Week 2 - Flow over a Cylinder.

Flow over a Cylinder

Aim: To calculate flow over cylinder for varying reynolds number

Objective:

Part - 1

1. Simulate the flow with the steady and unsteady case and calculate the Strouhal Number for Re= 100.

PART-II

1. Calculate the coefficient of drag and lift over a cylinder by setting the Reynolds number to 10,100,1000,10000 & 100000. (Run with steady solver)
2. Discuss the effect of Reynolds number on the coefficient of drag

Procedure:

Create the geometry in Space claim.

Mesh the geometry

Element : Triangular

Inflation : 5e-3 m

Create the Setup:

Solver :

Steady State

Pressure-based

Part 1:

Re=100

Steady state

Velocity contour

Unsteady state

Strouhal number= 1

Part 2:

Re=10

Velocity contour:

Pressure contour:

Drag co-effecient

Lift co-effecient:

Re =100

Velocity contour

Pressure Contour:

Drag- Coeffecient

Lift- Coeffecient:

Re= 1000

Velocity contour:

Pressure contour:

Drag co-effecient

Lift co-effecient:

Re= 10000

Velocity contour:

Pressure contour:

Lift co-effecient:

Drag co-effecient:

Re=100000

Velocity contour:

Pressure contour:

Lift co-effecient:

Drag co-effecient:

Conclusion:

Flow over cylinder for varying Reynolds number is calculated.

For Higher Reynolds number the co-effecient of drag varies for wide range of values.

Von-Karman vortex phenomenon is displayed behing the cylinder.