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From: Fadel Khalifah Ibrahim
Date: Tue, 16 Oct 2018 06:53:11 +0700
Message-ID:
Subject: Re: HEC-RAS unstable WSE_ EG over height
To: [email protected]
Content-Type: multipart/alternative; boundary=”00000000000095ec6b05784d2452″

–00000000000095ec6b05784d2452
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Thank you very much Scott. That’s right the model is 1D. Actually i would
like to make 2D model. but first, i started from 1D model and then continue
to 2D. I set unsteady model and running for 3 days.
the initial flow that I use seems very influential. as an example. if I use
the value 5. The model will immediately error. If I use 40, it will error
too, but if I use 36 (recently), the flow will tend to be stable.

As information a few meters before the downstream, there is a downstream
that is quite steep, but sometimes the results of the model will be fine.
when I change the hydrograph, the flow model will then tend to be error.
Overall, the geometry of the river has no significant contraction and
expansion and the too steep cross section. I confused what should i do now.

Best regards.

*FADEL KHALIFAH IBRAHIM, S.T.*
ENVIRONMENTAL AND CIVIL ENGINEER

On Tue, Oct 16, 2018 at 6:11 AM Scott Miller [via HEC-RAS Help] < [email protected]> wrote:

> The model is 1D only, right? What are the low end flows? How long does it
> run in model time? How well does the initial flow match the first flows t=
o
> enter the reach?
>
> The steep downstream end may be contributing to instability. If the model
> runs for long enough to output a few minutes of data, take a look at what
> the profile does during that time.
>
> ——————————
> If you reply to this email, your message will be added to the discussion
> below:
>
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ight-tp6516p6522.html
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–00000000000095ec6b05784d2452
Content-Type: text/html; charset=”UTF-8″
Content-Transfer-Encoding: quoted-printable

Thank you very much Scot=
t. That's right the model is 1D. Actually i would like to make 2D model=
. but first, i started from 1D model and then continue to 2D. I set unstead=
y model and running for 3 days.=C2=A0

the initial flow that I use =
seems very influential. as an example. if I use the value 5. The model will=
immediately error. If I use 40, it will error too, but if I use 36 (recent=
ly), the flow will tend to be stable.

As informati=
on a few meters before the downstream, there is a downstream that is quite =
steep, but sometimes the results of the model will be fine. when I change t=
he hydrograph, the flow model will then tend to be error. Overall, the geom=
etry of the river has no significant contraction and expansion and the too =
steep cross section. I confused what should i do now.=C2=A0

<= /div>

Best regards.

x 0px 40px;border:none;padding:0px">

=
FADEL KHALIFAH IBRAHIM, S.T.

ENVIRONMENTAL AND CIVIL ENGINEER

=

=

On Tue, Oct 16, 2018 at 6:11 AM=
Scott Miller [via HEC-RAS Help] <[email protected]> wrote:

=

x #ccc solid;padding-left:1ex">

The model is 1D only, right? What are the low end flows? How long does it =
run in model time? How well does the initial flow match the first flows to =
enter the reach?

The steep downstream end may be contributing to instability. If the=
model runs for long enough to output a few minutes of data, take a look at=
what the profile does during that time.

=09
=09
=09

---

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

http://hec-ras-help.109=
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=09
To unsubscribe from HEC-RAS unstable WSE_ EG over height, click here.
NAML

–00000000000095ec6b05784d2452–

[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.

[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]

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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:

=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd= ing-left:1ex">

What are you using for your weir coefficients?=20

=09
=09
=09

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[DEL]

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

[DEL]

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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.
>
> ——————————
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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

---

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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
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