Power law viscosity

Jalil Khan · February 25, 2017, 04:26

how can one enter a power law viscosity relation in Ansys Fluent

raminostadi · February 27, 2017, 08:11

Quote:

Originally Posted by Jalil Khan

how can one enter a power law viscosity relation in Ansys Fluent

Hi. Fluent has non newtonian power law viscosity model and you don't need to write a udf for it.just go to material and choose non newtonian powerlaw viscosity from viscosity tab and inter power law index (n) and K and 2 other parameters. This parameters depend on material properties. Also you can write a udf for it. Do you want write udf for it?

Jalil Khan · February 28, 2017, 01:35

Ok, Thanks!
What is the refrence value the programme is taking to calculate drag,or lift and other values ,say for K=1,n=1.8 and some limit of viscosity.
Can u help me write a progamme?

raminostadi · February 28, 2017, 06:48

Unfurtunetly, I don't know the relation between powerlaw viscosity and calculating drag or lift.

KevinZ09 · February 28, 2017, 07:38

Quote:

Originally Posted by Jalil Khan

Ok, Thanks!
What is the refrence value the programme is taking to calculate drag,or lift and other values ,say for K=1,n=1.8 and some limit of viscosity.
Can u help me write a progamme?

For post-processing, such as calculating force and moment coefficients, Fluent will use the reference values you specified in the Reference Values panel.

liliana · September 3, 2018, 18:45

Quote:

Originally Posted by raminostadi

Hi. Fluent has non newtonian power law viscosity model and you don't need to write a udf for it.just go to material and choose non newtonian powerlaw viscosity from viscosity tab and inter power law index (n) and K and 2 other parameters. This parameters depend on material properties. Also you can write a udf for it. Do you want write udf for it?

How can i do an isothermal simulation using fluent model for power law viscosity? It requires some parameters of temperature.

LuckyTran · September 4, 2018, 12:51

Quote:

Originally Posted by liliana

How can i do an isothermal simulation using fluent model for power law viscosity? It requires some parameters of temperature.

Use a constant viscosity. Calculate what this viscosity is using power law separately on your phone or whatever.

February 25, 2017, 04:26	Power law viscosity	#1
Jalil Khan New Member Jalil ul rehman Join Date: Feb 2017 Posts: 5 Rep Power: 9	how can one enter a power law viscosity relation in Ansys Fluent

February 28, 2017, 01:35	Fluent non newtonian	#3
Jalil Khan New Member Jalil ul rehman Join Date: Feb 2017 Posts: 5 Rep Power: 9	Ok, Thanks! What is the refrence value the programme is taking to calculate drag,or lift and other values ,say for K=1,n=1.8 and some limit of viscosity. Can u help me write a progamme?

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February 28, 2017, 06:48		#4
raminostadi Member ramin Join Date: Jul 2016 Posts: 41 Rep Power: 9	Unfurtunetly, I don't know the relation between powerlaw viscosity and calculating drag or lift.