Thermal Stream dialog box

Use this dialog box to set options for the Thermal Stream load for the Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Multiphysics solvers.

Type
Type	Specifies the Thermal Stream load type based on whether you want the thermal stream to be in contact with the solid element on one side or both sides. One-Sided Stream on EdgesDefines thermal streams on polygon edges, 1D beam elements, regular shell element edges, and axisymmetric shell element edges. The thermal stream is in contact with solid elements only on one side. If you want the thermal stream to be in contact with solid elements on both sides, select Two-Sided Stream on Edges . One-Sided Stream on FacesDefines thermal streams on polygon faces, 2D elements, and 3D element faces that flow in the direction of the specified vector. The thermal stream is in contact with solid elements only on one side. If you want the thermal stream to be in contact with solid elements on both sides, select Two-Sided Stream on Faces . **One-Sided Stream on Faces (Cylindrical Components)**Defines thermal streams on polygon faces, 2D elements, and 3D element faces that flow cylindrically over the surface. The thermal stream is in contact with solid elements only on one side. If you want the thermal stream to be in contact with solid elements on both sides, select Two-Sided Stream on Faces (Cylindrical Components) . Two-Sided Stream on Edges and FacesDefines thermal streams in contact with solid elements that are, on one side, on polygon edges, 1D elements, or edges of 2D elements, and, on the other side, on polygon faces, 2D elements, and 3D element faces that flow in the direction of the specified vector.
Name
Name	Sets the name for the thermal stream load. The name appears in the Simulation Navigator and the graphics window.
Boundary Condition ID	Sets a numerical ID, which you can use as an argument in some thermal-flow functions in the CAE expression system. For more information, see Boundary condition ID in expressions.
Description	Lets you enter a description of the thermal stream load.
Destination Folder
Load Container	Specifies the folder in the Simulation Navigator in which the boundary condition will be stored. The list includes the root container and existing folders that you created using the New Folder command. Examples of a root container include Load Container, Constraint Container, and Simulation Object Container.
Folder Manager	Displays a hierarchical listing of existing folders. To create a new folder, right-click any level of the hierarchy and choose New Folder.
Path Selection/Path Selection — Side A/Path Selection — Side B
The Path Selection group appears when Type is set to One-Sided Stream on Edges. Path Selection — Side A and Path Selection — Side B groups appear when Type is set to Two-Sided Stream on Edges.Path Selection — Side A group also appears when Type is set to Two-Sided Stream on Edges and Faces.
Selection Type	Specifies whether you select polygon edges or element edges to define the thermal stream.
Select Object	Lets you select polygon edges or element edges to define the fluid-solid interface of the thermal stream. The direction of the path is defined by the order of the edges you select. You do not need to select all the edges of a stream. It is sufficient to select only the first and last edges. As you are selecting the path, the edges are highlighted in red. After you complete your selection, circles are displayed on the path that denote the locations you picked at the start and end of your selection.To reverse the direction of the path, click Reverse Path or right-click the arrow in the graphics window and choose Reverse Direction.
Path Limits	Appears when Selection Type is set to Polygon Edge.Lets you define start (1) and end (2) points anywhere on the selected polygon edges. The software finds the edge element nodes closest to the specified points and passes it to the solvers. Define Start PointLet you specify the starting point for the thermal stream on edge using Specify Start Point . Define End PointLet you specify the ending point for the thermal stream on edge using Specify End Point .For more information on point selection and creation, see Point dialog box.
Region/Region — Side A/Region — Side B
The Region group appears when Type is set to One-Sided Stream on Faces or One-Sided Stream on Faces (Cylindrical Components).Region — Side A and Region — Side B groups appear when Type is set to Two-Sided Stream on Faces or Two-Sided Stream on Faces (Cylindrical Components).Region — Side B group also appears when Type is set to Two-Sided Stream on Edges and Faces.
Group Reference	Applies the boundary condition to the selected group. For more information, see Group Reference options.
Select Object	Lets you select the faces or elements to define the fluid-solid interface of the thermal stream. You can select faces of multiple bodies.Excluded lets you remove individual entities from within your selected object. The software does not apply the boundary condition to the excluded elements.Note: The Element Selection Filtering options are available when the Type Filter list on the Top Border bar is set to Elements.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
Direction/Direction — Side B
The Direction group appears when Type is set to One-Sided Stream on Faces, Two-Sided Stream on Faces, One-Sided Stream on Faces (Cylindrical Components), or Two-Sided Stream on Faces (Cylindrical Components).Direction — Side B group appears when Type is set to Two-Sided Stream on Edges and Faces.
Specify Vector	Appears when Type is set to One-Sided Stream on Faces or Two-Sided Stream on Faces.Lets you specify the direction of the thermal stream.
Cylindrical CSYS	Appears when Type is set to One-Sided Stream on Faces (Cylindrical Components) or Two-Sided Stream on Faces (Cylindrical Components).Specifies the cylindrical coordinate system. The available options are User-Defined and Global Cyclic Analysis. The second option is available if you have a predefined cyclic symmetry cylindrical coordinate system.
CSYS	Appears when Cylindrical CSYS is set to User-Defined.Lets you specify the cylindrical coordinate system with its origin.
RadialCircumferentialAxial	Appear when Type is set to One-Sided Stream on Faces (Cylindrical Components) or Two-Sided Stream on Faces (Cylindrical Components).Set the radial, circumferential, and axial components of the stream flow direction with respect to the selected cylindrical CSYS.
Auto-Connect Options
Automatically Determine Mass Flow	Determines the stream mass flow from connected streams that are upstream of the current stream.
Automatically Determine Inlet Temperature	Determines the stream inlet temperature from connected streams that are upstream of the current stream.
Automatically Determine Reverse Mass Flow	Determines the stream reverse mass flow from connected streams that are downstream of the current stream.
Automatically Determine Reverse Inlet Temperature	Determines the stream inlet temperature from connected streams that are downstream of the current stream.
Fluid
Fluid Materials	Assigns a fluid material or a multiple fluid material to the 1D stream elements that the thermal solver creates at solve time.Select a material from the list of materials assigned to the model, or click Choose material to define a new material.
Stream Conditions
Mass Flow	Appears when the Automatically Determine Mass Flow is cleared.Sets a value for the inlet mass flow of the stream. For more information, see Additional magnitude options.
Inlet Temperature	Appears when the Automatically Determine Inlet Temperature is cleared.Sets a value for the inlet temperature of the stream. For more information, see Additional magnitude options.
Pressure	Sets a value for the pressure of the stream. The pressure is uniform in space over the length of the stream. For more information, see Additional magnitude options.
Rotational Effects	Specifies how to account for total temperature effects in convective heat transfer due to rotating parts.Neglect Wall RotationUse this option when the components that surround the fluid are stationary or when the components are rotating at low speeds, for example in heat transfer to a stator. The inlet temperature that you specify for the stream is assumed to be the absolute total temperature, Tt,abs.Correct for Wall RotationUse this option when the components that surround the fluid are rotating. For two-sided thermal streams, the speed of the two components can be different. The inlet temperature that you specify for the stream is assumed to be the absolute total temperature.Relative Temperature Reference FrameUse this option when components that surround the fluid are rotating. For two-sided thermal streams, the speed of the two components must be identical. The inlet temperature that you specify for the stream is assumed to be the relative total temperature, Tt,rel.
Heat Transfer/Heat Transfer — Side A/Heat Transfer — Side B
The Heat Transfer group appears when Type is set to One-Sided Stream on Edges, One-Sided Stream on Faces, or One-Sided Stream on Faces (Cylindrical Components). Heat Transfer — Side A and Heat Transfer — Side B groups appear when Type is set to Two-Sided Stream on Edges, Two-Sided Stream on Faces, Two-Sided Stream on Faces (Cylindrical Components), or Two-Sided Stream on Edges and Faces.
Area for Internal Edges	Appears when the One-Sided Stream on Edges, Two-Sided Stream on Edges, or Two-Sided Stream on Edges and Faces type is selected.Specifies how to compute the convective area for loads applied to the internal edges of 2D elements having different thicknesses on either side.Subtract ThicknessesSubtracts the thicknesses of the internal edges and takes the absolute value of the subtraction.Add ThicknessesAdds the thicknesses of the internal edges and takes the absolute value of the addition.
Area Correction	Specifies how the solver corrects the convective area.NoneDoes not account for area correction.FactorDefines the area correction factor to compute the corrected convective area. You specify the value in the Area Correction Factor box.OverrideDefines the corrected convective area. You specify the value in the Area Override box. This option is only available when Area for Internal Edges is set to Add Thicknesses.
Heat Transfer Coefficient	Sets a value for the heat transfer coefficient. For more information, see Additional magnitude options.
Heat Pickup	Sets a value for the heat pickup. The heat pickup is an additional energy source on the fluid-solid interface. For more information, see Additional magnitude options.
Swirl Input Type	Specifies how the swirl of the stream is defined. The thermal solver uses the specified value to relate total temperatures and relative temperatures.Swirl VelocityDefines a swirl velocity, vΦ. You specify the value in the Swirl Velocity box. For more information, see Additional magnitude options.Swirl RatioDefines a swirl ratio, ωfluid/ωrotor. You specify the value in the Swirl Ratio box. For more information, see Additional magnitude options.Relative Temperature DifferenceDefines a relative temperature difference, ΔTrel. You specify the value in the Relative Temperature Difference box. For more information, see Additional magnitude options.Same as Side ADefines the swirl input of side B of a two-sided stream using the same values you specified for side A. This option appears only in the Heat Transfer — Side B group.
Use same Heat Transfer as Side A	Appears only in the Heat Transfer — Side B group.Defines the heat transfer settings for side B of a two-sided stream using the same values you specified for side A.When you clear this check box, you can specify different values for the heat transfer coefficient and the heat pickup for side B of a two-sided stream.
Inlet Conditions — Flow Reversal
Appears when one or both of the following check boxes are cleared: Automatically Determine Reverse Mass Flow or Automatically Determine Reverse Inlet Temperature .When Automatically Determine Reverse Mass Flow is selected, but Automatically Determine Reverse Inlet Temperature is cleared, you must set the reverse inlet temperature value.Conversely, when Automatically Determine Reverse Inlet Temperature is set, but Automatically Determine Reverse Mass Flow is cleared, you must set the reverse mass flow value.
Specify Flow Reversal Conditions	Defines inlet conditions for the reversal of the flow. When you select this check box, you must specify the values for mass flow and inlet temperature for the opposite boundary of the stream.
Mass Flow	Appears when Specify Flow Reversal Conditions is selected and the Automatically Determine Reverse Mass Flow is cleared.Sets a value for the mass flow of the stream on the opposite boundary of the stream. When the value for the flow reversal mass flow is positive, flow reversal conditions are met and the stream direction is reversed. For more information, see Additional magnitude options.
Inlet Temperature	Appears when Specify Flow Reversal Conditions is selected and the Automatically Determine Reverse Inlet Temperature is cleared.Sets a value for the inlet temperature of the stream on the opposite boundary of the stream. For more information, see Additional magnitude options.

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Thermal Stream dialog box, Simcenter 3D 2021.1 Series

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