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Algorithms

 
QuestionSeeking A Solution Pin
Roger Wright21-Jun-10 16:40
professionalRoger Wright21-Jun-10 16:40 
AnswerRe: Seeking A Solution Pin
Dr.Walt Fair, PE21-Jun-10 17:12
professionalDr.Walt Fair, PE21-Jun-10 17:12 
GeneralRe: Seeking A Solution Pin
Roger Wright21-Jun-10 17:30
professionalRoger Wright21-Jun-10 17:30 
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Luc Pattyn21-Jun-10 19:00
sitebuilderLuc Pattyn21-Jun-10 19:00 
GeneralRe: Seeking A Solution Pin
kenfry1322-Jun-10 14:57
kenfry1322-Jun-10 14:57 
GeneralRe: Seeking A Solution Pin
Luc Pattyn22-Jun-10 15:04
sitebuilderLuc Pattyn22-Jun-10 15:04 
GeneralRe: Seeking A Solution Pin
Dr.Walt Fair, PE22-Jun-10 4:44
professionalDr.Walt Fair, PE22-Jun-10 4:44 
GeneralRe: Seeking A Solution Pin
Roger Wright22-Jun-10 5:10
professionalRoger Wright22-Jun-10 5:10 
I was thinking perhaps a cubic spline solution...

The variables are part of the equation for fluid flow in a pipe, and Φ represents the angle from horizontal a line drawn from the center of the pipe to the intersection of the line marking the top of the fluid within.

V = (1.485/n)* R2/3 * S1/2, ft/sec.

S is the slope of the pipe, and n is a very small number that varies with the smoothness of the pipe - a common value is .013. R is called the 'hydraulic radius' and is given by the ratio of the area of flow to the wetted perimeter in the pipe. Calculating that area value is what hurts my head.

It's fairly straightforward to calculate the flow, given everything else, but I'm trying to predict a level in the pipe from a given flow and slope. That's not what the equation is designed for, though there's no reason not to use it this way. If I can't find a reasonable way to do it, I may have to resort to Bernoulli's equation, with all those nasty energy calculations and differential equations. We hates those...Suspicious | :suss:
"A Journey of a Thousand Rest Stops Begins with a Single Movement"

GeneralRe: Seeking A Solution Pin
Luc Pattyn22-Jun-10 6:31
sitebuilderLuc Pattyn22-Jun-10 6:31 
GeneralRe: Seeking A Solution Pin
Dr.Walt Fair, PE22-Jun-10 7:24
professionalDr.Walt Fair, PE22-Jun-10 7:24 
GeneralRe: Seeking A Solution Pin
Roger Wright22-Jun-10 8:23
professionalRoger Wright22-Jun-10 8:23 
GeneralRe: Seeking A Solution Pin
Dr.Walt Fair, PE22-Jun-10 8:54
professionalDr.Walt Fair, PE22-Jun-10 8:54 
GeneralRe: Seeking A Solution Pin
Luc Pattyn22-Jun-10 9:42
sitebuilderLuc Pattyn22-Jun-10 9:42 
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harold aptroot22-Jun-10 6:17
harold aptroot22-Jun-10 6:17 
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Luc Pattyn22-Jun-10 6:29
sitebuilderLuc Pattyn22-Jun-10 6:29 
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harold aptroot22-Jun-10 6:39
harold aptroot22-Jun-10 6:39 
GeneralRe: Seeking A Solution Pin
Roger Wright22-Jun-10 17:24
professionalRoger Wright22-Jun-10 17:24 
GeneralRe: Seeking A Solution Pin
harold aptroot22-Jun-10 23:34
harold aptroot22-Jun-10 23:34 
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Luc Pattyn23-Jun-10 2:43
sitebuilderLuc Pattyn23-Jun-10 2:43 
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cp987623-Jun-10 14:21
cp987623-Jun-10 14:21 
GeneralRe: Seeking A Solution [modified] Pin
Roger Wright23-Jun-10 20:01
professionalRoger Wright23-Jun-10 20:01 
GeneralRe: Seeking A Solution Pin
cp987623-Jun-10 21:28
cp987623-Jun-10 21:28 
GeneralRe: Seeking A Solution Pin
harold aptroot23-Jun-10 21:48
harold aptroot23-Jun-10 21:48 
GeneralRe: Seeking A Solution Pin
cp987624-Jun-10 1:08
cp987624-Jun-10 1:08 
GeneralRe: Seeking A Solution Pin
cp987624-Jun-10 1:22
cp987624-Jun-10 1:22 

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