/usr/share/doc/freefem++/examples/examples++-3d/Lac.edp is in freefem++-doc 3.19.1-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | load "msh3"
load "medit"
int nn=10;
border cc(t=0,2*pi){x=cos(t);y=sin(t);label=1;}
mesh Th2= buildmesh(cc(100));
fespace Vh2(Th2,P2);
Vh2 ux,uz,p2;
int[int] rup=[0,2], rdown=[0,1], rmid=[1,1,2,1,3,1,4,1];
func zmin= 2-sqrt(4-(x*x+y*y));
func zmax= 2-sqrt(3.);
mesh3 Th=buildlayers(Th2,nn,
coef= max( (zmax-zmin)/zmax, 1./(nn*2) ),
zbound=[zmin,zmax],
labelmid=rmid,
reffaceup = rup,
reffacelow = rdown);
medit("Lac",Th,wait=1);
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