Define No Slip Walls

Use the No Slip tool to define physical walls in the simulation domain.

No-slip specifies the velocity of the fluid at the surface of the wall. For example, for a stationary wall in viscous flow, a wall boundary condition would change all the components of the velocity to zero.

Select the surfaces or thin solids on which to apply the boundary condition.

To Select	Do This
Surfaces	Select surfaces in the following ways: While in the Flow ribbon, select surfaces, then right-click and select Assign Wall > No Slip from the context menu. From the Flow ribbon, click the No Slip tool. Figure 1. Select surfaces.
Thin Solids	From the Flow ribbon, click the No Slip tool. Figure 2. Change the guide bar selector to Thin Solids. Select thin solids. Note: You can only select thin solids if layers have been defined using the Thin tool. Select a direction option from the guide bar. Direction: Away from Parent Surface - Define the condition on the boundary surface furthest from the parent surface. Direction: Adjacent to Parent Surface - Define the condition on the boundary surface closest to the parent surface. Direction: Both Sides - Define the condition on both sides of the boundary surface.

To Select

Do This

Surfaces

Select surfaces in the following ways:

While in the Flow ribbon, select surfaces, then right-click and select Assign Wall > No Slip from the context menu.
From the Flow ribbon, click the No Slip tool.

Figure 1.

Select surfaces.

Thin Solids

From the Flow ribbon, click the No Slip tool.

Figure 2.
Change the guide bar selector to Thin Solids.
Select thin solids.
Note: You can only select thin solids if layers have been defined using the Thin tool.
Select a direction option from the guide bar.
- Direction: Away from Parent Surface - Define the condition on the boundary surface furthest from the parent surface.
- Direction: Adjacent to Parent Surface - Define the condition on the boundary surface closest to the parent surface.
- Direction: Both Sides - Define the condition on both sides of the boundary surface.

In the dialog, input values for each tab.
- Turbulence
- Temperature
  Note: This tab only becomes available if the Heat Transfer option is turned on in the Flow ribbon Physics tool.
- Setting
From the guide bar, execute the command in the following ways:
- Click to confirm your selection and remain in the tool.
  This allows you to continue creating instances and helps you visualize and edit instances with the legend.
- Click to confirm your selection and exit the tool.