[Gmsh] Interpolating mesh values

[Christophe Geuzaine]

> On 27 Nov 2017, at 23:41, Mayank Jog <mayankjog at gmail.com> wrote:
> 
> Hello,
> I've started using gmsh recently, and I wonder if there is a functionality to interpolate data. 
> 
> I have a mesh, and a value associated with each element of the mesh (electric potential)*. 
> I want to use this mesh to calculate the value of the electric potential on a uniform cartesian grid specified by points (= (x, y, z) ; known in millimeters; = same unit as in $nodes) 

Plugin(Probe) for a single evaluation; or Plugin(CutGrid) and Plugin(CutBox) for multiple evaluations on regular grids.

For example:

Merge "data.msh";
Plugin(Probe).X = 0.3;
Plugin(Probe).Y = 0.3;
Plugin(Probe).Z = 0.3;
Plugin(Probe).Run;


> 
> I'm guessing some sort of interpolation is needed...how would I go about it? 
> 
> I tried using MATLAB functions to interpolate, but they all use triangulation techniques which work for convex volumes. My volume is non-convex (it has a U-shape)...how would I do the interpolation? Does gmsh have a function to interpolate? 
> 
> Thank you,
> Mayank
> 
> *I have the  original mesh (containing $nodes, $elements, and $elementdata) in .msh format.
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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