[Gmsh] 2D mesh error message

Yao-Cheng Tien yaocheng2010 at gmail.com
Fri Jan 16 08:11:18 CET 2015


Hi Mikhail,

I have attached three more testcases. I have tried to embed 10k, 50k, and
100k lines(with length 1) to a surface separately. The element size is 1.

The issue is that the 2d mesh(meshAdapt) works for 10k and 50k after
setting the Mesh.RandomFactor to 1e-6. However, the 100k one fails even
when I increase the Mesh.RandomFactor to 1e-4. The error message is
"Identical points in triangulation: increase element size or
Mesh.RandomFactor"

My questions are:
1. Is there any limit about the number of embedded lines? 100k embedded
lines are too much?
2. Any setting I missed to make it work?

Thank you!

Best,
YC

On Thu, Jan 15, 2015 at 8:59 AM, Yao-Cheng <yaocheng2010 at gmail.com> wrote:

> Hi Mikhaul,
>
> My mistake. I'm trying different settings to fix that actually. The
> original geo file indeed has lc=1 but still fails. I have also tried lc=0.1
> 0.5.
>
> I know it's ok if I have only 1 line or even 10k lines. But in my
> situation, I probably need to have up to 1 million lines. Any suggestion?
>
> Thank you.
>
> Best,
> YC
> > On Jan 15, 2015, at 6:26 AM, Mikhail Artemyev <
> artemiev.mikhail at gmail.com> wrote:
> >
> > Hi,
> >
> > Your lines have length 1, while the characteristic length of the mesh
> you defined was 10.
> > What happens if you set lc = 1?
> > With only one line embedded it works fine for me (and
> RandomFactor=1e-8), but I didn't try for all 50K of them.
> >
> > Best,
> > Mikhail
> >
> >
> >> On 01/15/2015 02:29 AM, gmsh-request at ace20.montefiore.ulg.ac.be wrote:
> >> Hi,
> >>
> >> I have encountered the issue "*Identical points in triangulation:
> increase
> >> element size or Mesh.RandomFactor*" in my 2D geometry file. After
> looking
> >> into previous support mails, I changed the Mesh.RandomFactor to 1e-8,
> 1e-7
> >> until 1e-2. However, it still fails. Could you tell me what other
> option I
> >> should try since I am pretty new to Gmsh?
> >>
> >> My geometry is simple. I have a surface with size 1100 by 210. Also,
> there
> >> are 50K lines with length 1 embedded in that surface.
> >>
> >> Thanks for your help in advance!
> >>
> >> Best,
> >> YC
> >
>
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