Simulation of Coyote series trials - Part II: A computational approach to ignition and combustion of flammable vapor clouds

Rigas, F; Sklavounos, S

dc.contributor.author	Rigas, F	en
dc.contributor.author	Sklavounos, S	en
dc.date.accessioned	2014-03-01T01:25:09Z
dc.date.available	2014-03-01T01:25:09Z
dc.date.issued	2006	en
dc.identifier.issn	0009-2509	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17566
dc.subject	Cloud fire	en
dc.subject	Combustion	en
dc.subject	Coyote trials	en
dc.subject	Eddy dissipation model	en
dc.subject	Flash fire	en
dc.subject	Ignition	en
dc.subject	P1 model	en
dc.subject	Thermal radiation	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Computer simulation	en
dc.subject.other	Flammable materials	en
dc.subject.other	Heat radiation	en
dc.subject.other	Ignition	en
dc.subject.other	Induction heating	en
dc.subject.other	Pressure effects	en
dc.subject.other	Thermal load	en
dc.subject.other	Vapors	en
dc.subject.other	Cloud fire	en
dc.subject.other	Coyote trials	en
dc.subject.other	Eddy dissipation model	en
dc.subject.other	Flash fire	en
dc.subject.other	Combustion	en
dc.subject.other	fluid dynamics	en
dc.title	Simulation of Coyote series trials - Part II: A computational approach to ignition and combustion of flammable vapor clouds	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ces.2005.09.005	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ces.2005.09.005	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Accidental releases of flammable gases may lead to major fires with extensive effects on the surroundings, mainly due to the intense thermal load emissions. In this paper, a computational approach based on fluid dynamics techniques was attempted aiming at the estimation of resulting thermal radiation emissions and overpressure in large scale cloud fires. In particular, the work dealt with the simulation of Coyote series trials, which conducted in 1981 by Lawrence Livermore National Laboratory (LLNL) and involved the release, dispersion, ignition and combustion of unconfined natural gas clouds in the open-air. In the computations, the CFD code CFX 5.7 was utilized which, in addition to the standard three-dimensional Navier-Stokes equations, incorporates the k-epsilon. model for turbulence modeling, the Eddy Dissipation model for combustion and PI model for radiation transport modeling. Computational thermal radiation histories were compared with experimental data from totally four trials showing a reasonably good agreement for several locations in the field. Discrepancies were laid on overestimation of the thermal load receipted at a certain location, nevertheless within a factor-of-two of the observed values. Moreover, positive peak overpressures were sufficiently low to indicate that the combustion of the cloud yielded a flash fire rather than an explosion. (c) 2005 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Chemical Engineering Science	en
dc.identifier.doi	10.1016/j.ces.2005.09.005	en
dc.identifier.isi	ISI:000235324600010	en
dc.identifier.volume	61	en
dc.identifier.issue	5	en
dc.identifier.spage	1444	en
dc.identifier.epage	1452	en