Learning Forum

[Glenn]

Hi.  I am VERY new to ANSYS Academic (2019 R2) and am learning as I go....please be gentle with me lol

I have created a solid object in TurboCAD, saved as a .STEP file and imported into Workbench.  I generated an input, output, wall and fluid Named Selection.  When I generate the mesh I always get a response saying "One or more entities failed to mesh".  I have right clicked the message to view the areas in question but for the life of me (and with my limited knowledge) I cannot work out why.  

To me it appears that the areas in question are not included in either the "wall_boundary" or "interior_fluid" named selections.  I tried recreating these by using the rightclick-select all then for the "wall-boundary" de-selecting the inlet and outlet (3 faces total).  I would have thought this would definitely pick up any stray entities/faces but it appears not to.

Where am I going wrong?  Maybe it is something much more technical??

[peteroznewman]

Hi Glenn,

I recommend you idealize the geometry a bit before you try to mesh it.  For example, there is a 0.1 mm thick tab, is that feature important? Probably not. So trim it off. 

You can enable automatic Mesh defeaturing, which will take this out, but it is cleaner to do it manually.

I don't know TurboCAD, but the surfaces that make the 90 degree bend at the end are horrible and full of ripples. When you have the mesh set to Capture Curvature, as you did, it makes smaller elements just to capture these ripples, which I don't believe are there intentionally. 

When you turn off Capture Curvature, and enable Mesh Defeaturing, you get a valid mesh.

 ANSYS 2019 R2 archive attached.

[Glenn]

Cheers Peter.  I will look into cleaning it up either manually or automatically and turn off the curvature thing (not sure that I knew that setting was on lol).

 I did notice that looking under Mesh in the Outline window there is a black cross against Patch Conforming Method.  Not sure if this means you did not use this?

Appreciate the help.

[Glenn]

I copied all of Peter's settings (as shown in the Details box when selecting Mesh in the Outline window) and mine didn't work. 

Will keep looking into it but maybe this is due to me having a student copy of the software....

[peteroznewman]

Yes, the X means I suppressed the Patch Conforming mesh control, which is the same as deleting it. I also added Virtual Topology to the model, which I did not mention in the post above. That may have helped.