|
[Sponsors] |
November 3, 2020, 23:34 |
Locally refining mesh over cylinder in Gmsh
|
#1 |
New Member
Deepak
Join Date: Nov 2020
Posts: 2
Rep Power: 0 |
I want to mesh a cylinder in Gmsh with a finer mesh at a particular circular location along its height. I have succeeded partially with the code below:
-------------------------------------------------------------------------------- SetFactory("OpenCASCADE"); //Create a circle Circle(1) = {0, 0, 6, 1, 0, 2*Pi}; Curve Loop(1) = {1}; Plane Surface(1) = {1}; //Extrude into a cylinder 4 units along Z-direction and 6 units along -Z direction Extrude {0, 0, 4} { Surface{1}; } Extrude {0, 0, -6} { Surface{1}; } //Convert Circle 1 into transfinite line so that a fine mesh can be obtained in its vicinity Transfinite Line{1}=100; -------------------------------------------------------------------------------------- The mesh is coming out fine (when I do a 2D or 3D mesh) except at the location where the generator of the extruded cylinder intersects the circle (here the mesh is coarse). Any ideas on how to overcome the problem and obtain a uniformly fine mesh at Circle(1)? |
|
November 5, 2020, 13:55 |
|
#2 |
Senior Member
Mikko
Join Date: Jul 2014
Location: The Hague, The Netherlands
Posts: 243
Rep Power: 13 |
At the moment, you are only defining the cell size along the line. You should also define the cell size elsewhere. For instance, define the cell sizes at the points:
Characteristic Length {1} = 0.1; Characteristic Length {2, 3} = 1; |
|
November 6, 2020, 01:02 |
|
#3 |
New Member
Deepak
Join Date: Nov 2020
Posts: 2
Rep Power: 0 |
Your solution worked Thanks a lot.
But what do points 1,2,3 correspond to? Are they the three points at which cylinder's generator-line intersects the three circles? |
|
November 6, 2020, 01:40 |
|
#4 |
Senior Member
Mikko
Join Date: Jul 2014
Location: The Hague, The Netherlands
Posts: 243
Rep Power: 13 |
You are welcome. If you visually look at the geometry, it contains only 3 points. The points are the start/end points of each circle.
|
|
Tags |
gmsh 4.5.4, mesh 2d, refine mesh |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Prescribed Translating Cylinder Mesh for Added Mass Problem (Transient FSI) | Lloyd Sullivan | CFX | 5 | August 7, 2018 08:11 |
Gambit problems | Althea | FLUENT | 22 | January 4, 2017 03:19 |
[snappyHexMesh] Layers:problem with curvature | giulio.topazio | OpenFOAM Meshing & Mesh Conversion | 10 | August 22, 2012 09:03 |
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! | sc298 | OpenFOAM Meshing & Mesh Conversion | 2 | March 27, 2011 21:11 |
Convergence moving mesh | lr103476 | OpenFOAM Running, Solving & CFD | 30 | November 19, 2007 14:09 |