Printed Circuit Board dialog box (Thermal/Flow/ESC/SST)

Name
Name	Sets a name for the simulation object.This name appears in the Simulation Navigator.Description opens a text editor that you can use to type a description for the simulation object.
Destination Folder
Simulation Object 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.
Region
Region	Specifies a region for the PCB. You can click Create Region to create a new region. Only faces or elements can be selected in the region.After you select a region, use Edit to modify it.
Top Surface/Bottom Surface
Available only in Simcenter 3D Electronic Systems Cooling solver environment.
Wall Treatment	Specifies how the flow solver models the near-wall region of a flow surface.No Slip WallResolves the flow field in the near-wall region, including the viscous sublayer. Your model requires a finer mesh near the wall.Slip WallEliminates any surface drag calculations for the surface of the blockage and assigns automatic convection properties.Wall FunctionProvides near-wall boundary conditions for the momentum and turbulence transport equations without resolving the viscous sublayer. Applicable only when you also select K-Omega, SST — Shear Stress Transport, or LES — Large Eddy Simulation from the Turbulence Model list on the Solution Details page in the Solution dialog box.Note: The implementations of the Standard K-Epsilon, RNG K-Epsilon, Realizable K-Epsilon and Mixing Length turbulence models always use wall functions.Hybrid Wall FunctionUses enhanced wall functions that are less sensitive to the first layer y+ values and provides a more robust performance upstream of the separation point in comparison with standard wall functions. Hybrid wall functions transition smoothly between wall-resolved (no slip) and wall function corrected treatments based on local grid quality.Applicable only when you also select K-Omega or SST — Shear Stress Transport from the Turbulence Model list on the Solution Details page in the Solution dialog box.Note: A single solution can only contain one type of wall functions: you cannot specify standard wall functions on some surfaces and hybrid wall functions on others. A combination of flow surfaces with and without wall functions is allowed.For more information see Meshing for turbulence modeling.
Wall Friction	Available when Wall Treatment is set to anything except Slip Wall.Specifies how the software calculates wall friction. Smooth – With FrictionApplies the drag on a smooth wall. The flow solver computes the drag force by integrating the shear stress over the wall surface.Rough - From Mounted ComponentsUses correlations appropriate to the defined obstructions to determine local drag on each element of the Flow Surface and the specified obstruction. It uses any geometry selected in a PCB Component simulation object as obstruction.Rough Applies drag on a rough wall. The roughness effect is included in computation using the Sand Grain Roughness Height value that you specify. Surface roughness tends to increase convection heat transfer by introducing flow turbulence.Note: The specified Sand Grain Roughness Height value must not exceed the size of the fluid elements next to the surface.
Convection Properties	Specifies the convection characteristics at the surface. You can click Create Modeling Object to create a new convection property modeling object.After you select a convection property, use Edit to modify it.

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Printed Circuit Board dialog box (Thermal/Flow/ESC/SST), Simcenter 3D 2021.1 Series

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