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plane acoustic wave in solid
Posted 25 mar 2010, 05:30 GMT-4 2 Replies
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Hello,
I want to simulate a simple plane acoustic wave traveling through a solid. Therefor I implement a pressure source on a surface boundary as Radiation Condition. I suppose that the wave uses the speed of sound of the subdomain. But in the result the pressure is everywhere from the beginning on. No traveling wave can be seen. I considered the solver time steps in the range of the speed of sound.The wave direction vector should also be right.
Does anybody have an idea where my fault is?
Thanks a lot!
C.Mannal
I want to simulate a simple plane acoustic wave traveling through a solid. Therefor I implement a pressure source on a surface boundary as Radiation Condition. I suppose that the wave uses the speed of sound of the subdomain. But in the result the pressure is everywhere from the beginning on. No traveling wave can be seen. I considered the solver time steps in the range of the speed of sound.The wave direction vector should also be right.
Does anybody have an idea where my fault is?
Thanks a lot!
C.Mannal
2 Replies Last Post 4 ott 2013, 09:55 GMT-4
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Posted:
1 decade ago
acoustic wave dont exist in solid they are called elastic waves and are of different kinds [ p wave s wave.. and so forth the problem is MUCH more complicated than in gas or liquid.
if yu know in advance, as it happen sometime, that only one kind of wave exist [ p waves most commonly] you can write a simplified pde that handle only this kind of wave. I dngt have acoustic module so I cannot say whether or not this module can handle that but you need to know what you are doing if you go that route.
To the best of my knowledge [ but i can be wrong on that so it is worth double checking], comsol does not handle elastic wave at the moment.
th
jf
if yu know in advance, as it happen sometime, that only one kind of wave exist [ p waves most commonly] you can write a simplified pde that handle only this kind of wave. I dngt have acoustic module so I cannot say whether or not this module can handle that but you need to know what you are doing if you go that route.
To the best of my knowledge [ but i can be wrong on that so it is worth double checking], comsol does not handle elastic wave at the moment.
th
jf
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Posted:
1 decade ago
COMSOL does have the capability to model elastic waves. There are several good examples online:
www.comsol.com/model/saw-gas-sensor-2129
www.comsol.com/model/acoustic-transmission-loss-through-periodic-elastic-structures-1974
www.comsol.com/model/acoustic-structure-interaction-417
www.comsol.com/model/wave-propagation-in-rock-under-blast-loads-12811
www.comsol.com/model/saw-gas-sensor-2129
www.comsol.com/model/acoustic-transmission-loss-through-periodic-elastic-structures-1974
www.comsol.com/model/acoustic-structure-interaction-417
www.comsol.com/model/wave-propagation-in-rock-under-blast-loads-12811