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poissons ratio of water

Posted 3 févr. 2017, 07:48 UTC−5 Acoustics & Vibrations, Materials Version 5.2, Version 5.2a 7 Replies

Dinesh Rotake
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what value, we take for poissons ratio of water, because when we select water in comsol, ask for Young's Modulus, poissons ratio.
7 Replies Last Post 4 août 2017, 01:47 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 3 févr. 2017, 09:47 UTC−5
Hello Dinesh,
It sounds like you have a solid mechanics physics interface assigned to one or more domain that is filled with water. Make sure to correct that and the software won't expect a Poisson ratio for water.
Jeff
Hello Dinesh, It sounds like you have a solid mechanics physics interface assigned to one or more domain that is filled with water. Make sure to correct that and the software won't expect a Poisson ratio for water. Jeff
Dinesh Rotake
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Posted: 8 years ago 4 févr. 2017, 02:57 UTC−5
how to change the physics, i am attaching the comsol file. please give the steps. i try to put comsol file in discussion forum but, it shows invalid file.​
how to change the physics, i am attaching the comsol file. please give the steps. i try to put comsol file in discussion forum but, it shows invalid file.​
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 13 févr. 2017, 14:20 UTC−5
You specify which domains a physics applies to in the selection list for that physics's top Model Builder node. See the Introduction to COMSOL Multiphysics manual, version 5.2a, around pages 114-120 for an example. All manuals are accessible through File>Help>Documentation.
Best,
Jeff
You specify which domains a physics applies to in the selection list for that physics's top Model Builder node. See the Introduction to COMSOL Multiphysics manual, version 5.2a, around pages 114-120 for an example. All manuals are accessible through File>Help>Documentation. Best, Jeff
Yayun Du
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Posted: 7 years ago 21 juin 2017, 00:46 UTC−4

You specify which domains a physics applies to in the selection list for that physics's top Model Builder node. See the Introduction to COMSOL Multiphysics manual, version 5.2a, around pages 114-120 for an example. All manuals are accessible through File>Help>Documentation.
Best,
Jeff

But your suggestions don't help at all. I think you should give us more practical advice or find out the reason at least!Thanks !
[QUOTE] You specify which domains a physics applies to in the selection list for that physics's top Model Builder node. See the Introduction to COMSOL Multiphysics manual, version 5.2a, around pages 114-120 for an example. All manuals are accessible through File>Help>Documentation. Best, Jeff [/QUOTE] But your suggestions don't help at all. I think you should give us more practical advice or find out the reason at least!Thanks !
Om Kar
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Posted: 7 years ago 28 juil. 2017, 20:50 UTC−4
Hello Jeff,

What if I want to use solid mechanics physics interface assigned to one or more domain that is filled with water. Then, what will be the value of Young's Modulus and Poisson's ratio?

Could we take Young's Modulus to be 2.2[GPa]?
One more thing, still I don't know the value of Poisson's ratio, could you please help me, I am trying to practice COMSOL tutorial Application ID: 417 ( Acoustic-Structure Interaction).

Thanks!
Hello Jeff, What if I want to use solid mechanics physics interface assigned to one or more domain that is filled with water. Then, what will be the value of Young's Modulus and Poisson's ratio? Could we take Young's Modulus to be 2.2[GPa]? One more thing, still I don't know the value of Poisson's ratio, could you please help me, I am trying to practice COMSOL tutorial Application ID: 417 ( Acoustic-Structure Interaction). Thanks!
Nagi Elabbasi Facebook Reality Labs
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Posted: 7 years ago 2 août 2017, 23:43 UTC−4
Updated: 7 years ago 2 août 2017, 23:44 UTC−4
You should not apply Solid Mechanics to a region that is occupied by water. To get fluid properties in solid mechanics you need a high bulk modulus (~2 GPa for water), and a shear modulus (and Young’s modulus) of zero. The model however will not be stable (mainly because the Lagrangian displacement-based solid mechanics formulation is not suitable for fluids). Instead use either a Fluid Flow Physics or an Acoustics Physics for the fluid.

Nagi Elabbasi
Veryst Engineering
You should not apply Solid Mechanics to a region that is occupied by water. To get fluid properties in solid mechanics you need a high bulk modulus (~2 GPa for water), and a shear modulus (and Young’s modulus) of zero. The model however will not be stable (mainly because the Lagrangian displacement-based solid mechanics formulation is not suitable for fluids). Instead use either a Fluid Flow Physics or an Acoustics Physics for the fluid. Nagi Elabbasi Veryst Engineering
Om Kar
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Posted: 7 years ago 4 août 2017, 01:47 UTC−4
Thank you very much for your help.
Thank you very much for your help.

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