Hi thanhttdt,

I created a named selection using the Worksheet option to select Element Faces within a range of X and Y coordinates as shown below.

However, when I tried to use that Named Selection in a Pressure, it wouldn't take it. I wonder if someone knows why.

I also tried to make a Named Selection of Nodes, and couldn't get that to show up in a Force assignment either.

I was using ANSYS 18.2.   What version are you using?

Best regards,