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Non-Newtonian Power Law for Viscosity

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Old   September 6, 2008, 14:15
Default Non-Newtonian Power Law for Viscosity
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John
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I am trying to set viscosity to non-newtonian power law for non-newtonian liquid. In the materials panel, the drop down list does not show non-newtonian power law (it shows constant, piecewise linear, piecewise polynomial, polynomial, power law, sutherland, kinetic theory and user defined).

32.3.15 of the user manual states that I should be able to select non-Newtonian power law and then set consistency index, power law index, reference temp, and min & max viscosity limits.

Please advise how I can access the non-newtonian power law function?
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Old   September 7, 2008, 06:19
Default Re: Non-Newtonian Power Law for Viscosity
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jay
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Hi John,

I think you have selected viscous model as turbulent..please change to laminar.

Non newtonian models are available with only laminar viscous models.

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Old   September 25, 2008, 01:36
Default Re: Non-Newtonian Power Law for Viscosity
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PraveenKumar R
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There is no model that can be used for viscosity as we need non-Newtonian power law. To enable the model, issue the text user interface command as:

define/models/viscous/turbulence-expert/turb-non-newtonian> Enable turbulence for non-Newtonian fluids? [no] yes

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Old   July 15, 2014, 05:46
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Kirill
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I began to learn the Ansys Fluent and the first task for me - the determining the pressure drop in pipe with non-newtonian fluid.
The Flow mode - turbulent.
I found your post about opportunity to switch turbulence for non-newtonian fluid!

"To enable the model, issue the text user interface command as:

define/models/viscous/turbulence-expert/turb-non-newtonian> Enable turbulence for non-Newtonian fluids? [no] yes"

Can you tell me how to go to the text user interface command mode?

Many thanks!
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Old   July 15, 2014, 09:49
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Quote:
Originally Posted by Kirill View Post
I began to learn the Ansys Fluent and the first task for me - the determining the pressure drop in pipe with non-newtonian fluid.
The Flow mode - turbulent.
I found your post about opportunity to switch turbulence for non-newtonian fluid!

"To enable the model, issue the text user interface command as:

define/models/viscous/turbulence-expert/turb-non-newtonian> Enable turbulence for non-Newtonian fluids? [no] yes"

Can you tell me how to go to the text user interface command mode?

Many thanks!
See attached image.
Enter commands in the command window; you have to type define and press enter, then type models and press enter, and so on.

Daniele
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Old   July 16, 2014, 03:49
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Kirill
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Many Thanks for help!

Now I will try to use this option to calculate the flow in the pipe.

Thanks!
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Old   November 26, 2014, 09:44
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I have done the above described thing.
But i couldnot found power law model in models


my intention is to calculate the velocity differences for dilatant and pseudoelastic fluid.



thanks in Advance
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