COMSOL 6.3 - Creeping Flow

There are several methods to select a geometric entity. To select, for example, a boundary, place the cursor over the boundary in the graphics window. If the required boundary is not highlighted in red then rotate the scroll wheel until it is highlighted, then left–click to select it (the up and down arrow keys can also be used instead of the scroll wheel). Alternatively, use the Selection list to display a list of the available boundary numbers (available from the Home > Windows menu if you are using windows, or from the Windows menu on other platforms). For more information about selecting geometric entities in the Graphics window, see the COMSOL Multiphysics Reference Manual.

1

In the Model Builder, under Component 1 click Creeping Flow

Several default nodes are added automatically to the model tree. The

‘D’ in the upper left corner of the node indicates these are default nodes.

Add a fully developed flow inlet boundary condition.

1

In the Physics toolbar, click Boundaries

and choose Inlet.

2

Select Boundary 2 and 10 only.

3

In the Settings window for Inlet, locate the Boundary Condition section. From the Boundary condition list, choose Fully developed flow.

4

Locate the Fully developed flow section. Click the Flow rate button.

-

In the V0 text field, type fr/2.

The flow rate is set to one half of the parameter value, since only half of the geometry is modeled.

Add an outlet with a pressure boundary condition.

1

In the Physics toolbar, click Boundaries

and choose Outlet.

2

Select Boundaries 23 and 25 only.

The default pressure of 0 Pa is appropriate in this case.

Add a symmetry boundary condition in the symmetry plane.

1

In the Physics toolbar, click Boundaries

and choose Symmetry.

2

Select Boundaries 4 and 9 only.