Smooth out griddata results

I have a set of velocity values and coordinates exported from ANSYS Fluent (in vector form), and want to interpolate the into a grid. I have done this with a couple of other experiments, with no issues, but this time this is producing confusing results, and the contour plot doesn't give out smooth results.

A = dlmread(fileName,'', 1, 1);
xa=A(:,1);
ya=A(:,2);
u=A(:,3);
v=A(:,4);

dx = 6.25E-5;

[x,y]=meshgrid(0:dx:0.05, 0:dx:0.01);

vx  = griddata(xa,ya,u,x,y);
vy = griddata(xa,ya,v,x,y);

This produces a contourf(vx) like so:

What can I do to smooth out this interpolation?

[Naomi Krauzig]

Hello Pedro,

you can try to change the method during the gridding:

vx = griddata(xa,ya,u,x,y,'cubic');

vy = griddata(xa,ya,v,x,y,'cubic');

the interpolation method can be'linear', 'nearest', 'natural', 'cubic', or 'v4'.

The default method is 'linear' and the 'cubic' one usually smooths the results a bit but you should take a look and pick one that best suits your needs.

Hope that helps a bit,

Naomi