Navigation Links
Lead-flapping objects experience less wind resistance than their trailing counterparts
Date:11/10/2008

It is commonly known that racing cars and bicyclists can reduce air resistance by following closely behind a leader, but researchers from New York University and Cornell University have found the opposite is true with flapping objects, such as flags. Their study, published in the most recent issue of the journal Physical Review Letters, discovered that in a series of flags, the leading flag faces significantly less resistance than do succeeding flags. The finding may alter our understanding of how living flapping creatures, such as birds or fish, move through the air and water.

"Inspired by schooling fish and flocking birds, we studied how flapping flags alter fluid drag forces, or resistance that moving objects face, on one another when grouped together," said Jun Zhang, an associate professor in NYU's Physics Department and its Courant Institute of Mathematical Sciences and a co-author of the study. "To our surprise, we discovered that the leading flag enjoys a drag reduction of up to 50 percent while its downstream neighbor suffers a significant drag increase. If this effect applies to fish schools and bird flocks, the leaders would also have a reduced burden and spend less energy as they swim or fly."

The finding is the first of its kind on fluid flow. All previous studies on rigid objects in a moving fluid show the exact opposite result: the leading object must overcome greater drag forces than the followers.

"Our finding is thus a dramatic violation of our common sense about fluids and structures," Zhang explained.

In the study, the researchers sought to simulate flags flying under windy conditions by inserting flexible filaments ("the flag") to a wire ("the flagpole"). To model wind, they placed the model flag into a flowing soap film. Because the filaments are flexible and massive, they spontaneously flap under the fluid, reacting as flags would in a natural breeze.

Under different flow conditions, Z
'/>"/>

Contact: James Devitt
james.devitt@nyu.edu
212-998-6808
New York University
Source:Eurekalert

Page: 1 2

Related biology news :

1. How we see objects in depth: The brains code for 3-D structure
2. Robot fetches objects with just a point and a click
3. A call to infuse scientific knowledge into the human experience
4. Wild chimpanzees appear not to regularly experience menopause
5. Family conditions may affect when girls experience puberty
6. Montana State University researchers find gene that regulates molds resistance to drugs
7. New estrogen receptor found to be key player in tamoxifen resistance
8. Breast cancer treatment resistance linked to signaling pathway
9. Lab study shows methadone breaks resistance in untreatable forms of leukemia
10. How hidden mutations contribute to HIV drug resistance
11. Genetic cause of innate resistance to HIV/AIDS
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/27/2014)... puts into doubt the long-standing belief that a deficiency ... plays a central role in depression. In the ... mice lacking the ability to make serotonin in their ... wisdom) did not show depression-like symptoms. , Donald ... Medical Center and Wayne State University School of Medicine ...
(Date:8/27/2014)... against trans-fats have largely succeeded in sidelining the ... sugar for its potential contributions to Americans, health ... over the best way to assuage the nation,s ... Chemical & Engineering News (C&EN), the ... , In the article, Stephen Ritter, a senior ...
(Date:8/27/2014)... shown that piglets can be weaned later with no ... of the study at the University,s Roseworthy campus, published ... an important finding for pig producers. It allows improvements ... , "Sows don,t usually start their oestrous cycles again ... have been weaned," says Ms Alice Weaver, PhD candidate ...
Breaking Biology News(10 mins):New study throws into question long-held belief about depression 2Piglet weaning age no bar to litter frequency 2
... This press release is available in French , ... STOCKHOLM (24 AUGUST 2012) As food prices ... the "super drought" in the US, a new study finds that ... and climate risks in sub-Saharan Africa and South Asia. The International ...
... 2012) A nanoparticle developed at Rice University and ... may bring great benefits to the emergency treatment of ... polyethylene glycol-hydrophilic carbon clusters (PEG-HCC), already being tested to ... studies, injections of PEG-HCC during initial treatment after an ...
... a phenomenon never seen before in plants while studying molecular ... In research published online in Proceedings of the National ... team found that one member of a family of proteins ... involved in forming wood, which includes a substance called lignin ...
Cached Biology News:Farmer-led irrigation schemes could alter food security in sub-Saharan Africa, South Asia 2Farmer-led irrigation schemes could alter food security in sub-Saharan Africa, South Asia 3Farmer-led irrigation schemes could alter food security in sub-Saharan Africa, South Asia 4Nanoparticles reboot blood flow in brain 2Nanoparticles reboot blood flow in brain 3
(Date:8/27/2014)... SEATTLE , Aug. 27, 2014  ARCH ... venture firms investing in the development of seed ... its eighth venture fund closed with more than ... exceeded its $250 million subscription target by more ... Fund VIII shows the strength and potential of ...
(Date:8/27/2014)... 27, 2014 According to the 2013 ... reshape the look and feel of markets for raw ... higher-quality ingredients will push for more branded, science-backed products.” ... experienced strong market growth in the last decade as ... food and cosmetics to fit a more ‘wellness’ lifestyle ...
(Date:8/26/2014)...  NeuroSigma, Inc., a Los Angeles ... today announced that it has filed a registration statement ... Commission relating to a proposed initial public offering of ... offered and the price range for the proposed offering ... will act as the book-running manager for the proposed ...
(Date:8/26/2014)... has just been added to the growing case ... the next big thing in the high-tech world ... An international collaboration of researchers led by a ... Lawrence Berkeley National Laboratory (Berkeley Lab) has reported ... in photo-excited MX2 materials. The recorded charge transfer ...
Breaking Biology Technology:Latest ARCH Venture Partners Fund Closes Above $400 Million 2Latest ARCH Venture Partners Fund Closes Above $400 Million 3Daring to be Different Raw Materials & Ingredient Supply Shortage Fuels Vital Force™ Technology New Ingredient Enhancements 2Daring to be Different Raw Materials & Ingredient Supply Shortage Fuels Vital Force™ Technology New Ingredient Enhancements 3Competition for graphene 2
... , SAN FRANCISCO , ... a leader in Integrated Voice Response (IVR)/Integrated Web Response (IWR) ... allows users to design and deploy clinical trial Integrated Response ... of clinical trials. This time and cost savings stems from ...
... , , , , ... /PRNewswire-Asia-FirstCall/ -- Tianyin,Pharmaceutical Co., Inc., (NYSE Amex: TPI ), ... Western Pharmaceuticals,based in Chengdu, China , today announced that ... of Pricing Mechanism of Medicine,and Medical Services by the Chinese ...
... ... Divergence and National Corn Growers Association continues collaboration. , ... (PRWEB) February 9, 2010 -- Divergence, Inc. announced ... totaling $500,000, along with renewed funding from the National Corn Growers Association (NCGA), to ...
Cached Biology Technology:endpoint Saves Money and Time for Medical Research Teams Through PULSE 2endpoint Saves Money and Time for Medical Research Teams Through PULSE 3Tianyin Pharmaceutical Co., Inc. Expects to Benefit from the Recently Published Guide to Pricing Reform for Medicine and Medical Services 2Tianyin Pharmaceutical Co., Inc. Expects to Benefit from the Recently Published Guide to Pricing Reform for Medicine and Medical Services 3New Funding Validates Importance of Divergence's Work on Nematodes 2New Funding Validates Importance of Divergence's Work on Nematodes 3
Fluorescence Preserving Media, 100 mL...
Antibodies were affinity purified using epitopes specific to XLF immobilized on solid support....
...
... Clone/PAD: 3B8A10. Immunogen: ... the C-terminal region of ... Specific for the human ... Human (positive control: 293 ...
Biology Products: