A few questions about Gmsh: Background Mesh and Tutorial 7

SeanQuallen · August 22, 2015, 12:30

Hello all!

I'm learning how to use Gmsh by going through the tutorials they've provided. However I've come to tutorial number 7 (t7) and am now stuck at the 'background mesh'. Here are a few questions, if one of you would be so kind as to help out:

First, what is a background mesh, anyway? There's no definitive answer to this that I've been able to find. It looks to be some pre-defined field that somehow gets interpolated into my mesh-space (??), but I have no real clear idea as to its concept and purpose.
Second, has anyone run this tutorial 7 provided by Gmsh? It's only 3 lines and the final line sets up a background mesh view. Am I supposed to continue on with that? Is that supposed to provide a mesh for me? The program hangs when I attempt to mesh 2d so I'm assuming something has not worked.

I'd appreciate any help offered to these questions! Thanks!

Sean

SeanQuallen · August 23, 2015, 15:31

Sorry all, it was user failure. The smoothing steps option had accidentally been set to a very high value. Deleting it from my .gmsh-options solved that.

NEEL8007 · November 27, 2017, 04:28

i did terahedral but i want regular hexahedral meshing code

August 22, 2015, 12:30	A few questions about Gmsh: Background Mesh and Tutorial 7	#1
SeanQuallen New Member Sean Quallen Join Date: Dec 2011 Posts: 9 Rep Power: 15	Hello all! I'm learning how to use Gmsh by going through the tutorials they've provided. However I've come to tutorial number 7 (t7) and am now stuck at the 'background mesh'. Here are a few questions, if one of you would be so kind as to help out: First, what is a background mesh, anyway? There's no definitive answer to this that I've been able to find. It looks to be some pre-defined field that somehow gets interpolated into my mesh-space (??), but I have no real clear idea as to its concept and purpose. Second, has anyone run this tutorial 7 provided by Gmsh? It's only 3 lines and the final line sets up a background mesh view. Am I supposed to continue on with that? Is that supposed to provide a mesh for me? The program hangs when I attempt to mesh 2d so I'm assuming something has not worked. I'd appreciate any help offered to these questions! Thanks! Sean

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August 23, 2015, 15:31		#2
SeanQuallen New Member Sean Quallen Join Date: Dec 2011 Posts: 9 Rep Power: 15	Sorry all, it was user failure. The smoothing steps option had accidentally been set to a very high value. Deleting it from my .gmsh-options solved that.