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Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
& Manufacturing
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Professional CAD/CAM tools built on Inventor and AutoCAD
Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
Professional CAD/CAM tools built on Inventor and AutoCAD
Transcript
00:03
When combining 1D and 2D models, the exchange of flow between the 1D and 2D systems can only take place at specific objects.
00:14
To get the exchange of flow to be an accurate representation,
00:18
you need to select an approach that is appropriate for the mechanism and scale of the model.
00:24
Point coupling takes place between a single element and a node object.
00:29
Typical uses are in locations where manholes, gullies, or outfalls exist.
00:35
The link between 2D elements and 1D nodes is made up of point connections.
00:50
In an InfoWorks ICM network, a node is defined as a 2D node if it is of type:
00:57
Manhole (with flood type set to 2D,
01:01
Gully 2D,
01:03
or Inlet 2D),
01:05
Outfall 2D, or Connect 2D.
01:10
By default, the interaction between 1D and 2D nodes is based on depth values.
01:17
A manhole node, with the flood type set to Gully 2D allows you to define a head-discharge relationship.
01:25
This allows the flexibility to define the flow characteristics that you want to represent for any structure, inlet, or outlet.
01:34
For example, this can be used to minimize flow into the sewer system from the surface.
01:41
ICM also allows you to use a number of additional equations and parameters to represent inlets in the network.
01:50
When using the Inlet 2D flood type, you have the choice to define a head-discharge curve.
01:57
Additionally, you can specify a simplified equation using A and B parameters.
02:04
Define flow efficiency parameters, or, specify the inlet parameters based on the FHWA equations.
02:13
There are three important basic questions to ask when converting 1D nodes to 2D nodes.
02:21
Is the 1D-2D flow exchange appropriate?
02:25
This should consider the linkage type selected and the system to be used.
02:30
A 2D flood type may be appropriate for the storm system where the inlets are not modelled explicitly,
02:37
but most likely, it is not appropriate for a foul or sanitary network
02:42
as it would let too much unrestricted flow into the network.
02:47
Are the node locations appropriate?
02:49
A common issue with nodes can be the processing of the ground model.
02:54
The node location may be correct,
02:56
but smoothing or cleaning of the ground model may mean that the true height of the ground is not represented at that location.
03:04
There may be a need to adjust the node location slightly, so that it sits within an element that better reflects the true ground level.
03:13
Are the 1D-2D ground levels sufficiently aligned?
03:18
Ideally, these would be equivalent.
03:20
At best, they should have reasonable alignment within a foot, but you may wish for higher accuracy in your areas of interest.
03:29
For 2D nodes, you should check the results for instances of flow limiting, as this may indicate that the representation is not appropriate.
03:39
When modelling 2D inlets, flow capping is applied to limit exchange between the 2D and 1D network
03:47
in situations where inflow at the node would exceed volume contained in the 2D element at any given timestep.
03:55
This may occur if the 2D element that the inlet node is located within is too small.
Video transcript
00:03
When combining 1D and 2D models, the exchange of flow between the 1D and 2D systems can only take place at specific objects.
00:14
To get the exchange of flow to be an accurate representation,
00:18
you need to select an approach that is appropriate for the mechanism and scale of the model.
00:24
Point coupling takes place between a single element and a node object.
00:29
Typical uses are in locations where manholes, gullies, or outfalls exist.
00:35
The link between 2D elements and 1D nodes is made up of point connections.
00:50
In an InfoWorks ICM network, a node is defined as a 2D node if it is of type:
00:57
Manhole (with flood type set to 2D,
01:01
Gully 2D,
01:03
or Inlet 2D),
01:05
Outfall 2D, or Connect 2D.
01:10
By default, the interaction between 1D and 2D nodes is based on depth values.
01:17
A manhole node, with the flood type set to Gully 2D allows you to define a head-discharge relationship.
01:25
This allows the flexibility to define the flow characteristics that you want to represent for any structure, inlet, or outlet.
01:34
For example, this can be used to minimize flow into the sewer system from the surface.
01:41
ICM also allows you to use a number of additional equations and parameters to represent inlets in the network.
01:50
When using the Inlet 2D flood type, you have the choice to define a head-discharge curve.
01:57
Additionally, you can specify a simplified equation using A and B parameters.
02:04
Define flow efficiency parameters, or, specify the inlet parameters based on the FHWA equations.
02:13
There are three important basic questions to ask when converting 1D nodes to 2D nodes.
02:21
Is the 1D-2D flow exchange appropriate?
02:25
This should consider the linkage type selected and the system to be used.
02:30
A 2D flood type may be appropriate for the storm system where the inlets are not modelled explicitly,
02:37
but most likely, it is not appropriate for a foul or sanitary network
02:42
as it would let too much unrestricted flow into the network.
02:47
Are the node locations appropriate?
02:49
A common issue with nodes can be the processing of the ground model.
02:54
The node location may be correct,
02:56
but smoothing or cleaning of the ground model may mean that the true height of the ground is not represented at that location.
03:04
There may be a need to adjust the node location slightly, so that it sits within an element that better reflects the true ground level.
03:13
Are the 1D-2D ground levels sufficiently aligned?
03:18
Ideally, these would be equivalent.
03:20
At best, they should have reasonable alignment within a foot, but you may wish for higher accuracy in your areas of interest.
03:29
For 2D nodes, you should check the results for instances of flow limiting, as this may indicate that the representation is not appropriate.
03:39
When modelling 2D inlets, flow capping is applied to limit exchange between the 2D and 1D network
03:47
in situations where inflow at the node would exceed volume contained in the 2D element at any given timestep.
03:55
This may occur if the 2D element that the inlet node is located within is too small.
When combining 1D and 2D river models, exchange of flow between 1D and 2D systems can only take place at specific objects.
To accurately represent exchange of flow, select an approach appropriate for mechanism and scale of model.
Point coupling takes place between single element and node object.
Typically used in locations with manholes, gullies, or outfalls.
Link between 2D elements and 1D nodes is made up of point connections.
2D nodes are used to model exchange of flood water between collection system and 2D meshed area.
Node types defined as 2D nodes:
By default, interaction between 1D and 2D nodes is based on depth values.
Manhole node with flood type set to Gully 2D allows you to define head-discharge relationship.
Allows flexibility to define flow characteristics you want to represent for any structure, inlet, or outlet.
For example, can be used to minimize flow into sewer system from surface.
Can use additional equations and parameters to represent inlets in an ICM network.
Using Inlet 2D flood type allows you to define a head-discharge curve.
Additionally, can specify simplified equation using A and B parameters.
Define flow efficiency parameters, or specify inlet parameters based on FHWA equations.
Three important questions to ask when converting 1D nodes to 2D nodes:
Is the 1D-2D flow exchange appropriate?
Are the node locations appropriate?
Are the 1D-2D ground levels sufficiently aligned?
For 2D nodes, check results for instances of flow limiting—may indicate that representation is not appropriate.
When modelling 2D inlets, flow capping can limit exchange between 2D and 1D network, where inflow at node would exceed volume contained in 2D element at any given timestep.
May occur if inlet node is located in a 2D element that is too small.
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