[Gmsh] Controlling Mesh Size in GUI
Rudin, Andrew
Andrew.Rudin at austintexas.gov
Tue Dec 13 16:26:43 CET 2011
Okay, I see how to modify the mesh size by editing variable in the.geo file, reload geometry in the GUI, and then rebuild the mesh.
Thank you so much.
-----Original Message-----
From: gdmcbain at gmail.com [mailto:gdmcbain at gmail.com] On Behalf Of Geordie McBain
Sent: Monday, December 12, 2011 9:34 PM
To: Rudin, Andrew
Cc: gmsh at geuz.org
Subject: Re: [Gmsh] Controlling Mesh Size in GUI
2011/12/13 Rudin, Andrew <Andrew.Rudin at austintexas.gov>:
> I'm new to Gmsh and I'm trying to learn the basics from the GUI interface.
> I'm trying to play with building a 2-D mesh on a simple box and then
> inspect the output as I change mesh parameters. I'm trying to
> manipulate the average size of each triangle in the mesh, but the output is not changing.
> Here's some of the things I've tried.
>
> -Open 2.5 GUI
> -Add 4 points at [0,0], [100,0], [100,100], and [0, 100] -Draw lines
> between the points to create a square -Create planar surface from
> lines.
> -Create 2D mesh by going to Mesh->2D
> -a basic mesh is created, average triange area appears to be about
> 1 square units of a 10,000 square unit box
>
> Here's the problem. Now I want to control the size and dicate every
> triangles area should be about 100 square units.
>
> -Set mesh 'element size factor' to 100 by going to
> Tools->Options->Mesh->Change element size factor to 100, then on the
> Tools->Options->Mesh->main
> Gmsh GUI go to Mesh->2D to rebuild
>
> After this the mesh does not seem to resize to have bigger triangles
Hello. I'm sure there is a way to do this in the GUI, but I only really use the script input myself; here's how to do it that way.
Running the attached size.geo produces 28 elements, then editing the first line to reduce lc to 10 and then 1 produces instead 286 and 26900 elements.