# Water on particular particular sections are not visible

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May 23, 2024, 03:00
Water on particular particular sections are not visible
#1
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kyla
Join Date: May 2024
Posts: 13
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Supposedly, the water should flow throughout the channel. But in the result, the water seems to be gone on some sections. What do you think the reason behind this?
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 May 28, 2024, 14:03 #2 Member   Sehroosh Join Date: Apr 2019 Location: Pakistan Posts: 59 Rep Power: 7 Is the slope of channel is same for whole reach ? If yes either the slope is more or less than critical slope ?

 May 28, 2024, 21:45 #3 New Member   chelsey Join Date: Feb 2024 Posts: 4 Rep Power: 2 same problem Last edited by heyzel; May 29, 2024 at 00:12.

May 29, 2024, 00:13
#4
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kyla
Join Date: May 2024
Posts: 13
Rep Power: 2
Quote:
 Originally Posted by MSM1985 Is the slope of channel is same for whole reach ? If yes either the slope is more or less than critical slope ?
@Sehroosh Thanks for the response.
No, the slope of the channel varies. I've noticed that the water usually disappears in sections with steeper slopes. Is there a way I can solve this?

 May 29, 2024, 00:49 #5 Member   Sehroosh Join Date: Apr 2019 Location: Pakistan Posts: 59 Rep Power: 7 Steeper slopes means lesser depth and higher velocity. In the steeper slope areas, you need to refine the mesh in such a manner that your mesh size is smaller than your anticipated flow depth. If your mesh have atleast 3 cells in your anticipated flow depth, this issue will be resolved.

May 29, 2024, 01:03
#6
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kyla
Join Date: May 2024
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Quote:
 Originally Posted by MSM1985 Steeper slopes means lesser depth and higher velocity. In the steeper slope areas, you need to refine the mesh in such a manner that your mesh size is smaller than your anticipated flow depth. If your mesh have atleast 3 cells in your anticipated flow depth, this issue will be resolved.
Great! Thank you so much for your response. I'll try to change the mesh size to improve the results. Thanks again!

May 29, 2024, 03:32
#7
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Join Date: Jun 2014
Location: Turkey
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Quote:
 Originally Posted by kylas Supposedly, the water should flow throughout the channel. But in the result, the water seems to be gone on some sections. What do you think the reason behind this?
Hi.

Mesh resolution is important bu It is also a visualisation problem. These areas have fluid and solver solves it. Bu the default isosurface value is 0.5. If any cell has fluid fraction below 0.5, it does not shown at render images. You can reduce this value from Results section. It should be something like "contour value". you can delete "Auto" and type 0.2 or 0.1

May 29, 2024, 03:51
#8
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kyla
Join Date: May 2024
Posts: 13
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Quote:
 Originally Posted by koful Hi. Mesh resolution is important bu It is also a visualisation problem. These areas have fluid and solver solves it. Bu the default isosurface value is 0.5. If any cell has fluid fraction below 0.5, it does not shown at render images. You can reduce this value from Results section. It should be something like "contour value". you can delete "Auto" and type 0.2 or 0.1
This! Thank you so much for this tip. Super helpful, I solved the problem in a minute. Thanks a lot!

 Tags animation, flow 3d, flow 3d hydro, flow 3d post, spillway

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