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Lagrangian Coherent Structures for Design Analysis of Revolving Doors

Benjamin Schindler, Raphael Fuchs, Stefan Barp, Jurgen Waser and Armin Pobitzer, Robert Carnecky, Kresimir Matkovic, Ronald Peikert

ARTICLE, Visualization and Computer Graphics, IEEE Transactions on, December, 2012

Abstract

Room air flow and air exchange are important aspects for the design of energy-efficient buildings. As a result, simulations are increasingly used prior to construction to achieve an energy-efficient design. We present a visual analysis of air flow generated at building entrances, which uses a combination of revolving doors and air curtains. The resulting flow pattern is challenging because of two interacting flow patterns: On the one hand, the revolving door acts as a pump, on the other hand, the air curtain creates a layer of uniformly moving warm air between the interior of the building and the revolving door. Lagrangian coherent structures (LCS), which by definition are flow barriers, are the method of choice for visualizing the separation and recirculation behavior of warm and cold air flow. The extraction of LCS is based on the finite-time Lyapunov exponent (FTLE) and makes use of a ridge definition which is consistent with the concept of weak LCS. Both FTLE computation and ridge extraction are done in a robust and efficient way by making use of the fast Fourier transform for computing scale-space derivatives.

Published

Visualization and Computer Graphics, IEEE Transactions on

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BibTeX

@ARTICLE{Schindler12Lagrangian, 
 author={Benjamin Schindler and Raphael Fuchs and Stefan Barp and Jurgen Waser and
   Armin Pobitzer and Robert Carnecky and Kresimir Matkovic and Ronald Peikert}, 
 journal={Visualization and Computer Graphics, IEEE Transactions on}, 
 title={Lagrangian Coherent Structures for Design Analysis of Revolving Doors}, 
 year={2012}, 
 month={December}, 
 volume={18}, 
 number={12}, 
 pages={2159--2168}, 
 abstract={Room air flow and air exchange are important aspects for the design of 
 energy-efficient buildings. As a result, simulations are increasingly used prior to 
 construction to achieve an energy-efficient design. We present a visual analysis of 
 air flow generated at building entrances, which uses a combination of revolving doors 
 and air curtains. The resulting flow pattern is challenging because of two interacting 
 flow patterns: On the one hand, the revolving door acts as a pump, on the other hand, 
 the air curtain creates a layer of uniformly moving warm air between the interior of 
 the building and the revolving door. Lagrangian coherent structures (LCS), which by 
 definition are flow barriers, are the method of choice for visualizing the separation 
 and recirculation behavior of warm and cold air flow. The extraction of LCS is based 
 on the finite-time Lyapunov exponent (FTLE) and makes use of a ridge definition which 
 is consistent with the concept of weak LCS. Both FTLE computation and ridge extraction 
 are done in a robust and efficient way by making use of the fast Fourier transform for 
 computing scale-space derivatives.}, 
 doi={10.1109/TVCG.2012.243}, 
 ISSN={1077-2626},
 url={http://visdom.at/person/5/},


}






 Last Modified: Jean-Paul Balabanian, 2014-11-06