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<P><FONT SIZE=2 FACE="Arial">Hello:</FONT>
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<P><FONT SIZE=2 FACE="Arial">I was hoping that someone could please explain the best way to stack extruded surfaces.</FONT>
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<P><FONT SIZE=2 FACE="Arial">Consider the simple example of a smaller rectangular block stacked ontop of a larger</FONT>
<BR><FONT SIZE=2 FACE="Arial">rectangular block.</FONT>
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<P><FONT SIZE=2 FACE="Arial">To build it I can simply draw the footprint of the larger block and extrude it vertically.</FONT>
<BR><FONT SIZE=2 FACE="Arial">I can then draw the second (smaller block) and extrude it vertically. Although the</FONT>
<BR><FONT SIZE=2 FACE="Arial">.pro files do not show it the intent in the future is for the blocks to be dissimilar materials</FONT>
<BR><FONT SIZE=2 FACE="Arial">and the design far more complex whick will make extruding the complex shape from the base</FONT>
<BR><FONT SIZE=2 FACE="Arial">very difficult.</FONT>
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<P><FONT SIZE=2 FACE="Arial">THis simple test case draws correctly as seen in GMSH. However when I solve it using GETDP</FONT>
<BR><FONT SIZE=2 FACE="Arial">I find that the two blocks are not seen to be connected.</FONT>
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<P><FONT SIZE=2 FACE="Arial">I do not find this surprising but I can not figure the correct way to fuse the two surfaces.<FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<cube1.pro>> </FONT><FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<thermal.pro>> </FONT></FONT></P>
<P><FONT SIZE=2 FACE="Arial">Interestingly I have (on a non-repeatable basis) had success if the extrusion are directed</FONT>
<BR><FONT SIZE=2 FACE="Arial">toward each other.</FONT>
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<P><FONT SIZE=2 FACE="Arial">I have attached the .pro files for information but I suspect that the problem is my incorrect</FONT>
<BR><FONT SIZE=2 FACE="Arial">specification in the .GEO.</FONT>
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<P><FONT SIZE=2 FACE="Arial">The geo File is:</FONT>
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<P><FONT SIZE=2 FACE="Arial">Point(1) = {-0.002, 0.00, 0.000, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(2) = {0.0, 0.002, 0.000, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(3) = {0.002, 0.00, 0.000, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(4) = {0.0, -0.002, 0.000, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(9) = {-0.001, 0.00, 0.004, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(10) = {0.0, 0.001, 0.004, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(11) = {0.001, 0.00, 0.004, 0.0005};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Point(12) = {0.0, -0.001, 0.004, 0.0005};</FONT>
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<P><FONT SIZE=2 FACE="Arial">Line(1) = {1,2};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(2) = {2,3};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(3) = {3,4};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(4) = {4,1};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line Loop(13) = {1,2,3,4};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(19) = {9,10};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(20) = {10,11};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(21) = {11,12};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line(22) = {12,9};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Line Loop(23) = {19,20,21,22};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Plane Surface(30) = {13};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Plane Surface(36) = {23};</FONT>
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<P><FONT SIZE=2 FACE="Arial">Extrude {0,0,0.004} {Surface{30}; Recombine; Layers{{10},{2000},{1}};}</FONT>
<BR><FONT SIZE=2 FACE="Arial">Extrude {0,0,0.004} {Surface{36}; Recombine; Layers{{10},{2001},{1}};}</FONT>
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<P><FONT SIZE=2 FACE="Arial">//Physical Line used to add Convection Boundary Condition</FONT>
<BR><FONT SIZE=2 FACE="Arial">Physical Surface(1000) = {30};</FONT>
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<P><FONT SIZE=2 FACE="Arial">//Physical Line used to Add Flux Boundary Condition</FONT>
<BR><FONT SIZE=2 FACE="Arial">Physical Surface(1001) = {80};</FONT>
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<P><FONT SIZE=2 FACE="Arial">//Physical Surface used to represent the Bar</FONT>
<BR><FONT SIZE=2 FACE="Arial">Physical Volume(100) = {2000};</FONT>
<BR><FONT SIZE=2 FACE="Arial">Physical Volume(101) = {2001};</FONT>
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<P><FONT SIZE=2 FACE="Arial">Thankyou</FONT>
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<P><FONT SIZE=2 FACE="Arial">Laird Bolt</FONT>
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