Transient Viscosity
 

Hello guys,

If I want to make the BirdCarreau non-newtonian viscosity model dependent on time; how can i get this done? In other words, the following is the model:

nuInf_
+ (nu0_ - nuInf_)
*pow(scalar(1) + sqr(k_*strainRate()), (n_ - 1.0)/2.0);

Now if I need to change it as follows:

nuInf_
+ (nu0_ - nuInf_)
*pow(scalar(1) + sqr(k_*strainRate()), (n_ - 1.0)/2.0) + 2*currentTime*nu0_;

How can i get the value of currentTime? currentTime is the value of time at that particular instant.

Please help me.

Never mind. Problem solved

Hello,

could you please explain how you did to get the current time value? I need to set a time-dependent value of the viscosity.

Thank you.

David