& Construction
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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 approaching 2D modelling in ICM, there are a number of points to consider regarding resolution.
00:11
A higher resolution mesh more accurately represents the underlying topography,
00:16
but it also takes longer to run than a lower resolution mesh.
00:21
It is always a compromise between detail and speed of simulation and analysis.
00:33
Bigger models require better hardware, so your model limit may be the hardware that is available.
00:39
There are tools available to help manage the size of your models,
00:44
such as spatially varying the mesh size and employing terrain-sensitive meshing.
00:50
To demonstrate the impact of varying mesh detail on a model simulation time,
00:56
these three models are identical, except for the variations in mesh resolution.
01:02
The left-hand model uses "rural" sizes of 250m2 to 75m2.
01:09
The middle one uses "urban" sizes of 100m2 and 25m2, so it is likely to contain two to three times as many elements.
01:20
In this example, the run time for the model increased from 15 minutes to 40 minutes.
01:26
On the right side, the hybrid model has the urban resolution applied only to the area of interest,
01:33
with the rural resolution applied outside that area.
01:36
This allows for enhanced detail where required, but with only a modest impact on simulation speed.
01:44
The run time increase to 17 minutes is still less than half the time of the urban resolution model.
01:51
ICM offers another tool for managing the mesh size.
01:55
You can use terrain-sensitive meshing to increase the resolution of a 2D mesh in areas that have a large variation in height,
02:04
without increasing the number of elements in relatively flat areas of the same zone.
02:10
To begin, double-click 2D River Model to open the network on the GeoPlan.
02:16
A 2D mesh is already created for this model, so you can now apply the terrain-sensitive meshing.
02:23
From the Scenarios toolbar, click Create scenario.
02:27
In the Create new scenario popup, add a New Scenario Name of “Terrain meshing”, and then click OK.
02:36
Double-click an area of the 2D zone again, and from the Multiple Selection popup, select 2D Zone.
02:44
Click OK.
02:46
In the Properties window, enable Terrain-sensitive meshing.
02:51
An inline validation warning is generated as the mesh parameters have changed since meshing was last performed.
02:59
Currently, terrain-sensitive meshing parameters are specified for the entire 2D zone
03:05
and include the minimum element area specified for the 2D zone.
03:10
Terrain-sensitive meshing parameters cannot be set for individual mesh zones.
03:16
From the Model menu, select Meshing, and then select Mesh 2D Zones.
03:23
Drag the 2D Ground Model from the Database into the Mesh 2D zones dialog and drop it onto the Ground Model group box.
03:33
Click OK to mesh the 2D Zone.
03:36
In the Schedule Job(s) popup, click OK.
03:41
From the Window menu, select Job control window to display the status of the mesh job and some information on the generation.
03:50
The mesh generation process samples the ground model in each candidate triangle.
03:56
If the range of heights within the triangle exceeds the maximum height variation specified for the 2D Zone,
04:04
the triangle is split, increasing the resolution of the mesh in areas where terrain height varies rapidly.
04:11
Once the mesh has completed, it can be loaded into the model.
04:16
From the Job control window, click the Mesh ready status to open the Manage mesh results window.
04:23
Click Load mesh, and then Close.
04:27
The mesh is significantly different from the one that was generated without terrain-sensitive meshing,
04:33
noticeably along the steep sides but also along the bed of the channel.
04:39
Explore the changes in the mesh.
04:42
You can use the ground model for comparison.
04:45
When finished click Validate to make sure there are no errors in your Base and Terrain meshing networks.
04:52
Click Commit changes to database to save your changes.
04:56
Add a comment, such as “Terrain-sensitive meshing”, and then click OK.
Video transcript
00:03
When approaching 2D modelling in ICM, there are a number of points to consider regarding resolution.
00:11
A higher resolution mesh more accurately represents the underlying topography,
00:16
but it also takes longer to run than a lower resolution mesh.
00:21
It is always a compromise between detail and speed of simulation and analysis.
00:33
Bigger models require better hardware, so your model limit may be the hardware that is available.
00:39
There are tools available to help manage the size of your models,
00:44
such as spatially varying the mesh size and employing terrain-sensitive meshing.
00:50
To demonstrate the impact of varying mesh detail on a model simulation time,
00:56
these three models are identical, except for the variations in mesh resolution.
01:02
The left-hand model uses "rural" sizes of 250m2 to 75m2.
01:09
The middle one uses "urban" sizes of 100m2 and 25m2, so it is likely to contain two to three times as many elements.
01:20
In this example, the run time for the model increased from 15 minutes to 40 minutes.
01:26
On the right side, the hybrid model has the urban resolution applied only to the area of interest,
01:33
with the rural resolution applied outside that area.
01:36
This allows for enhanced detail where required, but with only a modest impact on simulation speed.
01:44
The run time increase to 17 minutes is still less than half the time of the urban resolution model.
01:51
ICM offers another tool for managing the mesh size.
01:55
You can use terrain-sensitive meshing to increase the resolution of a 2D mesh in areas that have a large variation in height,
02:04
without increasing the number of elements in relatively flat areas of the same zone.
02:10
To begin, double-click 2D River Model to open the network on the GeoPlan.
02:16
A 2D mesh is already created for this model, so you can now apply the terrain-sensitive meshing.
02:23
From the Scenarios toolbar, click Create scenario.
02:27
In the Create new scenario popup, add a New Scenario Name of “Terrain meshing”, and then click OK.
02:36
Double-click an area of the 2D zone again, and from the Multiple Selection popup, select 2D Zone.
02:44
Click OK.
02:46
In the Properties window, enable Terrain-sensitive meshing.
02:51
An inline validation warning is generated as the mesh parameters have changed since meshing was last performed.
02:59
Currently, terrain-sensitive meshing parameters are specified for the entire 2D zone
03:05
and include the minimum element area specified for the 2D zone.
03:10
Terrain-sensitive meshing parameters cannot be set for individual mesh zones.
03:16
From the Model menu, select Meshing, and then select Mesh 2D Zones.
03:23
Drag the 2D Ground Model from the Database into the Mesh 2D zones dialog and drop it onto the Ground Model group box.
03:33
Click OK to mesh the 2D Zone.
03:36
In the Schedule Job(s) popup, click OK.
03:41
From the Window menu, select Job control window to display the status of the mesh job and some information on the generation.
03:50
The mesh generation process samples the ground model in each candidate triangle.
03:56
If the range of heights within the triangle exceeds the maximum height variation specified for the 2D Zone,
04:04
the triangle is split, increasing the resolution of the mesh in areas where terrain height varies rapidly.
04:11
Once the mesh has completed, it can be loaded into the model.
04:16
From the Job control window, click the Mesh ready status to open the Manage mesh results window.
04:23
Click Load mesh, and then Close.
04:27
The mesh is significantly different from the one that was generated without terrain-sensitive meshing,
04:33
noticeably along the steep sides but also along the bed of the channel.
04:39
Explore the changes in the mesh.
04:42
You can use the ground model for comparison.
04:45
When finished click Validate to make sure there are no errors in your Base and Terrain meshing networks.
04:52
Click Commit changes to database to save your changes.
04:56
Add a comment, such as “Terrain-sensitive meshing”, and then click OK.
Points to consider regarding resolution of 2D mesh:
To demonstrate the impact of varying mesh detail on a model simulation time, these three models are identical, except for variations in mesh resolution:
Rural model: Uses "rural" sizes of 250m2 to 75m2.
Urban model:
Hybrid model:
For managing the mesh size, Terrain-sensitive meshing can be used to increase the resolution of a 2D mesh in areas that have a large variation in height, without increasing the number of elements in relatively flat areas of the same zone.
Note: A 2D mesh has already been created for this model.
To apply the terrain-sensitive meshing:
An inline validation warning is generated, as mesh parameters have changed since meshing was last performed.
NOTE: Terrain-sensitive meshing parameters are specified for the entire 2D zone and include the minimum element area specified for the 2D zone. These parameters cannot be set for individual mesh zones.
IMPORTANT: The mesh generation process samples the ground model in each candidate triangle. If the range of heights within the triangle exceeds the maximum height variation specified for the 2D Zone, then the triangle is split, increasing the resolution of the mesh in areas where terrain height varies rapidly.
Once the mesh has completed, load it into the model:
NOTE: The mesh is significantly different from the one generated without terrain-sensitive meshing, most noticeably along the steep sides, but also along the bed of the channel.
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