Hello Tomas.
I noticed something wrong in your ff3d file:
double eps = 1000;
function P = eps*one(<1,0,0>)+1
// ... then ...
double fx = int[M](ki/eps*u);
double fy = int[M](ki/eps*v);
double fz = int[M](ki/eps*w);
The problem is that in my mind, eps is something small and P is defined using
1/eps so the force here is not evaluated correctly. I suggest:
double eps = 1E-4;
function P = 1/eps*one(<1,0,0>)+1
// ... then keep ...
double fx = int[M](ki/eps*u);
double fy = int[M](ki/eps*v);
double fz = int[M](ki/eps*w);
I have run you example for a few iterations, and I get for instance
<#i=8
<#Fx=-0.378171
<#Fy=2.7602e-05
<#Fz=-0.0644279
Is it more what you expect?
Best regards,
Stéphane.
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