Flowmaster V7 for
Automotive Applications

Passenger Cars - Commercial Vehicles - Off Highway - Motorcycles
Requirements Simulation Products Airside Air Conditioning Cooling Exhaust Fuel Lubrication

Exhaust Systems

The modern automotive exhaust system is critical in enabling powertrain systems to meet their performance, efficiency, weight and packaging targets. However, during the vehicle development process, it is the exhaust system that is often left until the very end to design.

Using the Exhaust Systems Modelling packages, you can model entire systems from the engine to the rear silencer/muffler and subsequently run simulations under real operating conditions to accurately predict pressures, losses, flow rates and other performance parameters for a given design. Rapid simulations and highly accurate results produced by Flowmaster enable you to optimise and evolve a design before committing to build expensive physical prototypes. Once you have a physical prototype you can correlate your Flowmaster model with your test data and then with even greater accuracy understand small changes to the physical design by first modelling them in Flowmaster.

The Exhaust Systems Modelling Packages from Flowmaster provide many tools for the design and simulation of exhaust systems:

  • Steady State and Transient simulation options
  • Compressible and Incompressible Flowbalancing and Heat Transfer
  • Full Heat Transfer in bends
  • Weighting Factor for irregular bends
  • A wide range of standard and exhaust specific components

In conjunction with the exhaust specific components, standard component catalogues enable you to construct your own custom components including:

  • Accumulators
  • Electro Mechanical
  • Sources and losses
  • Pipes, bends, junctions, transitions, orifices
  • Solids
  • Controllers and Gauges

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  • Model heat transfer effects for both Steady State and Transient flow conditions using a wide range of heat transfer options
  • Examine system pressures, flow rates and temperatures
  • Model with a wide range of standard and exhaust specific components
  • Learn with exhaust specific tutorials and help
  • Co-simulate with other industry tools such as ANSYS FLUENT, STAR-CD and MATLAB®/Simulink® and acoustic simulation packages


  • Validate system pressures, flow rates and temperatures to ensure flow stability during any operating conditions
  • Optimisation of Positive Crankcase Ventilation Valve
  • Meet packaging, performance, cost and acoustic targets
  • Validate and optimise designs for the latest emission reducing powertrain designs (bio-fuels, cylinder deactivation, hybrid, energy regeneration etc)

Case Studies

ArvinMeritor ADEPT allowing 'non-users' to access Flowmaster

ADEPT illustrates the power and flexibility of Flowmaster as part of a design environment. Called from Microsoft® Excel, it allows non-specialist users to get the simulation power they require without needing to learn another product. A specialist can prepare the models and allow a non-specialist to use them without the ability to modify. Protection can be set on data fields so that only specific parameters can be modified.

Eminox optimise exhaust performance and reduce the number of physical prototypes through the use of Flowmaster

Comparing both simulation results with the test results demonstrated that Flowmaster was within 99% accuracy, an improvement on the in-house code which performed well at 93% accuracy.