Thermal conduction probelm for Cycndrical component
Answers
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Are you looking for orthogonal conductivity - or cylindrical? (If the solid is thin in the 'theta' direction, it probably doesn't matter, but if thick, then it would make a difference.)
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On behalf of Mintu i am posting question in detail, please find the attachment
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acupro_21778 said:
Are you looking for orthogonal conductivity - or cylindrical? (If the solid is thin in the 'theta' direction, it probably doesn't matter, but if thick, then it would make a difference.)
Hi thanks for the reply,
I am actually looking for specifying material properties in cylindrical coordinate system, Solid is thick cylinder.
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kpk said:
On behalf of Mintu i am posting question in detail, please find the attachment
Case 1 - This appears to be still a repeating rectangular cross-section, not cylindrical, and that you're still needing orthogonal conductivity - but at an angle rather than aligned with X/Y/Z. Would you agree? If you simplify this to a single solid cylinder (annulus), or several cylindrical sections, then a cylindrical description would be appropriate.
Case 2 - This is not something that would be supported by default, but 'may' be possible with a user function. That would be quite complex and would likely require some paid services work, if it's even possible. You should probably contact your Altair Account Manager to discuss that.
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kpk said:
On behalf of Mintu i am posting question in detail, please find the attachment
With the individual elements (in the simplified case) being quite thin, it's probably simpler to use the cylindrical approach, since it would be the same for all of the sections. Otherwise, with orthogonal, the angle would need to be determined for each section individually.
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Turns out the 2020.1 release of AcuSolve includes a cylindrical definition for anisotropic conductivity. Example input file command:
CONDUCTIVITY_MODEL ( "cylindrical" ) {
type = cylindrical_anisotropic
cylindrical_center = { 0.0, 0.0, 0.0; } # A point on the cylindrical axis - preferably at the center
cylindrical_axis = { 0.707, 0.0, 0.707; } # Unit vector defining the cylindrical axis direction
anisotropic_conductivity = { 1.0, 50.0, 50.0, 0.0, 0.0, 0.0; } # { Krr, Ktt, Kzz, Krt, Ktz, Krz; }
# First three values are R, Theta, Z conductivity
}This could then be applied to all of the segments for Case 1. Again, there will be some small error since the segments aren't really cylindrical/annular, but that error should be small when the segments are thin.
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acupro_21778 said:
Turns out the 2020.1 release of AcuSolve includes a cylindrical definition for anisotropic conductivity. Example input file command:
CONDUCTIVITY_MODEL ( "cylindrical" ) {
type = cylindrical_anisotropic
cylindrical_center = { 0.0, 0.0, 0.0; } # A point on the cylindrical axis - preferably at the center
cylindrical_axis = { 0.707, 0.0, 0.707; } # Unit vector defining the cylindrical axis direction
anisotropic_conductivity = { 1.0, 50.0, 50.0, 0.0, 0.0, 0.0; } # { Krr, Ktt, Kzz, Krt, Ktz, Krz; }
# First three values are R, Theta, Z conductivity
}This could then be applied to all of the segments for Case 1. Again, there will be some small error since the segments aren't really cylindrical/annular, but that error should be small when the segments are thin.
Hi thanks for reply i will try to check in latest version
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acupro_21778 said:
Case 1 - This appears to be still a repeating rectangular cross-section, not cylindrical, and that you're still needing orthogonal conductivity - but at an angle rather than aligned with X/Y/Z. Would you agree? If you simplify this to a single solid cylinder (annulus), or several cylindrical sections, then a cylindrical description would be appropriate.
Case 2 - This is not something that would be supported by default, but 'may' be possible with a user function. That would be quite complex and would likely require some paid services work, if it's even possible. You should probably contact your Altair Account Manager to discuss that.
This appears to be still a repeating rectangular cross-section, not cylindrical, and that you're still needing orthogonal conductivity - but at an angle rather than aligned with X/Y/Z. Would you agree?
Agreed. If the properties are varying wrt angle, then, can we specify, say, using options like constant anisotropic ?
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acupro_21778 said:
Turns out the 2020.1 release of AcuSolve includes a cylindrical definition for anisotropic conductivity. Example input file command:
CONDUCTIVITY_MODEL ( "cylindrical" ) {
type = cylindrical_anisotropic
cylindrical_center = { 0.0, 0.0, 0.0; } # A point on the cylindrical axis - preferably at the center
cylindrical_axis = { 0.707, 0.0, 0.707; } # Unit vector defining the cylindrical axis direction
anisotropic_conductivity = { 1.0, 50.0, 50.0, 0.0, 0.0, 0.0; } # { Krr, Ktt, Kzz, Krt, Ktz, Krz; }
# First three values are R, Theta, Z conductivity
}This could then be applied to all of the segments for Case 1. Again, there will be some small error since the segments aren't really cylindrical/annular, but that error should be small when the segments are thin.
Hi
I couldn't find cylindrical_anisotropic in below link, can you share any link if you have
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kpk said:
Hi
I couldn't find cylindrical_anisotropic in below link, can you share any link if you have
You are correct. The documentation for cylindrical conductivity is not yet included in the Command Reference Manual - for 2021. Maybe later in the 2021.1 release.
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