1. CFD Modeling and Simulation for the Waller Creek Tunnel/8 th St. Lateral Junction Alden Research Laboratory Inc. 30 Shrewsbury St., Holden, MA Preliminary Results By:

2. CFD Model Geometry

3. 103.41’ 100’ Transition 50’ = 16’ 57.75’ = 16’ Plan View Profile View A A B B Section A-ASection B-B 10 ‘ 21.169’ 19.1083’ R = 10.21’ R = 11.175’ Θ = 45 o

4. Boundary and Flow Conditions Tunnel Inflow Outflow Junction Inflow

5. Computational Mesh: ~ 310,000 cells

6. Waller Creek (WC) Tunnel Flow Scenarios Return Period1 yr2 yr5 yr10 yr100 yr500 yr Proposed - Lag Tunnel / Peak Intervening Flow ( 8th Street Lateral Junction) Tunnel Flow (12th St. Inlet)6329791972274346936208 8th St. Connector Tunnel Flow26033554770012581701 % Flow of 8th St. Connector Tunnel41.1%34.2%27.7%25.5%26.8%27.4% Proposed - Lag Tunnel / Peak Intervening Flow ( 4th Street Lateral Junction) Tunnel Flow (12th St. Inlet + 8th St. Inlet)89213142519344359517909 4th St. Connector Tunnel Flow1942393614477631015 % Flow of 4th St. Connector Tunnel21.7%18.2%14.3%13.0%12.8% Flow Scenarios:

7. Lag Tunnel / Peak Intervening Flow ( 8 th Street Lateral Junction) 100 Year Return Period (Uniform Inflow at Lateral Junction Inlet)

10. Lag Tunnel / Peak Intervening Flow ( 8 th Street Lateral Junction) 1 Year Return Period (Non-uniform Inflow at Lateral Junction Inlet)

17. Lag Tunnel / Peak Intervening Flow ( 8 th Street Lateral Junction) 1 Year Return Period (Uniform Inflow at Lateral Junction Inlet)