Featured Research

from universities, journals, and other organizations

Astrophysical Fluid Mechanics: A New Method For Simulating Supersonic Turbulence

Date:
May 7, 2008
Source:
CSC - Finnish IT Centre for Science
Summary:
Scientists have developed a new method for simulating turbulent fluids, which will open up new perspectives in the field of astrophysics. Turbulence is worth studying, because of the fundamental role that it plays in astrophysics. Turbulence is frequently modelled by Large Eddy Simulations (LES), where the dynamics of turbulent eddies are computed on large scales, while a subgrid scale model approximates the influence of smaller eddies. In astrophysics the LES approach is challenged, because gravity and thermal processes break the scale-invariance employed in LES over a wide range of scales.

Using DEISA’s computational resources within the DECI framework, the FEARLESS project team has developed a new method for simulating turbulent fluids, which will open up new perspectives in the field of astrophysics.

Turbulence is worth studying, because of the fundamental role that it plays in astrophysics. Turbulence is frequently modelled by Large Eddy Simulations (LES), where the dynamics of turbulent eddies are computed on large scales, while a subgrid scale model approximates the influence of smaller eddies. In astrophysics the LES approach is challenged, because gravity and thermal processes break the scale-invariance employed in LES over a wide range of scales.

In order to overcome this problem a method called Adaptive Mesh Refinement (AMR) can be used. AMR involves inserting computational grids of higher resolution into turbulent flow regions in which strong shock fronts are forming, and the gas is undergoing a process of gravitational collapse.

However, due to the extreme range of different length scales it is generally impossible to treat fully developed turbulence by means of AMR only. This would require too large a number of refined grids. For this reason, the FEARLESS team has developed a new method that combines AMR with a subgrid scale model that links the notions of AMR and LES.

“FEARLESS stands for Fluid mEchanis with Adaptively Refine Large Eddy SimulationS“, says Wolfram Schmidt, one of the two architects of the FEARLESS project. “This somewhat complicated title captures the major elements of our concept: We intend to carry out simulations of turbulent fluids using a method that adapts dynamically to the simulated flow by refining the computation in those regions in which turbulence is developing“, he explains.

Supercomputing resources are very much required in order to apply this method and the DEISA infrastructure has played an important role in the development of the project.

Results from these simulations are significant for ongoing research into the nature of turbulence in star-forming gas clouds in the Galaxy. The project team expects that FEARLESS will generate new perspectives in astrophysics through the as yet unrivalled levels of sophistication it achieves in the treatment of turbulence.

The FEARLESS project was initiated in 2005 by Jens Niemeyer and Wolfram Schmidt, two astrophysicists from the University of Würzburg in Germany.


Story Source:

The above story is based on materials provided by CSC - Finnish IT Centre for Science. Note: Materials may be edited for content and length.


Cite This Page:

CSC - Finnish IT Centre for Science. "Astrophysical Fluid Mechanics: A New Method For Simulating Supersonic Turbulence." ScienceDaily. ScienceDaily, 7 May 2008. <www.sciencedaily.com/releases/2008/05/080506115826.htm>.
CSC - Finnish IT Centre for Science. (2008, May 7). Astrophysical Fluid Mechanics: A New Method For Simulating Supersonic Turbulence. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2008/05/080506115826.htm
CSC - Finnish IT Centre for Science. "Astrophysical Fluid Mechanics: A New Method For Simulating Supersonic Turbulence." ScienceDaily. www.sciencedaily.com/releases/2008/05/080506115826.htm (accessed July 22, 2014).

Share This




More Computers & Math News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Google Plans To Speed Up Web Pages With New Image Format

Google Plans To Speed Up Web Pages With New Image Format

Newsy (July 21, 2014) — Google is using compressed images in WebP format to help boost page loading times. The files are 25-to-34 percent smaller than PNGs and JPEGs. Video provided by Newsy
Powered by NewsLook.com
Uruguayan Creates Chess Game for Multiple Opponents

Uruguayan Creates Chess Game for Multiple Opponents

AFP (July 19, 2014) — It no longer takes two to play chess – or at least according to a new version of the game invented by Uruguayan Gabriel Baldi, where up to four opponents can play. Duration: 00:31 Video provided by AFP
Powered by NewsLook.com
Clock Ticks Down on Internet Speed Debate

Clock Ticks Down on Internet Speed Debate

Reuters - US Online Video (July 18, 2014) — The FCC received more than 800,000 comments on whether and how internet speeds should be regulated, even crashing its system. Lily Jamali reports. Video provided by Reuters
Powered by NewsLook.com
Google Won't Call Games With In-App Add-Ons Free, Apple Will

Google Won't Call Games With In-App Add-Ons Free, Apple Will

Newsy (July 18, 2014) — The European Commission asked Google and Apple not to label apps "free" if they include in-app purchases. Google has complied; Apple has resisted. 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