[ANSYS Meshing] sweep meshing issue ansys 18.0

CeesH · August 21, 2017, 06:15

Dear all,

For some reason, Sweep meshing in ansys 18.0 is not working out for me. It's consistently giving me a tetrahedral mesh, in cases where full hexahedral sweep meshing worked just fine in earlier versions of ANSYS. Did anyone else run into this issue? And are there any solutions?

Best,
Cees

siw · August 22, 2017, 06:26

Are you certain the body is sweepable? Right-click in the Meshing Tree to show all sweepable bodies and see if it is highlighted. For instance, there could be an unexpected vertex on a edge which needs fixing. I've used the sweep method countless times in R18.

CeesH · August 22, 2017, 07:19

It certainly is; I have now reverted to v15 (which was still installed on my workstation) to do the meshing, and there's absolutely no issues there.

mvoss · August 24, 2017, 03:26

Did you set the sweep algorithm by hand? I am asking since you are saying that you get a Tet-mesh every time. Otherwise get in contact with your Software dist. and report a bug.

Sent from my iPhone using CFD Online Forum mobile app

CeesH · August 24, 2017, 03:36

yes, I pretty much tried out every option there...
So oddly noone else seems to have this issue?

siw · August 24, 2017, 08:52

Maybe you can upload the geometry to see if other get the issue.

CeesH · August 24, 2017, 12:40

The specific geometry is proprietary, but it isn't a geometry dependent problem. It also happens when I make a simple ring-cut geometry. So let's say:

1: make a cylinder (r = 1, h = 1)
2: cut out a second cylinder (r = 0.5, h = 1) to create a ring
3: slice in half, and suppress one half.

In previous versions, I could very easily sweep the mesh around the axis (and combined with size control on the edges, make very neat hex meshes). In 18.0, this doesn't happen. It mostly makes tets, and if it does make hex, it's not swept but hex-dominant (and poorer in quality)

siw · August 25, 2017, 05:51

I just followed your instructions and by default ANSYS Meshing made a swept mesh. This was all in ANSYS R18.2.

CeesH · August 25, 2017, 09:05

Nice and curvy, that's how I like my meshes. I'm currently working on some simulations (with my wonderful ansys 15 mesh), but I'll see if I can make a few shots of what it looks like for me afterwards in the standard geometry. Mine are 18.0 though, we are yet to update.

August 21, 2017, 06:15	sweep meshing issue ansys 18.0	#1
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	Dear all, For some reason, Sweep meshing in ansys 18.0 is not working out for me. It's consistently giving me a tetrahedral mesh, in cases where full hexahedral sweep meshing worked just fine in earlier versions of ANSYS. Did anyone else run into this issue? And are there any solutions? Best, Cees

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August 22, 2017, 06:26		#2
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 742 Rep Power: 26	Are you certain the body is sweepable? Right-click in the Meshing Tree to show all sweepable bodies and see if it is highlighted. For instance, there could be an unexpected vertex on a edge which needs fixing. I've used the sweep method countless times in R18.

August 22, 2017, 07:19		#3
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	It certainly is; I have now reverted to v15 (which was still installed on my workstation) to do the meshing, and there's absolutely no issues there.

August 24, 2017, 03:26		#4
mvoss Senior Member Matthias Voß Join Date: Mar 2009 Location: Berlin, Germany Posts: 449 Rep Power: 20	Did you set the sweep algorithm by hand? I am asking since you are saying that you get a Tet-mesh every time. Otherwise get in contact with your Software dist. and report a bug. Sent from my iPhone using CFD Online Forum mobile app

August 24, 2017, 03:36		#5
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	yes, I pretty much tried out every option there... So oddly noone else seems to have this issue?

August 24, 2017, 08:52		#6
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 742 Rep Power: 26	Maybe you can upload the geometry to see if other get the issue.

August 24, 2017, 12:40		#7
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	The specific geometry is proprietary, but it isn't a geometry dependent problem. It also happens when I make a simple ring-cut geometry. So let's say: 1: make a cylinder (r = 1, h = 1) 2: cut out a second cylinder (r = 0.5, h = 1) to create a ring 3: slice in half, and suppress one half. In previous versions, I could very easily sweep the mesh around the axis (and combined with size control on the edges, make very neat hex meshes). In 18.0, this doesn't happen. It mostly makes tets, and if it does make hex, it's not swept but hex-dominant (and poorer in quality)

August 25, 2017, 09:05		#9
CeesH Senior Member Cees Haringa Join Date: May 2013 Location: Delft Posts: 607 Rep Power: 0	Nice and curvy, that's how I like my meshes. I'm currently working on some simulations (with my wonderful ansys 15 mesh), but I'll see if I can make a few shots of what it looks like for me afterwards in the standard geometry. Mine are 18.0 though, we are yet to update.