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## Grid Problems on NaysCUBE

• Mar 02 2023

Hi, I’m currently exploring the river and the iRic NaysCUBE application, I want to ask about a problem that I encountered, I modeled a 2000 m long river, when I modeled it in the application; First, I made a grid by accident (what I mean here is that I just follow the flow of the river, then make distances for the riverbanks to the right and left and not follow the river in too much detail), I run it with a discharge of 2200 m3/s, the results are in accordance with the conditions in the field and in sufficient criteria.

Then the second, I make a grid carefully following the distance of the bank, the river flow is good or in other words more detailed, and I run it with a flow rate of 2200 m3/s. But I got different results from the first and the second, where the second gave illogical results such as lower speed values, unreasonable depths.

With that in mind, where is the error? how should the grid be on the iRic model? (For the details, i have attached the example model I’m working on right now

Thank you, I’m really waiting for a good review from you
Regards.

1.jpg
iRIC does not ensure the safety of the attached file.

### コメント

1. pritikumaricetpa says:

NaysCUBE is an unsteady fully three-dimensional solver for river flow and bed morphodynamics written by Professor Ichiro Kimura of Toyama University. The approach solves the basic equations of three-dimensional flow incorporate the nonhydrostatic water pressure associated with strong vertical accelerations and velocities. The user can choose from a variety of turbulence closures including a non-isotropic higher-order k-ε treatment. This solver can simulate fully three-dimensional flow phenomena, such as the secondary current of the first second kind, the horseshoe vortex around river structures, as well as the associated bed morphodynamic features. This solver covers a wider range of phenomena compared with 2D models, although it requires one-order (or more) larger CPU time. Therefore, this solver is suitable to be applied on a limited river reach for detailed analysis.
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2. Ichiro says:

Is it possible to send me the ipro file in the second case? I will run an check it.

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