1D/2D FLOW ERROR. BUT THE COMPUTATION MESSAGES IS STILL RUNNING

[DEL]

Hello Everybody….

I tried to make 1D model which was developed 2D model. The massages list as follows. Maybe there is somebody could be help me.
……..
13MAR2014 19:38:55 1D/2D Flow error 256. Citarum All Ri Citarum All Re 103347
13MAR2014 19:39:05 Citarum All Ri2 Citarum All Re2 102 631.47 0.801
13MAR2014 19:39:05 Perimeter 1 Cell # 556 666.82 0.0159 1
13MAR2014 19:39:00 1D/2D Flow error -19265. Citarum All Ri2 Citarum All Re2 6685
13MAR2014 19:39:10 Citarum All Ri2 Citarum All Re2 102 631.47 0.777
13MAR2014 19:39:10 Perimeter 1 Cell # 874 665.27 11.2117 2
13MAR2014 19:39:05 1D/2D Flow error 346. Citarum All Ri Citarum All Re 103347
13MAR2014 19:39:15 Citarum All Ri2 Citarum All Re2 102 631.47 0.753
13MAR2014 19:39:15 Perimeter 1 Cell # 491 665.96 1.6099 2
13MAR2014 19:39:10 1D/2D Flow error 34350. Citarum All Ri2 Citarum All Re2 6685
……

The computation is still process.. but so slowly. What’s the meaning? Thanks..

[Scott Miller]

1D/2D errors are normal. It is the flow that does not pass between the areas, and will cause a difference in water surface elevation. By default there are no iterations across the 1D/2D boundary. The magnitude of the flow error can be reduced by adding iterations. A threshold for acceptable flow error can also be set.

2D can be very slow. Provide more information about how your model is configured – maybe a detail of the geometry.

[DEL]

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In-Reply-To: <[email protected]>
From: Fadel Khalifah Ibrahim
Date: Sat, 4 Aug 2018 05:17:43 +0700
Message-ID:
Subject: Re: 1D/2D FLOW ERROR. BUT THE COMPUTATION MESSAGES IS STILL RUNNING
To: “Scott Miller [via HEC-RAS Help]”
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Thank you for your response. But before i have set the maximum iteration
between 1D and 2D=3D20. The result is same.

On Sat, 4 Aug 2018 3:46 am Scott Miller [via HEC-RAS Help], < [email protected]> wrote:

> 1D/2D errors are normal. It is the flow that does not pass between the
> areas, and will cause a difference in water surface elevation. By default
> there are no iterations across the 1D/2D boundary. The magnitude of the
> flow error can be reduced by adding iterations. A threshold for acceptabl=
e
> flow error can also be set.
>
> 2D can be very slow. Provide more information about how your model is
> configured – maybe a detail of the geometry.
>
> ——————————
> If you reply to this email, your message will be added to the discussion
> below:
>
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ATION-MESSAGES-IS-STILL-RUNNING-tp6040p6041.html
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Thank you for your response. But before i have set the ma=
ximum iteration between 1D and 2D=3D20. The result is same.=C2=A0

=

On Sat, 4 Aug 2018 3:46 am Scot=
t Miller [via HEC-RAS Help], <[email protected]> wrote:

1D/2D errors are normal. It is the flow that does not pass between the are=
as, and will cause a difference in water surface elevation. By default ther=
e are no iterations across the 1D/2D boundary. The magnitude of the flow er=
ror can be reduced by adding iterations. A threshold for acceptable flow er=
ror can also be set.

2D can be very slow. Provide more information about how your model =
is configured – maybe a detail of the geometry.

=09
=09
=09

---

If you reply to this email, your message =
will be added to the discussion below:

http://hec-ras-help.1091112.n5.nabble.com/1D-2D-FLOW=
-ERROR-BUT-THE-COMPUTATION-MESSAGES-IS-STILL-RUNNING-tp6040p6041.html

=09
To unsubscribe from 1D/2D FLOW ERROR. BUT THE COMPUTATION MESSAGES IS STI=
LL RUNNING, click here.
NAML

–000000000000f7030a05728f4cdf–

[DEL]

as information the distance between cross sections is 15-30 meters. Is that too solid?

[cameron]

What are you using for your weir coefficients?

[DEL]

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From: Fadel Khalifah Ibrahim
Date: Sun, 5 Aug 2018 01:47:59 +0700
Message-ID:
Subject: Re: 1D/2D FLOW ERROR. BUT THE COMPUTATION MESSAGES IS STILL RUNNING
To: “cameron [via HEC-RAS Help]”
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I used 1.43 for all lateral structures

On Sat, 4 Aug 2018 9:34 pm cameron [via HEC-RAS Help], < [email protected]> wrote:

> What are you using for your weir coefficients?
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I used 1.43 for all lateral structures

On Sat, 4 Aug 2018 9:34 pm cameron [via =
HEC-RAS Help], <m=
[email protected]> wrote:

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What are you using for your weir coefficients?=20

=09
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[cameron]

One thing that will make the iteration go away is if you switch to the 2D solver instead of the weir equation, but you need to be careful when doing that.

Does that weir coefficient make sense for you model? Check the manual that lists values to use.

You could also adjust the lengths of the lateral structures by breaking it up into more sections.

[DEL]

Yes i does. I have check manual list value for weir coefficient. But it’s not works. For lateral inflow, i haven’t adjust to break lateral structures in to more sections. i will try it. but before it, Does, it has some length criteria to break it down?

Thank you so much cameron.

[DEL]

As information i have been make 2D model from 1D model. But the results is same.
Those link picture is computational messages during my model. I had been broke down the lateral structure into several segment (3-3.5 km/segment). May be there is somebody that has same problems. Thank you very much.

[DEL]

As information i have been make 2D model from 1D model. But the results is same.
Those link picture is computational messages during my model. I had been broke down the lateral structure into several segment (3-3.5 km/segment). May be there is somebody that has same problems. Thank you very much.

[Author]

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