December 21, 2022 at 12:46 pmm_gonserSubscriber
i am struggling to define the dynamic viscosity of my fluid in the material properties settings in Fluent.
I received the temperature dependent density and temperature dependent kinematic viscosity of a fluid. Both are given as a polynominal function. As i cannot enter the kinematic viscosity properties of the fluid directly, i want to create a new expression for the dynamic viscosity (Density*Kinematic Viscosity)
The equation is as followed:
(A0 [kg/m^3] * StaticTemperature * StaticTemperature * 1 [K^-2]
+ A1 [kg/m^3] * StaticTemperature * 1 [K^-1]
- B3 [m^2*s^-1]*StaticTemperature^3*1[K^-3]
+ B4 [m^2*s^-1]*StaticTemperature^2*1[K^-2]
- B5 [m^2*s^-1]*StaticTemperature*1[K^-1]
I Also tried to create a new named expression to define the kinematic vicosity with StaticTemperature as variable. But i always get the error "Expression is invalid in current model setup"
I defined the density as a polynomial function already.
I do not have a lot of experience in Fluent and hope one of you guys can help me out here.
Thank you already!
December 22, 2022 at 10:02 amSRPSubscriber
To learn more about expressions, please check the user's guide.: 5.1. Introduction to Expressions (ansys.com)
If you are unable to access the link, follow this forum discussion https://forum.ansys.com/forums/topic/using-help-with-links/#latest
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