| Flame velocity in explosion [message #18637] |
Wed, 26 January 2000 00:00  |
shearerm
Messages: 11
Registered: July 1999
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Junior Member |
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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  |
wbiagiot
Messages: 59
Registered: January 1999
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Member |
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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
Sent via Deja.com http://www.deja.com/
Before you buy.
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