Mesh Generation Using gmsh to simulate cavity flow

Albert S. Kim, Assoc. Prof.CEE, UHM

Adding Points

Go to Modules Geometry Elementary entities Add Point

Numbers are arbitrary.

Coordinate input (1-4)

Coordinate input (5-8)

Adding Lines

Go to Modules Geometry Elementary entities Add Straight Line

Adding Surfaces

Go to Modules Geometry Elementary entities Add Plane Surface

Top

Press e after you select 4 lines.

Bottom

Left & Right

Front & Back

Adding Volume

Go to Modules Geometry Elementary entities Add Volume

Adding .geo file

Go to File Save As

Adding Physical Surface

Go to Modules Geometry Physical groups Add Surface

top

bottom

left & right

front & back

Adding Physical Volume

Go to Modules Geometry Physical groups Add Volume

My cu be. ge o

My cu bes ym

.ge o

Close gmsh program Restart gmsh Load

mycubesym.geo

Go to Mesh 3D

File Save Mesh

Files generated are

mycube.geo Original file generated by gmsh

mycubesym.geo Edited file from mycube.geo to include surface

names such as top, bottom, left, right, front, and back.

mycubesym.msh Mesh file from mycubesym.geo.

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