Flip Surface Normals in Starccm+

Fluidentity13 · December 21, 2022, 10:06

Hello Everyone,

So I am developing Macros to run simulations on Pipes.
I close the surfaces of the original Pipe Geometry using Fill Surfaces in Surface Repair & wrap the internal Fluid_Volume. Let's call these two geometries Pipe & Fluid_Volume.

Then I want to create Surface Extruder Operation to extrude outlet & Inlet using the surfaces defined when closing the Pipe.

There aren't enough options to properly direct this extrusion so I am using Surface normal. Now the problem is the newly created Inlet & Outlet surfaces are created with wrong direction of surface normal in some cases. Which leads to error with running Surface Extruder Operation.

ERROR: orientFaces: Sidedness has an error.

My Goal is to flip the surface normals for these Inlet & Outlet Faces in the Pipe. If anyone can suggest something else to effectively automate the whole operation, I'd love that too.

P.S. I don't want to use the wrapped geometry for Extrusion because it creates topological errors while meshing in majority of cases.

Maddin · December 23, 2022, 13:56

Never had this condition - only surfaces which haven't been "straight". Extrusion with direction worked.
Can you try negativ Extrusion?

December 21, 2022, 10:06	Flip Surface Normals in Starccm+	#1
Fluidentity13 New Member Aman Sangal Join Date: Mar 2021 Posts: 22 Blog Entries: 2 Rep Power: 5	Hello Everyone, So I am developing Macros to run simulations on Pipes. I close the surfaces of the original Pipe Geometry using Fill Surfaces in Surface Repair & wrap the internal Fluid_Volume. Let's call these two geometries Pipe & Fluid_Volume. Then I want to create Surface Extruder Operation to extrude outlet & Inlet using the surfaces defined when closing the Pipe. There aren't enough options to properly direct this extrusion so I am using Surface normal. Now the problem is the newly created Inlet & Outlet surfaces are created with wrong direction of surface normal in some cases. Which leads to error with running Surface Extruder Operation. ERROR: orientFaces: Sidedness has an error. My Goal is to flip the surface normals for these Inlet & Outlet Faces in the Pipe. If anyone can suggest something else to effectively automate the whole operation, I'd love that too. P.S. I don't want to use the wrapped geometry for Extrusion because it creates topological errors while meshing in majority of cases.

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December 23, 2022, 13:56		#2
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Never had this condition - only surfaces which haven't been "straight". Extrusion with direction worked. Can you try negativ Extrusion?