April 16, 2019 at 4:12 pm
April 16, 2019 at 4:17 pmRobAnsys Employee
It could be the defeaturing trying to close off the angle. If you put a section plane along the tube axis (show full cells) how does it look?
April 16, 2019 at 4:23 pm
April 16, 2019 at 4:38 pm
April 16, 2019 at 4:43 pm
April 16, 2019 at 4:55 pmBiomedModellerSubscriber
Sorry to spam a lot, I am just trying to provide enough info to shorten the convergence time to the ultimate solution.
To clarify further, I am using ICEM, not the ansys mesher. Path independent, all Tri is set. I could not find the defeaturing tolerance in ICEM. Could you direct me towards that to test modulating it?
April 17, 2019 at 11:12 amRobAnsys Employee
Not a problem and those are the images I was after. I don't know how to use ICEM CFD: I last used it's predecessor (Geomesh) about 20 years ago!
Not sure what's causing the problem to the right of your images: the mesh should be good where the angle between the bodies is large. Where you see the pinch in the bottom image you may need to trim the model slightly to blunt the sharp angle.
Given you're using tet's I'd switch to ANSYS (Workbench) Meshing as you'll have a few other tools to clear up the mesh.
April 17, 2019 at 1:30 pmBiomedModellerSubscriber
Thanks a lot rwoolhou!
Modifying the geometry in this specific case might be straight forward to avoid the sharp angle. However, I need to fix the same issue for a more complex patient-specific geometry, wherein by no means I can manually fix the entire artery.
Is there any setting in ICEM I can manipulate to get it? Could you please forward this post to any colleague who is expert in ICEM?
April 22, 2019 at 8:59 amKeyur KanadeAnsys Employee
you may want to check fluent meshing for this.
April 22, 2019 at 8:59 amKeyur KanadeAnsys Employee
May 9, 2019 at 8:41 pmBiomedModellerSubscriber
I fixed the problem with the combination of Global sizing, curvature/proximity, and edge criteria.
The problem now is it takes hours to mesh, and it freezes and crashes on the full model.
Anyone can help me with how I can run ICEM on cluster? The problem is X11 Forwarding.
July 22, 2019 at 2:40 pm
July 24, 2019 at 3:42 pmRobAnsys Employee
Providing there's little/no flow in that region I'd leave it as is. If the cells are skew have a look at the cell zone separation options.
July 25, 2019 at 7:17 pmBiomedModellerSubscriber
Thanks for the reply. CFX works with that low quality mesh, but Fluent gives an error. I will try to divide the zone into two and only put the prism outside this vicious location
July 26, 2019 at 12:26 pmRobAnsys Employee
It's more that CFX uses a node spacing rather then cell shape: it's why CFX can struggle with high aspect ratio cells that are OK in Fluent.
August 1, 2019 at 3:21 pmBiomedModellerSubscriber
The solution of cell zone separation might work for simple geometries (Tried it, worked), but impossible for the real application (See 8th post from the top).
Is there a chance to upload the geometry somewhere private to get your (or other colleagues') comment on it? I am not allowed to publicly share the case.
May I also add another moderator to this talk? I would be pleased to involve Peteroznewman to this loop please.
August 2, 2019 at 10:42 amRobAnsys Employee
Feel free to ask Peter: it's a forum so I think you just have to hope he looks in.
There isn't a private part to the Community. As you're the ASC you can see if you can log a support ticket with us directly: the local team can then have a look.
August 2, 2019 at 3:17 pmBiomedModellerSubscriber
Thanks a lot for the reply. I will.
How to ask Peter? I know no way to add him to this conversation or send him this post as a message.
August 2, 2019 at 4:48 pmpeteroznewmanSubscriber
Do as rwoolhou suggests and see if you can log a support ticket.
I am also willing to look at your mesh, but I don't use ICEM, I am good at ANSYS meshing. If you reply with your email ID, I will send you an email that you can reply privately with a link to the model. I will remove your email ID from the post as soon as I read it. I will be checking this site for the next 10 hours.
August 2, 2019 at 5:00 pmpeteroznewmanSubscriber
Got it. Sent you an email.
August 2, 2019 at 5:12 pmBiomedModellerSubscriber
Attaching the files now
September 3, 2019 at 4:09 pm
September 4, 2019 at 3:32 pmRobAnsys Employee
That looks like the surfaces have collapsed onto each other. If the surfaces still exist (check visually) you may need to wrap them. Difficult to say without the files, and that's not something I can do via the Community (we do keep asking but it's export law related).
September 5, 2019 at 12:46 pmBiomedModellerSubscriber
Thanks for the reply.
They have not collapsed and the surfaces do exist.
Wrapping has already been done.
Here I suspect the problem is the tolerance of the curves. I did not have this issue (for curves) in ICEM. But as we couldn't fix the mesh near where two surfaces were tangent and very close, we switched to Fluent meshing per the suggestion of "KKenade". Now we have solved those meshing problems and, as you can see from the above image, the problem of mesh fidelity to the curves and low resolution (tolerance issue?) problems for curves arise.
Regarding the communication problem of file sharing, I cannot agree more. It really hurts both ends of this communications considerably reducing the usefulness of these correspondences.
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