To apply a variable pressure load to a surface

To apply a pressure load which varies linearly across a surface, use the following procedure.

Note: The selected surfaces must all have the same number of nodes.

Select the surfaces that will have the same variable surface load applied.
On the Surface ribbon tab, select the Variable Pressure tool in the Loads group.

The Add: Surface Variable Pressure Load dialog opens.
Select the Load group or case to which the load will be added from the drop-down list.
Select the Direction of the load.
Select the direction in which the load varies from the Variation along element drop-down list.

Enter the pressure values at each end of the variable pressure load:

For…	Do this…
Joint	select the joint for three corners and then type the load values at each
A local axis	type the pressure value to use at each end

Click OK.

The dialog closes and the load is applied to the selected surfaces.

You can edit variable pressure load values for the current load group or load case by selecting the Variable pressure on surface tool in the Surfaces group on the Spreadsheet ribbon tab.