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Flame velocity in explosion [message #18637] Wed, 26 January 2000 00:00 Go to next message
shearerm is currently offline  shearerm
Messages: 11
Registered: July 1999
Junior Member
I have a scattered array of data that represents the flame arrival
times for given locations during a gas explosion within a 3d volume. I
need to calculate the velocity of the flame. Does anyone one have any
suggestions as to how I might achieve this within IDL.

regards
Murray

--
BP Amoco
Exploration
Upstream Technology Group



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Re: Flame velocity in explosion [message #18713 is a reply to message #18637] Wed, 02 February 2000 00:00 Go to previous message
wbiagiot is currently offline  wbiagiot
Messages: 59
Registered: January 1999
Member
Lol, Ok Murray.

Well, I'm not sure what your thought process on this is, but here are
some of my 1st thoughts and not necessarily related to IDL. Your
problem as stated is a calculation of velocity (distance over time, I
believe). You've stated that you have the time data and therefore need
the distance data to complete the equation. Simplistically, one might
assume that the flame starts from a single point in 3d space (XYZ)(spark
from an electrode, ie.). Then, you could apply the old D^2 = deltaX^2 +
deltaY^2 + deltaZ^2 distance formula on each data pt to calculate a
matrix of velocity data. If you want to present some kind of snazzy
visual display, draw all of the velocity vectors on a 2D or 3d plot with
the color set to a value corresponding to speed. Something like:

color_code = ((velocity_n - min_velocity) / (max_velocity -
min_velocity)) * 255

..giving a color code of 0 to 255.

Oh yeah, and set the color table to one of the 40 or so that IDL
supplies. Something like the 3d trackball widget might give some
viewing options, but I have never used it. See the IDL demo to see how
it works.

Well, I sketched that all out on my bagel plate so I'm sure it's at
least 50% incorrect. (The seeds get in the way) Feel free to let me
know that I'm all wet.

-Bill B.

--

"They don't think it be like it is, but it do."

Oscar Gamble, NY Yankees


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Re: Flame velocity in explosion [message #18755 is a reply to message #18637] Fri, 28 January 2000 00:00 Go to previous message
shearerm is currently offline  shearerm
Messages: 11
Registered: July 1999
Junior Member
Unfortunately I work for exploration, but if you can answer my question
I'll have a word with my colleagues in oil and see what I can do.....


In article <86q055$hk8$1@nnrp1.deja.com>,
wbiagiot@suffolk.lib.ny.us wrote:
> Lower my home heating oil prices and we'll tell you. ;)
>
> --
> "They don't think it be like it is, but it do."
>
> Oscar Gamble, NY Yankees
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>

--
BP Amoco
Exploration
Upstream Technology Group



Sent via Deja.com http://www.deja.com/
Before you buy.
Re: Flame velocity in explosion [message #18771 is a reply to message #18637] Thu, 27 January 2000 00:00 Go to previous message
wbiagiot is currently offline  wbiagiot
Messages: 59
Registered: January 1999
Member
Lower my home heating oil prices and we'll tell you. ;)

--
"They don't think it be like it is, but it do."

Oscar Gamble, NY Yankees


Sent via Deja.com http://www.deja.com/
Before you buy.
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