Dears, I'd like to know how to apply a linear force to a surface, such as water pressure on the surface.
The user menual said that the variable load is not applicable for surface load, but could anybody give me a detailed instruction to apply such kind of load? I'm sorry to post such basic question here cause I am really a newbie. Appreciate for any advise.
Solved! Go to Solution.
Use a Data Surface. In this case, you can use either a Between Coordinates Data Surface, or an Equation Data Surface.
For both types, lets assume p1 = 2.5 and p2 = 5.0. applied to one face of a 10 X 10 X 10 cube.
For the Between Coordinates Data Surface create the entries for the Data Surface as shown below.
Then when creating the Pressure Load on the surface, you apply a value of 1 for the Pressure (the multiplier times the value of the Data Surface) and select the Data Surface as shown below.
For the Equation Data Surface, you should first define a Coordinate System (Csys) as a reference for the values. In this case, I created a CSys at the base of the cube (CSys 3). Then, create an Equation Data Surface referencing the Csys as shown below. The characters "!z" refer to the element centroid's Z position.
After applying the load in both cases, it will appear as follows:
When solving, the load is expanded as pressure loads on the element faces and will look like this if you manually expand the load.
I use Model, Load, On Surface... then I select pressure
then I choose the variable method and I put the equation of the hydrostatic load referred to a proper coordinate system
In this case Femap shows the main constant factor "1" but I think the results are correct.