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Dear all,

I am currently repeat the Guenter-experiment, I found that the velocity and depth in outlet is very unstable. The elevation of the outlet is exactly the same with the measurement.

So, any suggestions for reduce the fluctuation in the canal ?





Best Regards

The computation domain is 40 x 1 m. the *.liq, and *.cas are as follows:

Hello,

the steering file seems very ok. Some comments:
- first I would test with a lower time step. Have a look at your Courant numbers.
- try to set the initial elevation value equal to the prescribed elevation value
- the roughness of your lateral boundaries seems very high for a flume test case. Do you have such rough side walls?
- The liquid boundary file is missiing in your post.
Increase the inflow gradually from zero in the liquid boundary file using a ramp function to a steady inflow

Hope something helps.
Clemens

Dear Konsonaut,

Thanks, my problem has been solved, It is the problem of the time steps and the mesh quality. I make a fine mesh and the reduce the time steps. Than it is OK.

Best regards

Harryyap