Flow over a cylinder

AIM: To simulate the flow over a cylinder for the conditions shown in the video.

• To calculate the baseline case Reynolds number.

o Re = rho' U_inlet*D/mu

o D = cylinder diameter

o mu = dynamic viscosity

o rho = density

• To run a baseline simulation and then calculate the Reynolds number. Then increase the Reynolds number by a factor of 20%, 40%, and 100% then run the transient flow simulation.

• To simulation end time should be calculated properly

• To create animations for pressure-velocity for all the three Reynolds number.

PROCEDURE: A cylinder of the following dimensions is made

L=0.05m

D=0.08m

A computational domain of length 0.5m for external flow is created using flow wizard.

For Air Re=1.225kg/m^3

mu=1.21x10"-3

v=15m/s, 18m/s, 21m/s, 30m/s (v increase with increase in reynolds number)

A time dependent sudy with total analysis time 0.1 sec and 0.01 sec A cut plot is created a the midle of the cylinder parallel to the front plane. The simulation is run and animation is created for the followiing conditions. Animation is created byresults->animation->insert->animation wizard opens In that time is given as 10 seconds, revolve option is left unchecked, scenario option is checked and results are plotted uniformly for a duration of 0.01s. using the formula and dat the values of velocity for Reynolds number by a factor of 20%, 40%, and 100% are found out.

Re=rho' U_inlet*D/mu

Simulation end time (T)=2(lengtgh of computational domain/velocity)
T = 2(0.05/15) = 0.0666

ANIMATION LINKS

https://drive.google.com/file/d/1QXhlYArUyMoQ0X9NwzwirJxTjWe5XkIV/view?usp=sharing

https://drive.google.com/file/d/1l8mFo5bM20ZrTVgpam_Rnf84kYUsO4fH/view?usp=sharing