Viscoelastic fluids

Hi,

I need to model a two-phase flow with water and a viscoelastic oil. Are there any in-built viscoelastic models available for fluids (like UCMaxwell, Oldroyd-B, PTT, etc) ? I can find such models under solid mechanics tab (for solids) but are there any similar in-built viscoelastic models for fluids ?

Manyunat