1D/2D Rules

[Anonymous]

All, Quick question…

Can a 1D reach be connected upstream AND downstream to the SAME 2D area?

For example, a 2D area that wraps around a 1D reach so that both its upstream cross section is connected to the 2D area and the downstream cross section cross section is connected to the 2D area.

[Anonymous]

With some testing at a small scale, i have discovered that this is true.

A 2D area can NOT be connected to both the US and DS ends of the same reach. The software seems to be confused with the initial conditions. Hope this helps someone out in the future

[cameron]

You would have to have a gap between the two connections of at least 1 grid cell I believe. You would connect the upstream end of the channel to the 2D one way and then use lateral structures for each side.

The figure below shows a crude example

[Anonymous]

Thanks Cameron, I actually have the US reach connected to, lets say for naming conventions, area “1-2D” which wraps around the ROB which is connected to the same via lateral structures, then the DS same reach connected to that same area 1-2D.

Then the LOB is connected to area 2-2D via lateral structures.

This was not allowed for me. I had to alternate the DS reach to connect to area 2-2D. This was the only way it would run. I tried this at a large scale model and a very small scaled model to see if what was occuring could be duplicated at a more simple level

I would try and upload an image but i have already adjusted the geometry.

[Author]

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