Henrik Sönnerlind
COMSOL Employee
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Posted:
7 months ago
2024年1月9日 GMT-5 09:10
The viscosity in the viscoelastic Maxwell material is isotropic. A dependency on the shear rate tensor could, in general, cause an anisotropic viscosity tensor. But even if you would just use some kind of scalar norm of the shear rate, the implementation of the viscoelastic material is not suited for a non-constant viscosity.
As for the fractional viscoelastic models, the problem with fractional derivatives in time domain is that they mathematically correspond to a convolution integral over the whole local history. This is not easily implemented. We will however investigate approximate methods, so it may become possible to remove this limitation in future releases.
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Henrik Sönnerlind
COMSOL
The viscosity in the viscoelastic Maxwell material is isotropic. A dependency on the shear rate tensor could, in general, cause an anisotropic viscosity tensor. But even if you would just use some kind of scalar norm of the shear rate, the implementation of the viscoelastic material is not suited for a non-constant viscosity.
As for the fractional viscoelastic models, the problem with fractional derivatives in time domain is that they mathematically correspond to a convolution integral over the whole local history. This is not easily implemented. We will however investigate approximate methods, so it may become possible to remove this limitation in future releases.
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Posted:
7 months ago
2024年1月11日 GMT-5 06:44
Thank you for your response. I would like to explain my issue. I wanted to model the viscoelastic behavior of a ceramic paste.
The targeted application is in the video below (08:03 mins).
Link: https://www.comsol.com/video/modeling-non-newtonian-fluids-with-the-polymer-flow-module.
Do you think it is possible to do this on COMSOL? If so, which modules should us buy? We have only access to the Solid Mechanics and Heat Transfer modules.
thank you !
Thank you for your response. I would like to explain my issue. I wanted to model the viscoelastic behavior of a ceramic paste.
The targeted application is in the video below (08:03 mins).
Link: https://www.comsol.com/video/modeling-non-newtonian-fluids-with-the-polymer-flow-module.
Do you think it is possible to do this on COMSOL? If so, which modules should us buy? We have only access to the Solid Mechanics and Heat Transfer modules.
thank you !