1D Mesh Collector dialog box (Thermal/Flow/SST/ESC)

Element Topology
The options described on this page are for:Element Family = 1D****Collector Type = Beam or Duct
Collector Type	Specifies the collector type for the selected family.BeamModels long, thin, narrow structures, such as beams, struts, guides, and channels. You can model conduction along the length and radiation radially at the free ends. You can thermally couple the beam elements to other parts of the model in various ways using thermal couplings.DuctModels long, thin, narrow fluid-carrying structures in duct networks.
Type
Type	Specifies the type of 1D beam or duct mesh collector to create.You can select the following types when Collector Type is set to Beam:BeamModels long, thin, narrow structures, such as beams, struts, guides, and channels.Beam AxisymmetricModels circular shells using axisymmetric curves in a thermal model that has both axisymmetric elements and non-axisymmetric elements. The axisymmetric elements cannot share nodes with the non-axisymmetric elements.You can select the following types when Collector Type is set to Duct:DuctModels long, thin, narrow fluid-carrying structures, such as ducts, channels, and pipes.Duct with Thick WallModels long, thin, narrow fluid-carrying structures, such as ducts, channels, and pipes. It also allows you to model convection and thermal effects on the duct material with the same mesh.When a mesh has Duct with Thick Wall type properties, the software automatically creates convective couplings between the fluid and the wall. Fluid in the duct and the wall of the duct exchange heat based on standard correlations for smooth walls.Duct with Mass FlowModels long, thin, narrow fluid-carrying structures, such as ducts, channels, and pipes with fixed mass flow. In duct with mass flow fluid networks, the pressure solution, which is calculated for normal duct elements, is disabled.Duct AxisymmetricModels annular ducts using axisymmetric curves in a thermal model that has both axisymmetric elements and non-axisymmetric elements. The axisymmetric elements cannot share nodes with the non-axisymmetric elements.Duct with Mass Flow AxisymmetricModels circular ducts with fixed mass flow using axisymmetric curves in a thermal model that has both axisymmetric elements and non-axisymmetric elements. The axisymmetric elements cannot share nodes with the non-axisymmetric elements.
Material
Material	Appears when Collector Type is set to Beam.Assigns an isotropic material with thermal properties to the mesh collector. You cannot use a mesh that belongs to a 1D beam mesh collector to model a fluid.Select a material from the list of materials assigned to the model, or click Choose material to define a new material.
Fluid Material	Appears when Collector Type is set to Duct.Assigns a fluid material, which defines the material properties of the liquid or gas in the duct.Select a material from the list of materials assigned to the model, or click Choose material to define a new material.
Thick Wall Material	Appears when Collector Type is set to Duct and Type is set to Duct with Thick Wall.Assigns an isotropic material with thermal properties to define the material properties of the duct wall.Select a material from the list of materials assigned to the model, or click Choose material to define a new material.
Physical Property
Beam Property	Appears when Type is set to Beam.Specifies a Beam physical property table, which adds non-structural mass.
Shell Property	Appears when Type is set to Beam Axisymmetric.Specifies a Thin Shell physical property table, which defines the thickness for the axisymmetric shell and, if necessary, adds non-structural mass.
Duct Property	Appears when Type is set to Duct Axisymmetric.Specifies a Duct physical property table, which defines the thickness for the axisymmetric duct.
Section
Appears when Type is set to Beam, Duct, or Duct with Thick Wall.
Section Type	Specifies the type of cross section to assign to curves.ConstantSpecifies that the beam section is identical at all points along the element’s length.TaperedSpecifies that the beam section tapers. The taper is defined as a linear transition from the section defined as the Fore Section to the section defined as the Aft Section.Tip: To view positive and negative directions of the 1D mesh, right-click the 1D mesh node in the Simulation Navigator and choose Display Section.
Fore Section****Aft Section	Specify the appropriate beam cross sections. Choose a previously defined section from the list or click Show Section Manager to define a new section.Aft Section appears when Section Type is set to Tapered.
Apply taper to	Appears when Section Type is set to Tapered.Specifies how the taper is applied.Each Element(1) Applies the taper to each element.End Nodes of Chain(2) Applies the taper between the end nodes of a chain.
Thermo-Optical Properties
Appears when Type is set to Beam, Beam Axisymmetric, or Duct with Thick Wall.
Radiation	Appears when Type is not set to Beam Axisymmetric.Activates radiation calculations for the elements in the mesh collector.
Radiation	Appears when Type is set to Beam Axisymmetric.Specifies whether and where radiation calculations for the elements in the mesh collector occur.You can activate radiation calculation for the following faces of the shell: top face, bottom face, or both, top and bottom faces.
Thermo-Optical Properties / Top / Bottom	Thermo-Optical Properties available when Radiation is selected. Top available when the Radiation is set to Top or Top and Bottom. Bottom available when the Radiation is set to Bottom or Top and Bottom.Specifies the thermo-optical properties for modeling radiation.Black BodyDefines an emissivity of 1.Thermo-Optical Properties Defines a constant or temperature-varying emissivity.Thermo-Optical Properties-AdvancedDefines the infrared and solar thermo-optical properties for modeling gray radiation or wavelength-dependent thermo-optical properties for modeling non-gray radiation.Thermo-Optical Properties - StateDefines up to five thermo-optical property states. Each state references one Thermo-Optical Properties or Thermo-Optical Properties - Advanced modeling object. Use Thermo-Optical Properties - State to model optical property degradation.This modeling object is only available in Simcenter 3D Thermal/Flow or Space Systems Thermal solver environments.Select Black Body or a modeling object from the list, or click Open Manager to define a new modeling object.Click Edit to modify the specified modeling object.Click More Options to search and filter modeling objects. The following options are available.FindLets you search for an object by entering the full name of the object. If the object is found, it is selected automatically.Example: To find a region named ABC_region, type ABC_region in the search box and press Enter or click Find .Filter by NameLets you filter the list by the names of the objects. This filter supports wildcards. The default wildcard is the asterisk (), and it displays all entries in the list.Example: To filter the list to display every object with a name starting with the letter “a, enter a as the filter string.
Axisymmetric Properties
Appears when Type is set to Beam Axisymmetric, Duct Axisymmetric, or Duct with Mass Flow Axisymmetric.
Revolve Axis	Lets you specify a vector and a point that define the axis of revolution for the axisymmetric elements. You specify the X-axis, Y-axis, or Z-axis of the absolute coordinate system only.
Number of Axisymmetric Segments	Sets the value for the number of axisymmetric segments that the thermal solver uses to complete one full revolution.

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Mesh collectors

Defining materials for Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

Specifying cross sections for 1D elements (Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal)

Thermo-optical properties

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Summary of available Mesh Collector properties for Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

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1D Mesh Collector dialog box (Thermal/Flow/SST/ESC), Simcenter 3D 2021.1 Series

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