[Lewis Liang]

Currently, I build up a horizontal cylinder with the STL file as shown in the attached figure. The cylinder is placed in the XY plane and perpendicular to X- axis. Then, I try to rotate the cylinder to a position (90 degree) which is same as the red line with its central point A. I have tried to type these codes from some online tutorial about the surfaceTransformPoints command:

export FILE="cylinder_v2.stl"
#surfaceTransformPoints -yawPitchRoll "(0 90 0)" cylinder.stl $FILE
#surfaceTransformPoints -rollPitchYaw "(0 90 0)" cylinder.stl $FILE
#surfaceTransformPoints -rotate '( (1 0 0) (0 0 1) )' cylinder.stl $FILE
#surfaceTransformPoints -scale '(1 1 -1)' cylinder.stl $FILE

However, the new STL file is not what I expect after checking in the paraview. Could anyone please give me some tips to deal with this problem?

Thanks in advance!

Zuodong

[olesen]

Originally Posted by Lewis Liang

Currently, I build up a horizontal cylinder with the STL file as shown in the attached figure. The cylinder is placed in the XY plane and perpendicular to X- axis.

This problem may now be easier to solve. In OpenFOAM-1712 the surfaceTransformPoints and transformPoints now have some additional options.

• The -rotate-angle option allows convenient specification of a rotation about an arbitrary axis. Eg, -rotate-angle '((1 1 1) 45)'
• The -origin option can be used to temporarily shift the origin for the rotation operations. Eg, mirroring -origin '(0 0 1)' -rotate-angle '((1 0 0) 180)

You should also note that you can also use a scalar for uniform scaling factors.
Eg '-scale 0.001' instead of -scale '(0.001 0.001 0.001)' for less typing and fewer mistakes.

[Lewis Liang]

Originally Posted by olesen

This problem may now be easier to solve. In OpenFOAM-1712 the surfaceTransformPoints and transformPoints now have some additional options.

• The -rotate-angle option allows convenient specification of a rotation about an arbitrary axis. Eg, -rotate-angle '((1 1 1) 45)'
• The -origin option can be used to temporarily shift the origin for the rotation operations. Eg, mirroring -origin '(0 0 1)' -rotate-angle '((1 0 0) 180)

You should also note that you can also use a scalar for uniform scaling factors.
Eg '-scale 0.001' instead of -scale '(0.001 0.001 0.001)' for less typing and fewer mistakes.

Hi! @olesen! Thanks for your advice! I will try it later.
Cheers!
Zuodong