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Article #79

Re: Overpressure Wavefront Analysis

#79
From: lakerb
Date: Mon, 23 Nov 1992 01:19
58 lines
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In article <1ek63aINNjt8@matt.ksu.ksu.edu>, lyn@matt.ksu.ksu.edu (Myself) writes:
>   [note - I have previously posted this on rec.pyrotechnics, who suggested I 
>     try this group]
> 
>   I am looking for formulae / equations / help useful for determining the
> form of abnormalities on the surface of an expanding wavefront caused by
> a medium-scale detonation.
>   In normal english:
>     Assuming and 'ideal' chemical detonation, with the explosive undergoing
> complete and balanced core ---> surface combustion, in an identical - gradient
> atmosphere, the resulting shockwave / overpressure wavefront would be a perfect
> sphere. Aside from the explosive itself, the surface of the sphere is deformed
> in a real atmosphere by variences in the pressure gradients of the surrounding
> atmosphere - 'eddies', or air currents - I need to know if there is a way to
> determine what the shape of the deformations in the surface of the shockwave
> would be (yes, I know that they would be miniscule, and swamped by the shockwave
> itself - that is why I cannot do this empiracly!). I know that this gets very
> complex in a rather annoyingly short time, but I need to know if it is possible
> to do without a CRAY, even for a small, single or double eddy simulation.
>   The things I need specifically are :
>       A) Formulae or equations for the fluid dynamics
>       B) Suggestions for implementing A in a reasonable manner
>       C) Any miscellaneous other help available
> 
>     Thank you all in advance, and gratituedes for reading this post,
> 
> 	Myself (lyn@matt.ksu.ksu.edu)
> 	StormWind @ kids MUSH
> 	VERY amateur visualization programmer
> 	And many other irreleavant things
> 
> P.S. This is completely theoretical, and as far as I can see, does not have any
> 	scientific value, other than edifying myself. (I can, however, post
> 	any results that may come up, if enough interest is shown)
> 
> 
> 
> -- 
> This was brought to you by Myself(lyn@matt.ksu.ksu.edu) who is all things here.
> Head of Synergy Systems, a non-official group of aspiring hackers creating and
> distributing software for the common good. Head office:Terra, Sol system. We
> Flames accepted-and returned with interest and intelligence compounded.

Suggest you contact the Public Information Officer at the US Bureau of Mines in
Bruceton, Pa.  They have been exploding and modeling explosions for decades.

Another contact is the Christian Mickelsen Institute in Bergen, Norway.

The Center for Chemical Process Safety of the American Institute of Chemical
Engineers (16th St??), Washington, DC. have held symposia (published)
containing work on explosion modeling.

The Journal of Hazardous Materials, Journal of Fluid Flow Research, etc. are
other sources.

Rob Lake
BP Research
lake@rcwcl1.dnet.bp.com
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Message-ID: <1992Nov22.191901.42@rcwusr>
Path: arc1-ca.pugleaf.net!sparky!uunet!rcwusr.bp.com!lakerb
References: <1ek63aINNjt8@matt.ksu.ksu.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!rcwusr.bp.com!lakerb
From: lakerb@rcwusr.bp.com
Newsgroups: sci.geo.fluids
Subject: Re: Overpressure Wavefront Analysis
Message-ID: <1992Nov22.191901.42@rcwusr>
Date: 22 Nov 92 19:19:01 -0600
References: <1ek63aINNjt8@matt.ksu.ksu.edu>
Organization: BP Research, Cleveland, OH (USA)
Lines: 59