Featured Research

from universities, journals, and other organizations

Novel Simulations Of Turbulent Reacting Flows Provide Insight Into Physics Of Internal Combustion

Date:
January 14, 2002
Source:
University At Buffalo
Summary:
Using a computational method called direct numerical simulation, Cyrus K. Madnia, Ph.D., associate professor of mechanical and aerospace engineering at the University at Buffalo, and his colleagues in UB's Computational Fluid Dynamics Laboratory have performed simulations that are the closest to date to a true model of the physics of chemically reacting turbulent flows.

BUFFALO, N.Y. -- The incredible complexity of turbulent combustion has made modeling it and systems in which it is important a goal that researchers know probably won't be reached in their lifetimes.

The reason is that in turbulent combustion, the difficulties of modeling turbulence -- by itself one of the most challenging problems in physics -- are further compounded by the complexities of strong, non-linear interactions between turbulence and the chemical reactions that occur during combustion.

Using a computational method called direct numerical simulation, Cyrus K. Madnia, Ph.D., associate professor of mechanical and aerospace engineering at the University at Buffalo, and his colleagues in UB's Computational Fluid Dynamics Laboratory have performed simulations that are the closest to dateto a true model of the physics of chemically reacting turbulent flows.

The work, published in the current issue of the Journal of Fluid Mechanics, comes closest to mimicking the turbulent reacting flows that occur in hydrocarbon combustion without taking into account complex chemistry. Knowledge of how these turbulent flows affect internal combustion could greatly improve the efficiency and environmental impact of all kinds of engines. "In reacting turbulent flows, this will be the benchmark," said Madnia, lead author on the paper.

The simulations by the UB researchers come the closest to mimicking hydrocarbon combustion since they demonstrate a defining feature of combustion: how the heat of reaction affects the exchange of energy in a turbulent system.

In every engine or furnace, combustion causes the release of heat, which results in an increase in internal energy. At the same time, the turbulence in the engine is producing kinetic energy. "Between internal and turbulent kinetic energy, there is a continual exchange," said Madnia. "How these two fields exchange energy with each other constitutes the basic physics of turbulent reacting flows."

Madnia cautioned that the flows that he and colleagues have simulated do not account for the incredibly complex chemistry of combustion, which involves hundreds of chemical reactions. "Several decades from now, we still will not be able to simulate internal combustion," remarked Madnia. "But with this research, we are pushing the limit of direct numerical simulations for simulating turbulent combustion."

Unlike the group's previous work with nonreacting flows, where the researchers could "check" their results against those of laboratory experiments, these simulations cannot be compared with laboratory experiments because none exist.

According to Madnia, the goal of the research is to gain a better understanding of the two-way interaction between chemistry and turbulence in order to develop more realistic models of the fluid mechanics and chemistry involved in combustion.

"With this work, we have helped push that frontier a bit further," he said. Co-authors on the paper are Daniel Livescu, Ph.D., formerly a doctoral candidate with the UB Department of Mechanical and Aerospace Engineering who now is at Los Alamos National Laboratory, and Farhad A. Jaberi, Ph.D., formerly a post-doctoral researcher at UB who is an associate professor of mechanical engineering at Michigan State University.

This work is sponsored by the National Science Foundation, and by donors to the Petroleum Research Fund administrated by the American Chemical Society.


Story Source:

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


Cite This Page:

University At Buffalo. "Novel Simulations Of Turbulent Reacting Flows Provide Insight Into Physics Of Internal Combustion." ScienceDaily. ScienceDaily, 14 January 2002. <www.sciencedaily.com/releases/2002/01/020110074549.htm>.
University At Buffalo. (2002, January 14). Novel Simulations Of Turbulent Reacting Flows Provide Insight Into Physics Of Internal Combustion. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2002/01/020110074549.htm
University At Buffalo. "Novel Simulations Of Turbulent Reacting Flows Provide Insight Into Physics Of Internal Combustion." ScienceDaily. www.sciencedaily.com/releases/2002/01/020110074549.htm (accessed July 28, 2014).

Share This




More Computers & Math News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

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
Apple Acquires 'Pandora of Books' Service BookLamp

Apple Acquires 'Pandora of Books' Service BookLamp

Newsy (July 26, 2014) Apple reportedly acquired analytics and recommendation engine BookLamp for between $10 and $15 million. 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