Paper Number
IN14 

Session
Flow Induced Instabilities and Non-Newtonian Fluids

Title
Start-up flows of elastoviscoplastic fluids in porous media

Presentation Date and Time
October 21, 2019 (Monday) 5:25

Track / Room
Track 4 / Room 305B

Authors (Click on name to view author profile)

1. Hormozi, Sarah (Ohio University)
2. De Vita, Francesco (KTH, Mechanics)
3. Mitchell, Quinn (Ohio University)
4. Rosti, Marco (KTH Mechanics)
5. Brandt, Luca (KTH Mechanics)

Author and Affiliation Lines (in printed abstract book)
Sarah Hormozi¹, Francesco De Vita², Quinn Mitchell¹, Marco Rosti², and Luca Brandt^2
1Ohio University, Athens, OH 45701; ²Mechanics, KTH, Stockhom, Sweden

Speaker / Presenter 
Hormozi, Sarah

Text of Abstract
We study flows of elastoviscoplastic fluids through porous media by numerical simulations. The porous media is made of cylinders arranged in a periodic fashion. We solve the Navier-Stokes equations combined with the elastoviscoplastic model proposed by Saramito for the stress tensor evolution. This study has two main contributions. First, we show that a nonlinear relationship exists between the pressure drop and the flow rate in the porous medium. This nonlinear relationship depends on plastic, elastic, inertial effects and the configuration of the porous field. Second, we study the details of flow as the limiting pressure gradient is approached, particularly showing how the start-up flows of yield stress fluids are affected with the elasticity of the fluid.