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-   -   [ICEM] Create part in region ... defined in cylindrical coordinates (https://www.cfd-online.com/Forums/ansys-meshing/73013-create-part-region-defined-cylindrical-coordinates.html)

 zboud February 24, 2010 09:20

Create part in region ... defined in cylindrical coordinates

Hi all,

I'd like to create a part in a region defined in cylindrical coordinates, let's say:
Min R = 0
Min theta = 0
Min z = 0
Max R = 360
Max theta = 2*pi
Max z = 200

Is it possible to define such a part in ICEM, and if so, how can I do it?

Thanks.

 rikio February 24, 2010 09:34

You can create a cylindrical geometry as you defined. But do you mean to generate a cylinder?

 zboud February 24, 2010 09:49

Sorry I was not precise enough.

My mesh is already defined, my geometry is created. What I want is to define a region of the mesh(using cylindrical coordinates), put all the elements from that region in a part, so I can use it to define boundary conditions in CFX.

I might have found something though: a loop in my script scanning the concerned cylindrical region and adding the elements to a subset which could be used to create a part. But that's quite heavy for such an easy concept!

 rikio February 24, 2010 10:05

Have you tried to create a cylindrical coordinate in CFX, and set the BC?
Maybe I misunderstood your idea: meshes on cylindrical surface would be in the surface part, no need to select manually, or by loop script.

 zboud February 24, 2010 10:15

I need a mesh region to define the BC in CFX...

The thing is I have many surfaces, so I can't just select the surface meshes.

And the other thing is that everything has to be automatic in a script, because many similar geometries will be tested.

But the selection script should be quite simple once the bounding boxes are defined.

EDIT: here's the script I wrote in case anyone is interested.

for {set i 0} {\$i<\$nblayers} {incr i} {\
mess "Ajout de la zone \$i...";\
set alpha [expr {\$layerangle*2.0*\$pi/360.0}];\
set xmin [expr {-(\$R*(1.0-cos((\$i+1.0)*\$alpha)))-0.5*\$firstR*cos(\$i*\$alpha)}];\
set ymin [expr {\$R*sin(\$i*\$alpha)-0.5*\$firstR*sin((\$i+1.0)*\$alpha)}];\
set xmax [expr {-(\$R*(1.0-cos(\$i*\$alpha)))+0.5*\$firstR*cos(\$i*\$alpha)}];\
set ymax [expr {\$R*sin((\$i+1.0)*\$alpha)+0.5*\$firstR*sin((\$i+1.0)* \$alpha)}];\
set zmax [expr {\$L*1.5}];\
mess "xmin: \$xmin\n";\
mess "xmax: \$xmax\n";\
mess "ymin: \$ymin\n";\
mess "ymax: \$ymax\n";\
mess "zmax: \$zmax\n";\