Anuga-user Digest, Vol 68, Issue 3
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May 13, 2014, 8:19:21 AM5/13/14
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Today's Topics:
1. Re: Inflow boundary for subcritical flow [SEC=UNCLASSIFIED]
(Gareth...@ga.gov.au)
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Message: 1
Date: Mon, 12 May 2014 23:33:31 +0000
From: Gareth...@ga.gov.au
Subject: Re: [Anuga-user] Inflow boundary for subcritical flow
[SEC=UNCLASSIFIED]
To: anuga...@lists.sourceforge.net, slog...@gmail.com
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Hi Mathieu,
I would suggest using an 'inflow' boundary where you set the discharge [see e.g. the 'trapezoidal channel' flow test in anuga_core/source/anuga_validation_tests/analytical/].
You might want to append a stretch of uniform channel to your domain near the boundary, so that the flow has time to adjust to 'normal flow'. In my experience you probably won't get normal flow exactly at the boundary, because of the way the inflow boundary is code. But if you give the model a bit of distance to adjust, you should achieve normal flow a bit downstream from the boundary.
Cheers,
G.
-----Original Message-----
From: anuga-use...@lists.sourceforge.net [mailto:anuga-use...@lists.sourceforge.net]
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Today's Topics:
1. Inflow boundary for subcritical flow (Mathieu Lap?tre)
2. Inflow boundary for subcritical flow (Mathieu Lapotre)
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Message: 1
Date: Sun, 11 May 2014 23:19:44 +0200
From: Mathieu Lap?tre <lapotre...@hotmail.com>
Subject: [Anuga-user] Inflow boundary for subcritical flow
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Hi,I am modeling a subcritical flow towards a waterfall. At my upstream boundary, I want to have normal flow conditions. Until now, I used a Dirichlet boundary condition with normal stage and discharge at a distance close to a backwater length upstream, but this is affecting the flow depth at the overfall because I am imposing discharge and depth at the inflow boundary when it should really be controlled by the drawdown effect of the waterfall. Is there another boundary condition that would be more appropriate for me to use? (I played around with Transmissive_n_momentum_zero_t_momentum_set_stage_boundary, and tried to use it with a constant stage at the inflow boundary, nut my domain dries out in a few time steps)Many thanks in advance for your help,- Mathieu Lapotre
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Date: Sun, 11 May 2014 14:10:09 -0700
From: Mathieu Lapotre <slog...@gmail.com>
Subject: [Anuga-user] Inflow boundary for subcritical flow
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Hi,
I am modeling a subcritical flow towards a waterfall. At my upstream boundary, I want to have normal flow conditions. Until now, I used a Dirichlet boundary condition with normal stage and discharge at a distance close to a backwater length upstream, but this is affecting the flow depth at the overfall because I am imposing discharge and depth at the inflow boundary when it should really be controlled by the drawdown effect of the waterfall.
Is there another boundary condition that would be more appropriate for me to use? (I played around with Transmissive_n_momentum_zero_t_momentum_set_stage_boundary, and tried to use it with a constant stage at the inflow boundary, nut my domain dries out in a few time steps)
Many thanks in advance for your help,
- Mathieu Lapotre
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Today's Topics:
1. Re: Inflow boundary for subcritical flow [SEC=UNCLASSIFIED]
(Gareth...@ga.gov.au)
----------------------------------------------------------------------
Message: 1
Date: Mon, 12 May 2014 23:33:31 +0000
From: Gareth...@ga.gov.au
Subject: Re: [Anuga-user] Inflow boundary for subcritical flow
[SEC=UNCLASSIFIED]
To: anuga...@lists.sourceforge.net, slog...@gmail.com
Message-ID: <c7b0f61c53c74059...@WIN-EXCH02.agso.gov.au>
Content-Type: text/plain; charset=us-ascii
Hi Mathieu,
I would suggest using an 'inflow' boundary where you set the discharge [see e.g. the 'trapezoidal channel' flow test in anuga_core/source/anuga_validation_tests/analytical/].
You might want to append a stretch of uniform channel to your domain near the boundary, so that the flow has time to adjust to 'normal flow'. In my experience you probably won't get normal flow exactly at the boundary, because of the way the inflow boundary is code. But if you give the model a bit of distance to adjust, you should achieve normal flow a bit downstream from the boundary.
Cheers,
G.
-----Original Message-----
From: anuga-use...@lists.sourceforge.net [mailto:anuga-use...@lists.sourceforge.net]
Sent: Monday, 12 May 2014 10:04 PM
To: anuga...@lists.sourceforge.net
Subject: [DKIM] Anuga-user Digest, Vol 68, Issue 2
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Today's Topics:
1. Inflow boundary for subcritical flow (Mathieu Lap?tre)
2. Inflow boundary for subcritical flow (Mathieu Lapotre)
----------------------------------------------------------------------
Message: 1
Date: Sun, 11 May 2014 23:19:44 +0200
From: Mathieu Lap?tre <lapotre...@hotmail.com>
Subject: [Anuga-user] Inflow boundary for subcritical flow
To: "anuga...@lists.sourceforge.net"
<anuga...@lists.sourceforge.net>
Message-ID: <DUB123-W5707DB2BA...@phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Hi,I am modeling a subcritical flow towards a waterfall. At my upstream boundary, I want to have normal flow conditions. Until now, I used a Dirichlet boundary condition with normal stage and discharge at a distance close to a backwater length upstream, but this is affecting the flow depth at the overfall because I am imposing discharge and depth at the inflow boundary when it should really be controlled by the drawdown effect of the waterfall. Is there another boundary condition that would be more appropriate for me to use? (I played around with Transmissive_n_momentum_zero_t_momentum_set_stage_boundary, and tried to use it with a constant stage at the inflow boundary, nut my domain dries out in a few time steps)Many thanks in advance for your help,- Mathieu Lapotre
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Date: Sun, 11 May 2014 14:10:09 -0700
From: Mathieu Lapotre <slog...@gmail.com>
Subject: [Anuga-user] Inflow boundary for subcritical flow
To: anuga...@lists.sourceforge.net
Message-ID:
<CAGwHxdYwWOU+wh=B31GQ0Z+ivftUEC9V...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi,
I am modeling a subcritical flow towards a waterfall. At my upstream boundary, I want to have normal flow conditions. Until now, I used a Dirichlet boundary condition with normal stage and discharge at a distance close to a backwater length upstream, but this is affecting the flow depth at the overfall because I am imposing discharge and depth at the inflow boundary when it should really be controlled by the drawdown effect of the waterfall.
Is there another boundary condition that would be more appropriate for me to use? (I played around with Transmissive_n_momentum_zero_t_momentum_set_stage_boundary, and tried to use it with a constant stage at the inflow boundary, nut my domain dries out in a few time steps)
Many thanks in advance for your help,
- Mathieu Lapotre
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http://p.sf.net/sfu/SauceLabs
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Get unparalleled scalability from the best Selenium testing platform available
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