Flow Blockage dialog box — Solid Blockage options

Name
Name	Defines the simulation object name.Description opens a text editor to let you type a description for the boundary condition.
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
Group Reference	Applies the flow obstruction to the selected group.For more information, see Group Reference options.
Select Object	Lets you select a polygon body to use as the flow obstruction. The surfaces of the polygon body must mate with the 3D flow mesh.Excluded lets you remove individual entities from within your selected object.
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.
Surface
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 computes 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 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	Controls how the Flow Blockage convects to the fluid.By default, all Solid type Flow Blockage objects convect to the fluid using convection properties defined in the 3D Flow node in the Solution dialog box. You can override these properties with a Convection Properties type modeling object. Select Automatic to allow the flow solver to calculate local convection properties for each element on the Flow Blockage.Select a Convection Properties type modeling object from the list to apply those convection properties to the blockage, or click Create Modeling Object to define a new modeling object.Click Edit to modify the specified modeling object.See Convection Properties for more information.

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Flow Blockage dialog box— Porous Blockage - Isotropic options

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Flow Blockage dialog box — Solid Blockage options, Simcenter 3D 2021.1 Series

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