Use a structured, quadrilateral mesh for the rod and the surrounding
air.
PROBLEM
TYPE
Data
-> Problem data -> 2D, Axisymmetric, Harmonic,
Click both Compute Stress and Include Losses
FREQUENCY
Data
-> Interval data (10000-30000 Hz)
To obtain the more precise frequency dependence
Repeat
Data -> Interval
data -> Use New Interval -> Copy condition's entities from interval 1 -> Yes
-> Create interval 2 -> 20000-24000 Hz -> Create interval 3 -> 15000-17000
Hz
CALCULATION
Calculate -> Calculate window -> Start