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Magnetic-Fluid Interaction
Posted 24 mar 2010, 05:31 GMT-4 2 Replies
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Hi everybody,
in order to simulate the behavior of a magnetorheological fluid i have created a steady flow in a 2D-tube that runs in vertical direction. At the middle of the tube i have permanent magnets on both sides of the tube. So far so easy, i had no problems generating the magnetic field but now i would like to connect the dynamic viscosity with the strength of the magnetic field. Actually, i don´t know which kind of model i´m supposed to use for this problem. Because in the Fluiddynamics i can only choose the navier-stoke-equation which is based on a newton fluid but mine should more or less behave like a Herschl-Bulkley or Casson-Fluid. In the navier-stoke model the viscosity is the same in the whole tube and in mine it should be different in every single point according to the magnetic field.
Can anybody tell me how to do this in comsol or do i need an additional modul to create such a model?
Any ideas, comments, corrections are very appreciated.
in order to simulate the behavior of a magnetorheological fluid i have created a steady flow in a 2D-tube that runs in vertical direction. At the middle of the tube i have permanent magnets on both sides of the tube. So far so easy, i had no problems generating the magnetic field but now i would like to connect the dynamic viscosity with the strength of the magnetic field. Actually, i don´t know which kind of model i´m supposed to use for this problem. Because in the Fluiddynamics i can only choose the navier-stoke-equation which is based on a newton fluid but mine should more or less behave like a Herschl-Bulkley or Casson-Fluid. In the navier-stoke model the viscosity is the same in the whole tube and in mine it should be different in every single point according to the magnetic field.
Can anybody tell me how to do this in comsol or do i need an additional modul to create such a model?
Any ideas, comments, corrections are very appreciated.
2 Replies Last Post 20 apr 2010, 09:53 GMT-4
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Posted:
1 decade ago
I think that within3.5a you need to use the pde mode to write your own model and couple it with navier stoke.
it is possible to have viscosity as a function of space and time [ I know i have done that but as an externally defined function].
the good news is that it is possible .
have fun
jf
it is possible to have viscosity as a function of space and time [ I know i have done that but as an externally defined function].
the good news is that it is possible .
have fun
jf
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Posted:
1 decade ago
I can be not right, however I have following thoughts
Local action of a magnetic field on a magnetic liquid can is an equivalent of viscosity arising under the influence of a magnetic field.
Local action of a magnetic field on a magnetic liquid can is an equivalent of viscosity arising under the influence of a magnetic field.