Dear George, Comsol can import data files like .txt; you can read it as input for boundary or initial conditions, or you can approximate them using a function which can be introduced as source.  Gianluca

A direct way is offered by Ansys Fluent for Fluid Flow and Heat Transfer problems. As far as I  know in Comsol the best way is to "approximate them using a function which can be introduced as source" that Gianluca proposed.  Vasilis.

Thanks a lot for the recommendation. I will try . Best. George