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Initial water level changes with no prescribed flow in domain for all CFL numbers

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Old   October 13, 2021, 03:13
Default Initial water level changes with no prescribed flow in domain for all CFL numbers
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Dear Hans,

I test a case of still water tank with all closed boundaries to check the stability of the model. However, as you will see in attached figures, at different time steps, the water level drops with progressing time, irrespective of CFL number used. I expect no change in water level with no flow prescribed on the boundaries (all walls). You can also check the simulation 'ctrl.txt' and 'control.txt' attached. Could you please have a look and let me know if we can change any numerical parameters to avoid this?

Thanks!
Attached Images
File Type: png Model set.png (13.3 KB, 7 views)
File Type: jpg 0.01s.jpg (55.4 KB, 6 views)
File Type: jpg 10.00s.jpg (61.9 KB, 8 views)
Attached Files
File Type: txt control.txt (96 Bytes, 0 views)
File Type: txt ctrl.txt (223 Bytes, 1 views)
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Old   October 13, 2021, 04:57
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For this, you need to start the simulation with I 12 1. This will initialize the pressure to its hydrostatic distribution. Then the free surface will remain in place.
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Old   October 13, 2021, 05:33
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Thanks Hans, I will try this and get back to you!
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Old   October 13, 2021, 22:49
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Hi Hans, this option worked well. Thanks again!
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