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45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
5 years ago
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c--------------------------------------------------------rise_fall_vel
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subroutine rise_fall_vel(vv)
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c--------------------------------------------------------------------c
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c vv > 0 : rise and vv < 0 : fall vv = 0.0 : nuetral c
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cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
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c This program is to assign a velocity to one of the c
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c sewage particles which have various sizes and densities and c
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c paricle size and density are uniformly distributed among c
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c the particles c
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cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
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c
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c yo and y1 are coefficients of speed regression equation
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c which has form 10.0**((m-y0)/y1)
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c particles which fall have possitive velocity
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c particles which rise have negantive velocity
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c
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cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
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c
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include 'rise_fall.cb'
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REAL rnumb, vv, ran3, fspe, rspe
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common /randm/isd,isd1
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INTEGER isd,isd1
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c
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rnumb=100.0*ran3(isd)
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vv=0.0
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c
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if(rnumb.le.rf) vv=fspe(rnumb)
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if(rnumb.ge.(100.0-rr)) vv=rspe(rnumb)
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return
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end
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function fspe(rnumb)
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include 'rise_fall.cb'
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real fspe, rnumb
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fspe=-10.0**((rnumb-y0f)/y1f)/3600.0
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return
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end
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function rspe(rnumb)
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include 'rise_fall.cb'
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real rspe, rnumb
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rspe=10.0**(((100.0-rnumb)-y0r)/y1r)/3600.0
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return
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end
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