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Hi everyone,

I have the following problem, I have a straight channel, with subcritical flow, initial flow rate of 0.075 m3 / s (boundary 455), depth output condition of 0.0804 m (boundary 544). I use for friction the equation of manning with coefficient of 0.01197. In the initial section a great increase in depth occurs (picture "Section_initial"), I do not understand why this happens.

thanks

Hi
what is the initial water level?

Hi c.coulet

Initially use 0.024 on the entire channel, then use 0.09 which is the normal height obtained by manning. He also got the same error.

Add previous post:

Discretise a little more PRINTOUT PERIOD and you can see that before step 47 was normal but from step 52 a disturbance starts and it generates what is in the image.

Also, use an lqd file for a smoother entry and an initial height of 0.09 and the same thing is still happening.

Hello again,

I still do not have a solution to the problem, but trying to put the option "OPTION FOR LIQUID BOUNDARIES" the thomson condition in the input and there is no alteration in the beginning. I do not know how good it is to use this condition in this case.

Attach results in link google drive

Joaquin

drive.google.com/a/alumnos.usm.cl/file/d...bU0/view?usp=sharing

Hello Joaquin

It is not possible to download your result files. Google drive asks for a permission.
There is something that I do not understand in your model and I need your files to check it up.
last thing, please try with finite volumes to see if results will get better.

with my kind regards

Riadh ATA

Okay, it's already updated.
Thanks Riadh