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Open end acoustic radiation problems: radiation impedance at the opening

Posted Apr 27, 2015, 3:20 a.m. EDT Version 5.0 0 Replies

Jianliang Wang
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I using the model www.comsol.com/model/open-pipe-1365, in this example, where the z0 is calculate by comsol, the zL is calculate from analytical method.
I just focus on the PML part which is the fisrt part of the demo, then I define a zL= p_L/ v_L just like the z0 at the opening, then compare this calculated value with the analytical zL_ana, the imagine part have little difference, however the real part have a const difference about equal 50, could any body can give some tips on this difference.
the zL from comsol variable definition is
vzl=intop_L(2*r*acpr.vz/a^2)
pl=intop_L(2*r*p/a^2)
zl=pl/vzl

intop_L is a integration at L
i.imgur.com/UOXOyx5.png
0 Replies Last Post Apr 27, 2015, 3:20 a.m. EDT
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