Flow over cylinder laminar and transient description mesh resolution

Arizona State University
MAE 560: Applied Computational Fluid Dynamics Fall 2022

Project 3
Report

Reynolds Number Calculation:
The values of density and dynamic viscosity were determined from the fluent database.

Figure 2: Streamline function at t = 1 min for Task 1

Figure 3: Vorticity Magnitude at t = 1min for Task 1

Figure 7:Lift Force v/s flow time plot from t=0 to t=1 min for Run 1 - Vertical Ellipse

Figure 8: Lift Force v/s flow time plot from t=0 to t=1 min for Run 2 - Horizontal Ellipse

Figure 11: Contour plot of x-velocity at θ = 25o

Figure 12: Contour plot of x-velocity at θ = 50o

Figure 14: Contour plot of y-velocity along plane of symmetry for Task 3 (Run 1)

Description: From the above contours, it is observed that the wake formation (shadow region) has a velocity in the negative direction. Additionally, as we go above the pentagon building, the effect of building on the air flow (wind velocity) is reducing to a point that at the highest layers are practically at the same velocity i.e., ≈ 49.6 m/s.

Task 4: Laminar flow over an asymmetric shape for 1 min D10: Contour plot of the stream function at t = 1 min

Figure 18: Plot of lift force v/s flow time for 1 min

Geometry: The overall width and height of the geometry is 4 cm. Comparable with the Task 1 circular geometry. Description: With the above asymmetric geometry, it is evident that the Lift Force [N] is oscillating between ± 0.05 N which is relatively higher than the circular and vertical ellipse cross-section cylinder. The period is ≈6 sec.