/usr/share/doc/freefem++/examples/examples++-3d/EqPoisson.edp is in freefem++-doc 3.19.1-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | load "msh3" load "medit"
func f=2*((0.1+(((x/3))*(x-1)*(x-1)/1+x/100))^(1/3.)-(0.1)^(1/3.));
real yf=f(1.2,0);
border up(t=1.2,0.){ x=t;y=f;label=0;}
border axe2(t=0.2,1.15) { x=t;y=0;label=0;}
border hole(t=pi,0) { x= 0.15 + 0.05*cos(t);y= 0.05*sin(t); label=1;}
border axe1(t=0,0.1) { x=t;y=0;label=0;}
border queue(t=0,1) { x= 1.15 + 0.05*t; y = yf*t; label =0;}
int np= 100;
func bord= up(np)+axe1(np/10)+hole(np/10)+axe2(8*np/10)+ queue(np/10);
plot( bord);
mesh Th2=buildmesh(bord);
plot(Th2,wait=1);
int[int] l23=[0,0,1,1];
mesh3 Th=buildlayers(Th2,coef= max(.15,y/max(f,0.05)), 50 ,zbound=[0,2*pi]
,transfo=[x,y*cos(z),y*sin(z)],facemerge=1,labelmid=l23);
macro Grad(u) [dx(u),dy(u),dz(u)] //
fespace Vh(Th,P1); Vh u,v;
solve Poisson(u,v) = int3d(Th)( Grad(u)'*Grad(v) ) - int3d(Th)( v) + on(1,u=1);
plot(u,wait=1,nbiso=20,value=1);
medit("u",Th,u,wait=1);
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