Generating a parabolic profile in gmsh
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Hello,
I am trying to generate a parabolic profile (on the xy plane to be extruded along the zdirection) of a tank, to model the flow of fluid inside the tank with bubbleFoam. My issue is I have tried many ways to get such a geometry into openfoam. My first try was to import an igs file with the geometry into gmsh, netgen or salome however none of these seemed to work.. I decided to generate the mesh from scratch, so I wrote a script to generate points along a parabola and join them all with straight lines (see attached image). Then I try to generate a 2d surface mesh and I get the following error: "Error : Identical points in triangulation: increase element size or Mesh.RandomFactor" and gmsh crashes. How do I specify element size in gmsh? And what is Mesh.RandomFactor? Cheers 
From Gmsh documentation:
Mesh.RandomFactor Random factor used in the 2D meshing algorithm (should be increased if RandomFactor * size(triangle)/size(model) approaches machine accuracy) Default value: 1e09 When generating mesh, position of every point is perturbated by small random value to avoid 3 aligned points. So for beginning you can set Mesh.RandomFactor=1e7 (or something like that) in your .geo file and try again. 
angle of element in gmsh
I want to change the angle of triangle element

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