Discussion Forum

Dear everyone,
I am looking for a very accurate method to compute an interpolation from data obtained via another software.
We have solved an external acoustic problem using BEM, and data are listed as :

x y z freq real(p) imag(p)


The method seems to interpolate these data (4D interpolation), and this interpolation will be applied on geometrical entities (external boundaries). Then COMSOL would evaluate coordinates (nodes coordinates?) and frequency, and then attributes values at nodes, according to loads and constraints applied on the geometrical entities. (An additional mesh must surround, the geometrical entities studies)

so the method is :
data on BEM mesh =====> Interpolation 4D (x,y,z,freq) ======> data on COMSOL mesh


Talking with support COMSOL, the only way is to use MATLAB LiveLink. I am trying this, but it becomes complicated.

I am sure some of COMSOL users are already doing this.

What is the best method ? Is there any MATLAB function available ?


Mine is still in 3D, and I am trying to compare it with the COMSOL 3D interpolation, and is based on the Delaunay triangulation :

function out = pblocked(x,y,z)
filename = 'cube_face.txt' % file containing DATA
DATA = dlmread(filename)
X = DATA(:,1); Y = DATA(:,2); Z = DATA(:,3); P = DATA(:,4); COORDINATES = [X Y Z] ;
F = TriScatteredInterp(COORDINATES,P) ; % Function generated by MATLAB (use r2009 or later)
F_value = F(x,y,z);
out = F_value % interpolation


Regards,
SB