[M. L. Harris]

Hi and thanks! Is this documented in any of the RAS manuals? Or do you know this from experience?

[M. L. Harris]

Hi! Do you happen to know if the velocity at the face is the instantaneous velocity at the output time, or the averaged velocity over the time since the last output?

[M. L. Harris]

Thank you jarvus, your response helps confirm what I thought. I’ve been meaning to dig in to the RAS Controller – this is a good opportunity to do so. 🙂

[M. L. Harris]

What if you set the Manning’s roughness value to something unreasonably high for the grid cell or region?

Another thing I have done in 2D flow areas is to “superimpose” the buildings themselves onto the terrain so that they act as physical obstructions to flow.

[M. L. Harris]

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Subject: RE: Connecting 2D flow area and 1D reach
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Sure! Which email should I use?

From: cameron [via HEC-RAS Help]
Sent: Saturday, April 6, 2019 11:44 PM
To: Harris, Maureen
Subject: Re: Connecting 2D flow area and 1D reach

Looks like some instabilities. If you sent me the model I could play with i=
t.

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Sure! Which email should I use?

 

From: cameron [via HEC-RAS Help] <ml+s=
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Sent: Saturday, April 6, 2019 11:44 PM
To: Harris, Maureen <[email protected]>
Subject: Re: Connecting 2D flow area and 1D reach

 

Looks like some insta=
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[M. L. Harris]

I did, and frustratingly, the issue jumped the to next downstream 1D XS as well.

Velocity is mapped in these figures.

[M. L. Harris]

Hi Scott, these are great suggestions. I have not tried all of these yet, but will.

I am currently using v5.0.7 defaults for water surface and volume tolerance. Maximum xsec wsel is 0.054 for my latest run; this occurred two XS’s downstream of my 1D/2D interface. At the interface, terrain and Manning’s n are identical.

I am currently running steady flows to troubleshoot this issue, so the problem is persistent throughout the run (currently 36 hrs at 1 sec timestep). I am using a 12 hour initial conditions time and a ramp up fraction of 0.7.

I will try FM next to see how the model behaves. Here are maps of velocity and Courant. Thanks again for your response.

[M. L. Harris]

Hi, I have experimented with max 1D/2D iterations and have set it as high as 20 but the problem still persists.

Some other tests I have tried:

– Reduce grid cell size at 1D/2D interface (gradually decreased from 25’x25′ to 10’x10′ at interface)
– Decrease computation time step (tested time steps ranging from 5 sec down to 1 sec)
– Added warm up period
– Modified Manning’s n at interface
– Moved 1D/2D interface to next downstream XS in 1D reach
– Tested different initial conditions (use of .rst file versus initial flow versus initial conditions ramp up)

I have not yet experimented with time slicing, and have only run Diffusion Wave, not Full Momentum.

[M. L. Harris]

Thank you for the response and advice, very appreciative!

I’ve only been running 2D in DW and not FM (I’ve been hesitant to try FM in light of the issues I’m having ).

I tried moving the d/s end of my 2D area to the next 1D XS downstream but interestingly the problem propagated itself downstream – look at that velocity spike!

I’ve considered scrapping the 1D domain and extending the 2D area downstream (WSE doesn’t reach the bridge decks in the events I’m simulating); but, it could take quite an effort to get the abutments and piers accurately represented in the terrain…

[M. L. Harris]

I’m experiencing a similar problem. Were you able to find a resolution?

[Author]

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