has been PI or Co-PI on several funded projects from DOE, NSMC, and the Ohio Third Frontier. Ray is an active member of SAE International’s Motorsports Engineering and Aerodynamics Committees, a Session Chairman, and peer reviewer of papers published, and a featured expert for the “Chats with the Experts” at SAE World Congress. Ray also holds a seat on the Advisory Board of UNC-Charlotte Motorsports and Automotive Research Center (NCMARC) and The Ohio State University SIMCenter,  as well as advisor to student motorsports programs and OSU and IUPUI.

Ray is an instrument rated private pilot and can usually be found at EAA Airventure each year.


Naethan Eagles - Technical Director

  • 5 years in Aerospace Industry year.
  • 3 years AdvantageCFD / BAR F1
  • 10+ years Williams F1

Naethan graduated in 1993 with an honors degree in Aeronautical Engineering from City University London. After working in a small R&D firm and then Rolls-Royce PLC, in 1998 Naethan joined Advantage-CFD to work with BAR F1 on their aero development program.

Naethan left ACFD in 2001 to start the CFD Department at the BMW-Williams F1 Team. Over the next ten years he grew the size and scope of the department, placing CFD at the heart of all aero development. Naethan’s experience of successfully taking designs from concept through CFD and wind tunnel testing, to implementation and verification on the actual vehicle gives him a rare combination of advanced modeling skills and practical understanding of racecar development.

In January 2011 Naethan left Williams F1 to join TotalSim LLC allowing him to transfer what he's learned during his time at the 'bleeding edge' of motorsports and design, and bring it to bear on new areas and project types. At TotalSim he ensures that all projects are conducted with the latest and most appropriate methods, and as well to set the technical development direction for the company in general.

Naethan is actively involved in day-to-day project work for customers in all business sectors, as well as setting over all Technical and R&D Direction for the company. He has been PI or Co-PI on several funded projects from DOE, NSMC, and the Ohio Third Frontier.

Naethan serves as an NSF panel reviewer and peer reviewer for SAE, and sits as a member of several select committees and task forces for SAE:
Automated Commercial Vehicle Systems Committee
Truck and Bus Aerodynamics and Fuel Economy Committee
Road Vehicle Aerodynamics Forum Committee
Evaluation Method Types Task Force
Operational Efficiency Task Force
Truck and Bus J1252 Wind Tunnel Task Force


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