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EPA to Use ANSYS FORTE to Prove CAFE Standards Are Achievable

Flame propagation for spark-ignition engine simulation in ANSYS FORTE software. Cut plane showing automatically generated mesh. (Image courtesy of ANSYS)

Streamlines showing intake process for a spark-ignition engine in FORTE simulation software. (Image courtesy of ANSYS)

Are the upcoming Corporate Average Fuel Economy (CAFE) standards realistic or achievable? It’s something EPA has to first find out for itself. To do that, the Agency is using ANSYS FORTÉ, a package for simulating combustion engine activities.

According to the announcement released by ANSYS today, EPA plans to use FORTÉ software “to model in-cylinder combustion to develop an advanced test engine that will demonstrate fuel-saving and emissions-reducing technologies.”

ANSYS FORTÉ used to be a product of Reaction Design, based on San Diego, California. The product became part of the ANSYS portfolio when Reaction Design was acquired by ANSYS this January.

CAFE was signed into law in 1975 by the Congress. The pressure is now on, since NHTSA has set standards to increase CAFE levels rapidly over the next several years.

Bernie Rosenthal, formerly CEO of Reaction Design, now GM of ANSYS, said, “What [EPA] is trying to do is to put together a virtual prototype engine. The [tests and simulations] will prove to the automotive manufacturers that [the CAFE] standards are achievable. Their selection of FORTÉ is based on the software’s capabilities in [allowing users] to select the type of injectors, the timing, and the type of fuels used, to see how that fuel is mixed inside the engine.” The simulation exercise allows automakers to determine the expected tailpipe emission from an engine before they manufacture the engine; therefore, it serves as one of the ways to avoid costly design flaws that would prevent them from meeting the CAFE standards.

Matthew Spears, Heavy-Duty Onroad and Nonroad Center Director of EPA’s Office of Transportation and Air Quality, said, “Using ANSYS solutions to generate realistic 3D simulations of internal combustion engines, we can gain visibility into critical engine behaviors in a timely, cost-effective manner and obtain accurate and predictive results to guide the development of our test engine.”

Rosenthal clarified EPA’s selection of FORTÉ doesn’t meant EPA will require automakers to use the same software in their own engine design development and tests to meet the CAFE standards. An automaker can potentially use FORTÉ or one of the many CFD codes currently available in the market. Nevertheless, the Agency’s choice of software will like be a signal to many other car makers that FORTÉ is a good choice for the type of simulation necessary to pass the CAFE standards.

ANSYS says, “In addition to gaining a better understanding of combustion dynamics through CFD modeling, the EPA intends to use ANSYS’ detailed soot modeling capabilities to more accurately predict soot mass and particle size distribution, important metrics in the standards.”



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About Kenneth

Kenneth Wong has been a regular contributor to the CAD industry press since 2000, first an an editor, later as a columnist and freelance writer for various publications. During his nine-year tenure, he has closely followed the migration from 2D to 3D, the growth of PLM (product lifecycle management), and the impact of globalization on manufacturing. His writings have appeared in Cadalyst, Computer Graphics World, and Manufacturing Business Technology, among others.

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