Use of 3d mesh adaptation
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Initial mesh | final mesh |
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cut | solid cut |
download example: Laplace-Adapt-3d.edp or return to 3D examples
load "msh3" load "tetgen" load "mshmet" load "medit" //build initial mesh int nn = 6; int[int] l1111=[1,1,1,1],l01=[0,1],l11=[1,1];// label numbering mesh3 Th3=buildlayers(square(nn,nn,region=0,label=l1111), nn, zbound=[0,1], labelmid=l11, labelup = l01, labeldown = l01); Th3 = trunc(Th3,(x<0.5) | (y < 0.5) | (z < 0.5) ,label=1);// remove the $]0.5,1[^3 cube$ //end of build initial mesh fespace Vh(Th3,P1); Vh u,v,usol,h; macro Grad(u) [dx(u),dy(u),dz(u)] // EOM problem Poisson(u,v,solver=CG) = int3d(Th3)( Grad(u)'*Grad(v) ) // ') for emacs -int3d(Th3)( 1*v ) + on(1,u=0); real errm=1e-2;// level of error for(int ii=0; ii<5; ii++) { Poisson; cout <<" u min, max = " << u[].min << " "<< u[].max << endl; h=0. ;// for resizing h h[]=mshmet(Th3,u,normalization=1,aniso=0,nbregul=1,hmin=1e-3,hmax=0.3,err=errm);//loptions=MSHloptions,doptions=MSHdoptions); cout <<" h min, max = " << h[].min << " "<< h[].max << " " << h[].n << " " << Th3.nv << endl; plot(u,wait=1); errm*= 0.8;// change the level of error cout << " Th3" << Th3.nv < " " << Th3.nt << endl; Th3=tetgreconstruction(Th3,switch="raAQ",sizeofvolume=h*h*h/6.); medit("U-adap-iso-"+ii,Th3,u,wait=1); }