Setting Boundary Conditions and Values

The geometry used for this tutorial has six boundaries, three of which will have no-slip wall conditions assigned to them. Of the remaining three boundaries, two will be defined as pressure outlet boundaries and the last one as a symmetry plane.

Open the Regions node, then right-click the Default_Fluid 2 node and select Rename...

Enter the name Fluid and click OK.

Open the Fluid > Boundaries node, then use the <Ctrl><Click> method to select the Middle, TopLeft and TopRight nodes. These are the three wall boundaries.

In the Properties window, select Type Wall.

Using <Ctrl><Click> again, select the Left and Right nodes and change their Type to Pressure Outlet in the Properties window.

The only boundary conditions that need to be specified are those for the two pressure boundaries.

In the Left node, select the Physics Values > Static Pressure > Constant node.

Set the Value property to 5e7 Pa.

Select the Volume Fraction > Constant node.

In the Properties window, click on the Value box to open the Constant - Value dialog.

Change the H2O value to 1.0

Leave the Air and H2O (G) values as 0.0 and click OK

This in effect enforces the condition that only liquid water may enter the solution domain through that boundary.

In the Right node, select the Physics Values > Volume Fraction > Constant node.

In the Properties window, click on the Value box to open the Constant - Value dialog.

Change the Air value to 1.0

Leave the H2O and H2O (G) values as 0.0 and click OK

This in effect enforces the condition that only air may enter the solution domain through that boundary.