Simulating and animating the transient flow over a cylnder for different reynolds number
Aim:
Simulate the flow over a cylinder for the conditions
- To Calculate the baseline case Reynolds number.
- 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.
Procedure for simulation:
Step 1 : sketch a cylinder with diameter 10 mm and length 100mm using the cylinder and extrude tool.
.
Step 2 : Now create a new flow simulation click wizard button in flow simulation tab.give the project name and next step select the analysis type as external and select the time dependent feature and give the total analysis time as 1s and output time setup as .1s
Step 3 : In the next step of the wizard select the fluid as air.
step 4 : In Next step of the wizard give the velocity parameter as 5m/s and click ok creating the computational domain.
Step 5 : Now define the mesh by edit defintion in global mesh and select automatic and increase the level to 4.
Step 6 : Now to analyse the flow at the centre make a cut plot in the center of the cylinder and select the countour as velocity and now create a cut plot in same location and select the countour as pressure for analysing the pressure change.
Step 7 : Now run the simulation and after the completion of the calculation make a animation of the of the flow by inserting the animaton in results.
Step 8 : Now calculate the reynolds number and for the baseline simulation by using the formula
- Re = rho*U_inlet*D/mu
and then increase the reynolds by factor 20% , 40 % and 100% and calculate the inlet velocity for the correspondig reynolds number respectively.
Step 9 : Now simulate the transient flow for different inlet velocities calculated and create animations for pressure and velocity for the particular velocity.
RESULT:
Thus the transient flow over cylinder for various reynolds number has been simulated and the animation is created. so by observing the simulation and animation i conclude that the flow analysis is correct and reliable.
FILES: https://drive.google.com/open?id=1zpnGrxARkNUsUY1jins-eWAFGSIIhljd
https://drive.google.com/open?id=1NN3gQtOvBQkw-Fg4CzTNnwoIl2Ewdt0X
https://drive.google.com/open?id=1H2LoB5X8RkT6MuUvuv7M7Qy7TtKCe5Ki
https://drive.google.com/open?id=1_mFwHm448mRXHvtELV35tASLa9_vO9y1
https://drive.google.com/open?id=1z2I7-3wgmIqdVXLmYQ1Fdg7WGnLk9lOC
https://drive.google.com/open?id=1mjPPSCyiuezlfN-3LIqre-AY4x08E--4
https://drive.google.com/open?id=1D39Fjy6ICF2E2Q8xO42gCBesbOFOqNld
https://drive.google.com/open?id=1fhpetHt7kvln0tpU2-NkpcqEeJ7vsr0U