Week 2 - Flow over a Cylinder.

Aim: To study the Flow over a Cylinder using ANSYS FLUENT.

Theory: YPlus

Procedure:

Step 1: Open spaceclaim and create the 2D cylinder with appropriate dimensions.

Step 2: Mesh the surface with 0.25m element size triangle.

Step 3: Setup the simulation- steady state with velocity of 2.5m/s, density of 1kg/m3 and viscosity of 0.05 N-s/m2 i.e, Re=100.

Step 4: Find the values of Strouhal Number, coefficient of drag and lift .

Step 5: Repeat the steps for Re=1000,10000 & 100000 steady state and for Re=100 transient state.

Reference: https://www.sciencedirect.com/science/article/pii/S0307904X08000243

https://doi.org/10.1155/2015/628632

Conclusion: There are 43000 elements and vortex shredding is visible at laminar flow at certain Reynolds number.

Result: Lift coefficient decreases rapidly and drag coefficient increases rapidly when Reynolds number is decreased below critical range.