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Rotation, Rheological model
Posted May 19, 2011, 11:56 a.m. EDT 1 Reply
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I am trying to simulate fluid flow in a pipe but I have two problems. I appreciate if anybody give me some hint:
1. I just see three rheological models available in COMSOL: Newtonian, Carreau, and Power law. So how is it possible to simulate another rheological models such as Herschel_ Bulkley, etc?
2. I dont see an option in COMSOL( although it is in the help) to simulation rotation of a pipe. In the options for wall boundary conditions, there is no such capability.
Thanks,
1. I just see three rheological models available in COMSOL: Newtonian, Carreau, and Power law. So how is it possible to simulate another rheological models such as Herschel_ Bulkley, etc?
2. I dont see an option in COMSOL( although it is in the help) to simulation rotation of a pipe. In the options for wall boundary conditions, there is no such capability.
Thanks,
1 Reply Last Post May 25, 2011, 8:02 a.m. EDT
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Posted:
1 decade ago
Hi,
Herschel_ Bulkley is a rheological model with a yield stress. Below the yield stress the material behaves like a solid and above the yield stress the material behaves like a fluid. So you have a stress dependent phase transsition and the solid state (the relation between stress and strain) is not defined in Herschel_ Bulkley.
I guess, you have to build a workaround.
For modeling of rotating walls see the tutorial "dense suspension".
greetings
Uwe
Herschel_ Bulkley is a rheological model with a yield stress. Below the yield stress the material behaves like a solid and above the yield stress the material behaves like a fluid. So you have a stress dependent phase transsition and the solid state (the relation between stress and strain) is not defined in Herschel_ Bulkley.
I guess, you have to build a workaround.
For modeling of rotating walls see the tutorial "dense suspension".
greetings
Uwe