Assigning boundaries to single block plot3d mesh in ICEM CFD
 

Hi everyone,

I have a single block 3D plot3d mesh loaded in ICEM, and I need to assign boundary conditions to certain regions of the mesh (for Fluent). Upon import, the grid appears as a single surface in the part tree as MODEL>PARTS>DEFAULT_SUBFACE (picture attached).

In order to create a boundary condition, I think I need to "create part by selection", but I have not found a way to select the region I want since ICEM sees the grid as a single surface. Is there a way to "smart-select", if you will, a region of the mesh and assign it to a boundary? Or does ICEM require that each boundary face be defined as its own block in a multiblock plot3d file?

I have attached my mesh as a .txt file (can be renamed to .xyz and imported to ICEM).

Thank you,
Marshall

I figured it out! Create a part from selection (right click parts>create>from selection). Select a cell face (left click) on the face of the boundary you want to specify. Set the angle to the threshold (maximum) angle that any two cells on a given face will be relative to each other, then click the left-most paint bucket to autofill. For instance, if you have a perfect cube or rectangular prism, you could set the angle up to 89 deg and the autofill option would select only the cells on the desired face. (screenshot attached).

Hopefully this helps someone!