Rendition of Particle Tracing at 1D/2D Boundary

[Scott Miller]

In the figure below a tributary is shown contributing flow from the upper right. At the lateral structure, which dips to match the topography across the channel, traced particles are not shown entering the 1D reach. The traced particles bend toward the lower right, toward the downstream cross-section. Is this something I should be concerned about? Or is it just a peculiarity about the rendition?

On a second matter, the geometry shown in the image has an interpolated cross-section positioned right on the alignment of the tributary. It is there to support 1D stability, but its left bank does not lie down in the tributary channel. It is higher. Would this limit flow from the tributary from entering the 1D reach, or would the low lying lateral structure deliver flow the the 1D reach anyway?

The particle tracing makes its bend even if the interpolated cross-section is not there.

[Anonymous]

To answer the second question first: the left overbank will not prevent flow from the lateral structure. If the water is higher than the lateral structure, you should get flow regardless of the overbank height..

Your velocity plot prompted me to look more closely at some of my data sets. Using 5.0.4, the particle tracing looks good if I use the weir equation. If I use the 2D domain, it does not. However, the water volume is clearly being transferred from the 2D to the 1D at the correct location and, as far as I can tell, at an appropriate amount.

So it may well be that it just something that is not being rendered correctly for output.

[Scott Miller]

Thank you. In the figure the lateral structure is using normal 2D calculations.

[Anonymous]

5.0.5 appeared to fix this. At least for my data set.

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