- #1
sisquet
- 4
- 0
Hi!
I'm doing my master thesis about designing a offshore wind turbine tower for subarctic conditions and I have a major problem with units
I'm not much familiarised with Ansys, so I use Ansa as preprocessor and launch the solve in Ansys
The problem I have is in units. I'm using Ansys SI units but tweaked
Long. cm
Mass. Kp
Time. s
and therefore all units combinig those
P Kp/cm^2
dens Kp/cm^3
Force kp/cm·s^-2
the problem is that, my supervisor keeps on saying that for density and MASS21 elements i should use t/cm^3 and t and I don't like the reasons he has given me about it. Furthermore when i run a Block lanzos nodal calculation my first mode is around 0.3E-1 which is far away from expected result of 0.3Hz.
So when i run with density 7.85E-3 i and i tell ansys so extract 4 first modes i got in comand window like, not kidding, +400 solutions and this before cancelling the calculation after 20min when with the other density doesn't take more than 1 min to find results
Im kind of stuck, cause if the nodal is not correct it makes no sense that i waste time trying to optimise an estatic and dynamic model
Please any Ansys guru could help? thanks a million
I'm doing my master thesis about designing a offshore wind turbine tower for subarctic conditions and I have a major problem with units
I'm not much familiarised with Ansys, so I use Ansa as preprocessor and launch the solve in Ansys
The problem I have is in units. I'm using Ansys SI units but tweaked
Long. cm
Mass. Kp
Time. s
and therefore all units combinig those
P Kp/cm^2
dens Kp/cm^3
Force kp/cm·s^-2
the problem is that, my supervisor keeps on saying that for density and MASS21 elements i should use t/cm^3 and t and I don't like the reasons he has given me about it. Furthermore when i run a Block lanzos nodal calculation my first mode is around 0.3E-1 which is far away from expected result of 0.3Hz.
So when i run with density 7.85E-3 i and i tell ansys so extract 4 first modes i got in comand window like, not kidding, +400 solutions and this before cancelling the calculation after 20min when with the other density doesn't take more than 1 min to find results
Im kind of stuck, cause if the nodal is not correct it makes no sense that i waste time trying to optimise an estatic and dynamic model
Please any Ansys guru could help? thanks a million