Re: Dam Breach Model using 2D in HEC-RAS 5.0.3: 1D/2D Flow Error Message

[Kinagoto]

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From: Kinagoto Nanadoum
Date: Mon, 23 Jan 2017 21:38:00 -0500
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Subject: Re: Dam Breach Model using 2D in HEC-RAS 5.0.3: 1D/2D Flow Error Message
To: “cameron [via HEC-RAS Help]”
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Hello Cameron,

I am running a dam beach simulation on a very long reach, about 18 miles.
My desktop is not power enough to run the simulation faster (3 to 5 hours)
including warm up time. Are you aware of any free or cheap fast web super
computing possibility?
Thanks,
Nan
On Jan 5, 2017 10:01 AM, “cameron [via HEC-RAS Help]” < [email protected]> wrote:

> This message is stating that there is an error of that much flow across
> your 1D/2D connection. To fix this, you either need to adjust the
> connection or increase the 1D/2D iterations to 20 if not done so already.
>
> ——————————
> If you reply to this email, your message will be added to the discussion
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> Model-using-2D-in-HEC-RAS-5-0-3-1D-2D-Flow-Error-Message-tp3480p3485.html
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Hello Cameron,

I am running a dam beach simulation on a very long reach, ab=
out 18 miles. My desktop is not power enough to run the simulation faster (=
3 to 5 hours) including warm up time. Are you aware of any free or cheap fa=
st web super computing possibility?
Thanks,
Nan

On Jan 5, 2017 10:01 AM, "cameron [via HEC-=
RAS Help]" <[email protected]> wrote:

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

This message is stating that there is an error of that much flow across yo=
ur 1D/2D connection. To fix this, you either need to adjust the connection =
or increase the 1D/2D iterations to 20 if not done so already.

=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/Dam-Breach-Mod=
el-using-2D-in-HEC-RAS-5-0-3-1D-2D-Flow-Error-Message-tp3480p3485=
.html

=09
To unsubscribe from Dam Breach Model using 2D in HEC-RAS 5.0.3: 1D/2D Fl=
ow Error Message, click he=
re.
NAML

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[Lonnie A]

I don’t have any experience with this but I believe you might be able to purchase super computer time from Amazon?
https://aws.amazon.com/hpc/

[Kinagoto]

Thanks, Leonnie.

I will check it out.

[cameron]

For dam breach simulations, you can usually get away with larger grid cells as long as you include breaklines. By using larger grid cells, this should help with the run times.

3 to 5 hours is normal for 2D modeling depending on the size of models. Most models I run require 10-20 hours if not more as they require either a large area or lots of detail. Not sure what type of machine you have, but more cores is not always better. I seen models where a few cores is faster than over 20, but it all depends on the project.

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