How can I refine a portion of my mesh?

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I have a 2-D grid that needs to be very fine to capture the physics. The problem with using meshgrid or ndgrid is that it plots points outside of my boundary. In order to have a grid that is fine enough, the code either takes several hours to run or the computer runs out of memory. I have identified what points are outside of my geometry in the form of a mxn logical (1's for any point in the boundary, 0's for any point outside of the boundary). I am trying to refine my mesh with the geometry after finding the boundaries. The final mesh will be a non-uniform mesh with 'NaN' at points outside of the geometry and a small grid spacing in x and y-directions. Ideally, the grid would be very fine near the upper and lower walls (y-direction) and widen in the middle, and decrease in grid spacing in the x-direction as the x increases.
Any thoughts on how I can refine an existing grid at specified locations?

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Accepted Answer

Star Strider
Star Strider on 30 Sep 2019
The arguments to ndgrid (or meshgrid) do not need to be uniform, they can be anything that makes sense to those functions.
Example —
x = -3:0.1:3;
v = exp(-x.^2/3);
[X,Y] = ndgrid(v);
plot(X, Y)
Experiment to get the result you want.

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