14. Predefined labels and links

Links and labels are general tools to describe an EM simulation. Besides, some concepts are often used accross all numerical methods like the wire radius concept, that’s why Amelet HDF predefines some labels and some links.

14.1. Predefined labels

Amelet HDF predefined some labels, they are contained in /label/predefinedLabels dataset.

Example :

data.h5
`-- label/
    `-- predefinedLabels

where data.h5:/label/predefinedLabels is :

$firstLabel

$secondLabel

The predefined labels are described in the next sections.

14.1.1. Wire radius

wireRadius label is used to set the radius of a wire. See Wire radius Link for its usage.

14.2. Predefined Links

Labels can be involed in links creation, so this fact implies the definition of predefined links.

In addition, other links are predefined that does’nt make participate predefined labels.

14.2.1. Predefined type attribute

Link groups can have a type attribute. This attribute is an HDF5 string attribute. This attribute allows to give common characteristics to link instances children of groups.

For example, a link group type attribute can be dataOnMesh, that is to say all children links associate a /physicalModel or an electromagneticSource to a mesh entity.

Amelet HDF defined several link group type.

The type attribute is owned by the link group and not by the link. The function of the type is to facilitate the research and the storage of simular nature links. In fact, the type attribute gives the same information than the reading of the subject and the object of a link.

14.2.2. Wire radius Link

wireRadius is predefied label used to set the radius of a wire. A link built from the wireRadius has a mandatory attribute :

• radius : radius is a real HDF5 attribute, it is a length in meter. radius gives the radius of the wire in meter.

Example :

data.h5
|-- label/
|   `-- predefinedLabels
|-- mesh/
|   `-- $gmesh1
|       `-- $antenna1
|           `-- group
|               `-- $wire1
`-- link
    `-- $link_group
        `-- $radiusOfWire1[@subject=/label/predefinedLabels
                           @subject_id=0
                           @object=/mesh/$gmesh1/$antenna1/group/$wire1
                           @radius=1e-3]

14.2.3. Data on mesh link

If type equals dataOnMesh, all link instances associate a data to a mesh entity. It is a specialized form of links.

Data can be :

• A /predefinedLabel label
• A /physicalModel instance
• An /electromagneticSource instance

data.h5
|-- mesh/
|   `-- $gmesh1
|       `-- $plane
|           |-- nodes
|           |-- elementTypes
|           |-- elementNodes
|           |-- group
|           |   `-- $wing
|           `-- selectorOnMesh
|               |-- elements
|               `-- nodes
|-- electromagneticSource/
|   `-- generator/
|       |-- $v1
|       `-- $i1
`-- link/
    `-- $link_group[@type=dataOnMesh
        |           @rootObject=/mesh/$gmesh1/$plane/selectorOnMesh]/
        |-- $link_instance1[@subject=/electromagneticSource/generator/$v1
        |                   @object=$generator_v1]
        `-- $link_instance2[@subject=/electromagneticSource/generator/$i1
                            @object=$generator_i1]

Where data.h5:/mesh/$gmesh1/$plane/selectorOnMesh/$generator_v1 is

index

23

Where data.h5:/mesh/$gmesh1/$plane/selectorOnMesh/generator_i1 is

index

26

In this example, the link group data.h5:/link/$link_group is a specialized link group for dataOnMesh links.

14.2.4. Data in localization system link

dataInLocalizationSystem type allows to gather links associating data to a localization system in order to locate and to orient models in the space (an antenna for instance).

data.h5
|-- electromagneticSource/
|   `-- antenna/
|       `-- $antenna1
|-- localizationSystem
|   `++ $locasys[@dimension=3]
`-- link
    `-- $link_group[@type=dataInLocalizationSystem]
        `-- $v1-location[@subject=/electromagneticSource/antenna/$antenna1]
                         @object=/localizationSystem/$locasys]

In this example, data.h5:/electromagneticSource/antenna/$antenna1 is located and oriented thanks to data.h5:/localizationSystem/$locasys.

Without the type attribute, subject and object are enough to understand the link’s nature.

14.2.5. Specific role link

If type equals specificRole, all link instances associate a label

to an object. It is a specialized form of links.

Example :

data.h5
|-- label/
|   `-- predefinedLabels
|-- mesh/
|   `-- $gmesh1
|       `-- $antenna1
|           `-- group
|               `-- $wire1
`-- link
    `-- $link_group[@type=specificRole]
        `-- $transmitter[@subject=/label
                         @subject_label=transmitter
                         @object=/mesh/$gmesh1/$antenna1/group/$wire1]

14.2.6. TransmissionLineOnMesh Link

A “transmissionLineOnMesh” link associates a transmissionLine to a mesh.

It has one optional attribute :

• modelsOnSectionLink is an HDF5 string attribute and contains the name of the link group defining the section of the transmission line

and an optional child dataset named elementsOnSection :

• elementsOnSection is an HDF5 (n x 2) string dataset which

  contains a list of (transmission line element, named mesh entity) string couple defining the association between transmission line elements and mesh entities.

data.h5
|-- mesh/
|   `-- $tl11
|-- transmissionLine/
|   `-- $tl1
`-- link/
    `-- $transmissionline_on_mesh[@type=transmissionLineOnMesh]/
        `-- $link1[@subject=/transmissionLine/$tl1
            |      @object=/mesh/$gmesh1/$tl1
            |      @modelsOnSectionLink=/link/$models_on_section]
            `-- elementsOnSection

with elementsOnSection :

$tl_elem1	$mesh_elem1
$tl_elem2	$mesh_elem2
$tl_elem3	$mesh_elem3

$tl_* and $mesh_* are named element of /transmissionLine/$tl1 and /mesh/$gmesh1/$tl1.

14.2.7. NetworkOnMesh Link

In this example, a new link /link/$network_on_mesh/$tub1 is defined, it links a network to a mesh, for doing this association the link contains a child : an HDF5 string dataset named data.

The data dataset has two columns :

• The first column contains tubes’ id from the network’s tubes dataset
• The second column contains named elements from the mesh.

The link has an optional attribute name harness :

• harness is an HDF5 string attribute that can be equal to :

• real, in this case the mesh defined in the link is a real harness.
• fictitious``in this case the mesh defined in the link is a ``fictitious harness. Nodes, named elements are not properly located in space, but tube’s length is correct.

data.h5
|-- mesh/
|   `-- $gmesh1
|       `-- $net1
|-- network/
|   `-- $net1
`-- link/
    `-- $network_on_mesh[@type=networkOnMesh]
        `-- $net1[@subject=/network/$net1
            |     @object=/mesh/$gmesh1/$net1
            |     @harness=fictitious]
            `-- data

$net_tube1	$mesh_tube1
$net_tube2	$mesh_tube2
$net_tube3	$mesh_tube3

$net_* and $mesh_* are named element of /network/$net1 and /mesh/$gmesh1/$net1.

14.2.8. Model on a network link

The problem is to put a model (a generator for example) on a wire of a network tube.

The way to accomplish this is to add a link between a generator and a 1D mesh entity, a idWire option allows to select the wire.

data.h5
|-- mesh
|   `-- $gmesh1
|       `-- $net1
|-- electromagneticSource/
|   `-- generator
|       `-- $gene1
|-- transmissionLine/
|   `-- $tl1
|-- link
|   |-- $data_on_mesh[@type=dataOnMesh]
|   |   `-- $gene1[@subject=/electromagneticSource/generator/$gene1
|   |              @object=/mesh/$gmesh1/$net1/selectorOnMesh/$gene1
|   |              @idWire = 2]
|   `-- $network_on_mesh[@type=networkOnMesh]
|       `-- $net1[@subject=/network/$net1
|           |     @object=/mesh/$gmesh1/$tubes]
|           `-- data
`-- network/
    `-- $net1

with data.h5:/mesh/$gmesh1/$net1/selectorOnMesh/$gene1 :

index	v1	v2	v3
1	0.5	-1	-1