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hydrograph(B60) and Average velocity of initial section |
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November 10, 2021, 08:33 |
hydrograph(B60) and Average velocity of initial section
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#1 |
New Member
yangshihang
Join Date: Mar 2021
Location: hangzhou,china
Posts: 3
Rep Power: 5 |
I found that when average velocity of initial section (discharge)is higher ,the program will not go on.
For example ,when average velocity is 0.5 m/s, it goes well.when average velocity is 2.0 m/s, it stops emergently, in a few seconds(0.5~4 second). I think i need "hydrograph.dat",help me to make water changes smothly. So please give me an example. AND here my text. control C 11 1 C 12 3 C 13 3 C 14 2 C 15 3 C 16 3 B 2 700 1 170 B 10 0.0 30.0 0.0 0.05 0.0 6.0 B 101 8 B 121 250 12.5 200 17.5 250 B 103 8 B 123 30 1.5 100 4.0 40 G 10 1 G 15 2 G 20 0 G 31 14 M 10 6 M 20 2 O 32 15 2.48 0.4 ctrl B 10 1 B 50 0.0001 B 60 1 B 61 3 B 75 1 D 10 4 D 20 2 D 30 1 F 30 3 F 40 3 F 42 6.0 F 50 4 F 60 4.5 G 50 1 N 10 14 N 11 11 N 40 3 N 41 240 N 47 1.5 N 48 1 M 10 6 P 10 1 P 24 1 P 28 1 P 30 0.1 I 12 0 S 10 1 S 11 1 S 12 1 S 13 1 S 15 0 S 16 3 S 20 0.0030 S 24 0.5 S 30 0.004 S 41 2 S 42 2 S 45 40 S 46 1 S 50 3 S 60 0 S 71 5 S 72 25 S 77 3 26 S 80 0 S 90 1 S 91 2 T 10 2 T 36 2 W 10 0.25 (I only change here 0.05 or 0.25) W 22 -9.81 AND here is my picture of different discharge,first one is result of (W 10 0.25);last one is result of (W 10 0.05) |
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November 10, 2021, 22:27 |
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#2 |
Member
Ismael Incoencio
Join Date: Sep 2021
Posts: 45
Rep Power: 6 |
Maybe it's not a question of the velocity, but of the WSE hitting the top of your domain. You screenshot for Q=0.25 shows it's already dangerously close to the top wall. Any increase in discharge would likely result in a deeper flow.
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November 12, 2021, 01:23 |
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#3 |
Member
Ismael Incoencio
Join Date: Sep 2021
Posts: 45
Rep Power: 6 |
On a related note, have you gotten the hydrograph.dat to work? I can't seem to get it running.
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November 12, 2021, 04:23 |
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#4 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 377
Rep Power: 17 |
Hi Yangshihang,
I think your inflow velocity is very high for this case, are you sure about the discharge? What helps is to avoid the initial inflow surge by using I 10 1, which will initialize the whole domain with a potential flow solution. This seems to work, see attachment. |
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Tags |
reef3d;average velocity |
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