TELEMAC-MASCARET Forum: downstream boundary condition (2/2)

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TOPIC: downstream boundary condition

downstream boundary condition 4 years 3 months ago #36480

doggo3
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Posts: 12

Yes, I did.

But I've never done with (555).

Again,

relaxation factor= 0.5
PRESCRIBED FLOWRATES = -3519.d0;587.d0;2932.d0;0.d0
hot start

================================================================================
 ITERATION    30600    TIME:    1 D  0 H 51 MN   0.0000 S   (    89460.0000 S)
 LIQUID BOUNDARY: Q(2)     =   587.00000000000000
 LIQUID BOUNDARY: Q(2)     =   586.99999999999989
 LIQUID BOUNDARY: Q(3)     =   2932.0000000000000
 LIQUID BOUNDARY: Q(3)     =   2932.0000000000000
 LIQUID BOUNDARY: Q(4)     =   0.0000000000000000
 LIQUID BOUNDARY: Q(4)     =   0.0000000000000000
--------------------------------------------------------------------------------
                          ADVECTION STEP
--------------------------------------------------------------------------------
                    DIFFUSION-PROPAGATION STEP
 EQUNOR (BIEF) :        4 ITERATIONS, RELATIVE PRECISION:   0.7268166E-03
--------------------------------------------------------------------------------
                       BALANCE OF WATER VOLUME
     VOLUME IN THE DOMAIN :   0.1219461E+08 M3
     FLUX BOUNDARY    1:     24304.32     M3/S  ( >0 : ENTERING  <0 : EXITING )
     FLUX BOUNDARY    2:     587.0000     M3/S  ( >0 : ENTERING  <0 : EXITING )
     FLUX BOUNDARY    3:     2932.000     M3/S  ( >0 : ENTERING  <0 : EXITING )
     FLUX BOUNDARY    4:    -0.000000     M3/S  ( >0 : ENTERING  <0 : EXITING )
     RELATIVE ERROR IN VOLUME AT T =       0.8946E+05 S :    0.3779532E-05

Q1 shows the inflow.

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downstream boundary condition 4 years 3 months ago #36485

doggo3
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Posts: 12

I noticed from this advice that if VELOCITY PROFILES = 4(instead of 5), I can get no errors at BC(2)(3) even if the relaxation factor = 0.02.
Then I could get a reasonable Q(1) and H(1) with liquid boundary:[4 4 4] (not [5 5 5]).

I can't make use of the rating curve yet,and can't understand the differences between the manual description of [444] and [555] nor formula used in [444].
But Free HQ BC is working now, so I can take the next step.

Thanks.

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