[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?

[MSM1985]

Is the slope of channel is same for whole reach ? If yes either the slope is more or less than critical slope ?

[heyzel]

same problem

[kylas]

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?

[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.

[kylas]

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!

[koful]

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

[kylas]

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!