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Frequency Domain Study

Posted Oct 16, 2012, 6:51 a.m. EDT Version 4.2 4 Replies

Greta Badino
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Hi,
I'm starting to use Comsol and I'm trying to do a frequency domain study on a poroelastic material subject to a sinusoidal load which frequency is in the range 1 to 100 Hz. My problem is that I don't know how to define this periodic load, can someone please help me?
Thanks,
Greta
4 Replies Last Post Oct 20, 2012, 2:46 p.m. EDT
Andries van Wijhe
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Posted: 1 decade ago Oct 16, 2012, 7:39 a.m. EDT
I was struggling with as well with acoustics, but I concluded that if you do a frequency domain study COMSOL assumes that loads on your system are in a sinusoidal frequency.
I was struggling with as well with acoustics, but I concluded that if you do a frequency domain study COMSOL assumes that loads on your system are in a sinusoidal frequency.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 16, 2012, 10:32 a.m. EDT
Hi

the external loads / forces you apply are ALL considered as amplitudes (might be complex) of the frequency span, and the frequency is defined in the solver node, as a value or a range

This is the default way for harmonic developments, check the equation tab of the main physics nodes

--
Good luck
Ivar
Hi the external loads / forces you apply are ALL considered as amplitudes (might be complex) of the frequency span, and the frequency is defined in the solver node, as a value or a range This is the default way for harmonic developments, check the equation tab of the main physics nodes -- Good luck Ivar
Greta Badino
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Posted: 1 decade ago Oct 20, 2012, 8:44 a.m. EDT
Hi Ivar,
thanks for your help. I checked the equations of the frequency domain and, from what I understand, the frequency study considers as periodic only Fv ( a body load) while I'd like to simulate a periodic boundary load. In fact, I'm trying to simulate the effect of an indentation test on the poroelastic material. Can you please tell me how to reach this goal?
Thanks,
Greta
Hi Ivar, thanks for your help. I checked the equations of the frequency domain and, from what I understand, the frequency study considers as periodic only Fv ( a body load) while I'd like to simulate a periodic boundary load. In fact, I'm trying to simulate the effect of an indentation test on the poroelastic material. Can you please tell me how to reach this goal? Thanks, Greta
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Oct 20, 2012, 2:46 p.m. EDT
Hi

Normally all loads are "harmonic", not only body loads, also boundary loads. Check carefully, and i.e. make a simple example to get convinced

--
Good luck
Ivar
Hi Normally all loads are "harmonic", not only body loads, also boundary loads. Check carefully, and i.e. make a simple example to get convinced -- Good luck Ivar

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