Simplified First Principle Model for Severe Anne Sofie Nilsen: Simplified First Principle Model for Severe Slugging Flow in S-shaped Risers Supervisor: Sigurd Skogestad Co-Supervisor: Esmaeil Jahanshahi

Offshore field

OLGA - Simulations

Experiments

Flow Diagram

Olga Stability map: Experimental Stability map:

Olga (S) vs. Experiment (S):

Experiment (S) vs. Simple Model (L)

Olga (S) vs. Simple Model (L):

Concluding Remarks Do more work with OLGA Make the extended model for S-riser More research and comparison