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[DesignModeler] Creating Bottom Layer of Sediment in 2D Sand Trap Model

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Old   July 3, 2020, 08:40
Default Creating Bottom Layer of Sediment in 2D Sand Trap Model
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Mads Ivarson
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Hello!

I am trying to find ways to reduce the flow of sediment into a turbine, and I am therefore trying to simulate how a layer of sand behaves in the sand trap upstream of the penstock.

The simulation is 2D, and my idea is to use sketching to create a zone from the bottom up to a certain height which i can later initialize as sand in some way. Though I have not figured out how to differentiate this zone from the rest of the geometry when I create surface from geometry.

I have also seen that you can declare horizontal rectangles that will be sand in the setup part, however, the sandtrap I am simulating has a slight incline. Therefore I cannot figure how to declare the bottom as sand in 2D.

I will attatch an imgur folder of pictures of my model.
https://imgur.com/a/dBACAQb

The length of the sand trap is approximately 160m, height 11m, U = 2m/s.
The many small rectangles represent beams installed to try and reduce the water's effects on the sediment.

Any help is appreciated!
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Old   July 7, 2020, 02:17
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Gwenael H.
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Hello Mads,

Well you can simply split your surface in Design Modeller using the frozen/slice options. You can use edges, or planes (with whatever angle you want) to create a slice. The trick at the end is to regroup the different sub-surfaces into a part > select all the surface you need > rmb > form new part.

Have fun
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Old   July 8, 2020, 04:54
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Thanks for the reply!
I tried slicing the surface, however nothing happens when i press Generate. I get a warning saying that no solid bodies were created from the slice. The guides for using the Slice tool are all for 3D models. Does Slice work for my 2D model?
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Old   July 9, 2020, 03:31
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Hello Mads,

Did you check that your bodies were "frozen" before performing the slicing ? If not you need either when you generate your surfaces to change the option "add material" to "add frozen" or insert a "freeze" and select the surfaces of interest.

The slice option works perfectly also for 2D surfaces. I made a detailed post quite some time (8 years to be precise) for a U-bend 2D geometry going though the slicing process:

U-bend Mesh in ANSYS

Have fun
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Old   July 13, 2020, 05:09
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Thanks for the feedback! After reading your detailed guide, I went through my own model, I realized I sliced through a plane that didnt intersect with my model. My mistake, but I learned from it!
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Old   July 16, 2020, 04:09
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Great to hear, and good to see that old posts are useful
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