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{ 3D_MESH_EXPORT.PDE

 

 This example shows the use of the TRANSFER command to export problem data

 and mesh structure in 3D problems.

 

 The accompanying test 3D_MESH_IMPORT.PDE reads the transfer file produced here.

 

 (The framework of the problem is a version of 3D_ANTIPERIODIC.PDE.)

 

}  

 

title '3D MESH TRANSFER TEST'  

 

coordinates cartesian3  

 

variables  

   u  

 

definitions  

   k = 1  

   an = pi/4         { this is the angular size of the repeated segment }  

   crot = cos(an)     { the sine and cosine needed in the transformation }  

   srot = sin(an)  

   H = 0  

   xc = 1.5  

   yc = 0.2  

   rc = 0.1  

 

equations  

   U: div(K*grad(u)) + H = 0  

 

extrusion z=0,0.4,0.6,1  

 

boundaries  

  Region 1  

 

      start(1,0) line to (2,0)  

 

      value(u) = 0 arc(center=0,0) to (2*crot,2*srot)  

 

      antiperiodic(x*crot+y*srot, -x*srot+y*crot)  

      line to (crot,srot)  

 

      value(u)=0  

      arc(center= 0,0) to close  

 

  Limited Region 2  

      layer 2 H=1  

      start(xc-rc,0) line to (xc+rc,0) to (xc+rc,rc) to (xc-rc,rc) to close  

 

  Limited Region 3  

      layer 2 H=-1  

      start((xc-rc)*crot,(xc-rc)*srot)  

      line to ((xc+rc)*crot,(xc+rc)*srot)  

            to ((xc+rc)*crot+rc*srot,(xc+rc)*srot-rc*crot)  

            to ((xc-rc)*crot+rc*srot,(xc-rc)*srot-rc*crot) to close  

 

plots  

    contour(u) on z=0.5 paint  

    grid(x,y,z)  

 

    transfer(u) file="mesh3u.xfr" ! Export mesh and data

    transfer()   file="mesh3.xfr" ! Export mesh only

 

end