[sanj]

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.