Featured Research

from universities, journals, and other organizations

Combustion Simulation: Digital Fireworks

Date:
August 12, 2009
Source:
ETH Zurich
Summary:
Researchers have simulated autoignition in a turbulent flow using a supercomputer with up to 65,000 processors in one of the largest reactive flow simulations to date. The results could help to develop better models and reduce the high cost of real experiments.

Volume rendering of hydroperoxy (HO2) radical concentration during autoignition. The red colouring indicates a high HO2 concentration. The little green "bubble" below is about to auto-ignite.
Credit: Photo: LAV/ETH Zurich

Researchers from ETH Zurich have simulated autoignition in a turbulent flow using a supercomputer with up to 65,000 processors in one of the largest reactive flow simulations to date. The results could help to develop better models and reduce the high cost of real experiments.

A team of researchers from the Laboratory of Aerothermochemistry and Combustion Systems (LAV) headed by Professor Konstantinos Boulouchos recently presented initial results of one of the largest reactive “Direct Numerical Simulations” (DNS) to date. The simulated autoignition of hydrogen in a turbulent hot air coflow is essentially a laboratory experiment performed on the computer. The fuel ignites by itself when its pressure and temperature is high enough.

“The main advantage of such a numerical simulation over a “real” experiment is that data like the flow velocity, temperature, pressure and concentration of the individual chemical components can be measured accurately with a high temporal and spatial resolution. It would simply be impossible to obtain such detailed information in a real experiment”, explains Christos Frouzakis, head of the DNS group at LAV.

100 terabytes of data for 11 milliseconds

The software used for the simulation is the result of a long collaboration between the LAV group and the Argonne National Laboratory (ANL) near Chicago, and had already been used successfully in less demanding computations. In order to make the simulation on tens of thousands of processors possible, Stefan Kerkemeier, a doctoral student at LAV, and Paul Fischer from ANL optimized and further expanded the code over the last two years.

The simulation was performed on the IBM BlueGene/P at ANL, one of the world’s largest high-performance supercomputers. It required about 12 days on up to 65,000 processors to calculate 11 milliseconds of real time. According to Kerkemeier, at the time of the computations (December 2008), such a simulation was not possible in Switzerland due to lack of computational resources. Over 100 terabytes of data were collected with a temporal resolution of 3 microseconds and a spatial resolution of 30 micrometers. “The wealth of data is enormous. The next big challenge is to analyze the results of the simulation and understand the processes involved”, stresses Kerkemeier.

For more efficient engines and energy from hydrogen

A better understanding of autoignition is necessary for the development of more efficient engines. So far, the simulation used hydrogen as the fuel. “We used hydrogen because the computational time would be too long with petrol or diesel due to their complex chemical composition”, explains Konstantinos Boulouchos. However, hydrogen could become increasingly important in the future, according to Boulouchos. For example when coal or natural gas is converted into hydrogen in order to be burnt in a gas turbine, while carbon dioxide is separated before the combustion chamber.


Story Source:

The above story is based on materials provided by ETH Zurich. Note: Materials may be edited for content and length.


Cite This Page:

ETH Zurich. "Combustion Simulation: Digital Fireworks." ScienceDaily. ScienceDaily, 12 August 2009. <www.sciencedaily.com/releases/2009/07/090725203431.htm>.
ETH Zurich. (2009, August 12). Combustion Simulation: Digital Fireworks. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2009/07/090725203431.htm
ETH Zurich. "Combustion Simulation: Digital Fireworks." ScienceDaily. www.sciencedaily.com/releases/2009/07/090725203431.htm (accessed July 29, 2014).

Share This




More Computers & Math News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Teen's Phone Ignites Under Her Pillow; How Real Is The Risk?

Teen's Phone Ignites Under Her Pillow; How Real Is The Risk?

Newsy (July 28, 2014) A Texas teen's Samsung phone apparently ignited while she slept, but what was the real problem here? Video provided by Newsy
Powered by NewsLook.com
Google's Next Frontier: The Human Body

Google's Next Frontier: The Human Body

Newsy (July 27, 2014) Google is collecting genetic and molecular information to paint a picture of the perfectly healthy human. Video provided by Newsy
Powered by NewsLook.com
Cellphone Unlocking Bill Clears U.S. House, Heads to Obama

Cellphone Unlocking Bill Clears U.S. House, Heads to Obama

Reuters - US Online Video (July 27, 2014) Congress gets rid of pesky law that made it illegal to "unlock" mobile phones without permission, giving consumers the option to use the same phone on a competitor's wireless network. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Congress OKs Unlocking Phones From Carriers

Congress OKs Unlocking Phones From Carriers

Newsy (July 26, 2014) A bill legalizing "unlocking," or untethering a phone from its default wireless carrier, has passed Congress and is expected to be signed into law. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins