High-fidelity and Detailed Chemistry Approaches in IC Engine Modeling

In order to accurately meet legislated fuel efficiency and emission standards, present day IC engines operate across complex combustion modes and use novel fuel formulations. Accurate simulation of these modes and fuel formulations requires the use of detailed chemical mechanisms, which typically span hundreds of species and chemical reactions. Even with advances in modern computing technology and algorithms, detailed chemistry simulation approaches are computationally time consuming and scale with the level of detail employed. Continue reading

16 Cool New Features of ANSYS Fluid Dynamics 16.0

Another release of ANSYS fluid dynamics products, another round of great new capabilities. While some may say that a picture is worth a thousand words, I invite you to view the video below for more than 16,000 words on 16 Cool New Features of ANSYS Fluid Dynamics 16.0. And they are all winners — so this is not a ranking, just a list! Continue reading

And Another Victory for Ferrari – Hats Off!

image of Ferrari with ANSYS logoThe entire ANSYS Family congratulates Ferrari for their World Endurance Championship drivers’, teams’ and manufacturers’ titles in the GTE Pro class. The stats are pretty amazing:

  • 17th World endurance world title for Ferrari
  • 3rd title in a row for the Ferrari-run AF Corse Team
  • AF Corse Team drivers Gimmi Bruni and Toni Vilanderhad from the Ferrari-run AF Corse finish 1st and 2nd of the 2015 World Endurance Championship

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Simulation Confirms Your Mom Was Right – Cover Up When Sneezing!

sneezing in airplaneWinter is coming to the Northern Hemisphere and, with it, lots of travelling for Thanksgiving and the holidays. Did you ever notice that upon traveling you sometimes end up getting sick afterwards? Ever wonder why? Researchers at the FAA Center of Excellence at Purdue University, created this simulation of a sneezing passenger using ANSYS to study the mechanics of pathogen travel in airplane cabins. Continue reading

EPA Imposes Stringent Emission Levels From Engines

EPA emission levelsRecently the Environmental Protection Agency (EPA) imposed more stringent emission levels from engines. These emission restrictions are expected to increase (lower levels) in the near future. As such, modern engine designs, inevitably will need to meet the goal of ultra clean combustion. Different pollutants are emitted due to incomplete combustion, like unburned hydrocarbons (UHC), carbon monoxide (CO), nitrogen oxides (NOx), sulfur oxides (SOx), and black carbon (BC) — also known as soot. The environmental impact of each of these pollutants is well known and can range from reduced visibility due to smog and cloud formation to cancer and premature death when inhaled by respiratory system. Continue reading

Modeling Waves to Keep the Sea Clean

In 2013, over 4400 million tonnes of crude oil was extracted, which caters to roughly 33% of the global need for energy. Most of this oil is extracted from offshore sites and transported to shores for further processing. During this production and transport, if an accidental release of the crude or processed oil occurs, it is called Oil Spill. With the advancement of technology, volumes of oil spilled have reduced over last few decades, however, factors of human error and natural calamity can never be completely ruled out. Continue reading

Collaborating to Reduce Gas Turbine Fuel Burn

The pressure is on to reduce fuel burn for gas turbines of all types. The need is particularly acute for aircraft engines, in that fuel is a large component of operating costs of an airline, so much so that even the volatility in its price can mean the difference between profit and loss. So when airlines demand more fuel efficient aircraft, much of that requirement is passed along to the engine manufacturers. While reducing gas turbine fuel burn is a primary driver, carbon emissions are related, so reducing the fuel burn “kills two birds with one stone”. Continue reading

The Tenth Drop in the Pitch Drop Experiment

image of pitch drop experiment

The pitch drop experiment
© Image published with the permission of the University of Queensland

The Pitch drop experiment was initiated in 1927 at the University of Queensland, Australia. It consists of observing the very slow flow of a highly viscous material through a convergent, under gravity effect. In this experiment, one drop grows and falls within about a decade.

The ninth drop has fallen in April 2014; it needed about 14 years to grow and fall. One may wonder when the tenth drop will fall. Although the key material property, the viscosity, is difficult to measure, it is possible to perform a numerical simulation with ANSYS POLYFLOW software. The very long time interval involved in the experiment suggests using the month as time unit, instead of the second as is usually the case for transient cases. Of course, this requires converting the physical data accordingly. The calculation involves not only the motion of the drop from the conical reservoir into the channel; it also incorporates the development of the pitch drop under the channel exit; this is an important ingredient to the mechanism of the drop formation. Continue reading