Steady vs Unsteady flow results

[Arthur Barboza]

Hi everybody,

I am having a little trouble while running steady and unsteady flow simulation.

In the steady state, my results match with observed WS elevations all along the reach. But, if I run an unsteady simulation (constant flow and boundary condition exactly the same as in steady state), two “waterfalls” appears in the middle of the reach, giving me WS elevations way higher than observed data.

Does somebody have a clue about what might be happening? I know HEC-RAS solve steady/unsteady simulation with different routines and equations, but I wouldn’t expect such a big difference in Froude number and others hydraulic properties that affects the WS elevation.

Thanks,

Arthur

[cameron]

Did you adjust the Htab parameters? Are there any structures in the model? Do the hydrographs at any of the structures look funny? Have you tested different timesteps? Do you get any errors when running in unsteady?

[Arthur Barboza]

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From: “Arthur Barboza”
To: “‘cameron [via HEC-RAS Help]'”
References: <[email protected]> <[email protected]>
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Subject: RES: Steady vs Unsteady flow results
Date: Wed, 14 Jun 2017 10:03:29 -0300
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Thanks a lot Cameron! I solved it by adjusting the HTab Parameters, they
were default.

=20

Thanks,

=20

Arthur Prado Barboza

Engenheiro Ambiental | [email protected] =

Av. Rio Branco 20, 13=BA andar Centro
20090-000 Rio de Janeiro RJ Brasil
+55 21 2576-6090 | <http://www.hicon.com.br/> http://www.hicon.com.br

Antes de imprimir, pense em sua responsabilidade

=20

De: cameron [via HEC-RAS Help] =
[mailto:[email protected]]=20
Enviada em: Wednesday, June 14, 2017 12:36 AM
Para: Arthur Barboza
Assunto: Re: Steady vs Unsteady flow results

=20

Did you adjust the Htab parameters? Are there any structures in the =
model?
Do the hydrographs at any of the structures look funny? Have you tested
different timesteps? Do you get any errors when running in unsteady?=20

_____ =20

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Thanks a lot Cameron! =
I solved it by adjusting the HTab Parameters, they were =
default.

 

Thanks,

 

=
Arthur Prado Barboza

=
Engenheiro Ambiental |=
=
[email protected]

=
Av. Rio Branco 20, 13=BA =
andar   Centro
20090-000   Rio de =
Janeiro   RJ   Brasil
+55 21 2576-6090 =
| http://www.hicon.com.br

&nb=
sp;=
An=
tes de imprimir, pense em sua responsabilidade

 

De: cameron [via HEC-RAS Help] =
[mailto:[email protected]]
Enviada em: =
Wednesday, June 14, 2017 12:36 AM
Para: Arthur Barboza =
<[email protected]>
Assunto: Re: Steady vs Unsteady =
flow results

 

Did you adjust the Htab =
parameters?  Are there any structures in the model? Do the =
hydrographs at any of the structures look funny?  Have you tested =
different timesteps?  Do you get any errors when running in =
unsteady?

---

I=
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