Answer:
A free variable load allows you to apply a load on surfaces that can vary in height and perimeter.
Image 01 shows a circular container that is only subjected to loads over half of the perimeter in the direction of the surface normal. To define a load varying along the perimeter, it is necessary to activate the "Varying" option under "Along perimeter". Then you can use the corresponding button to enter the factors for the load, including the angle under which these factors occur. Furthermore, you can define the rotation axis. The factor kα creates a reference to the load value p of the initial dialog box.
As an alternative, it is possible to split the surface into the corresponding surface components. Subsequently, you can apply a surface load to the relevant surface components.
The container shown in Image 01 has been modeled with two partial surfaces in Image 02. This means that a surface load can be applied to the half of the container that is to be subjected to the load.
