Sign-up for free online course on ANSYS simulations!Author: Rajesh Bhaskaran & Yong Sheng Khoo, Cornell University
Problem Specification
1. Create Geometry in GAMBIT
2. Mesh Geometry in GAMBIT
3. Specify Boundary Types in GAMBIT
4. Set Up Problem in FLUENT
5. Solve
6. Analyze Results
7. Refine Mesh
Problem 1
Problem 2
Step 6: Analyze Results
Plot Velocity Vectors
Let's plot the velocity vectors obtained from the FLUENT solution.
Display > Vectors
Set the Scale to 14 and Skip to 4. Click Display.
From this figure, we see that there is a region of low velocity and recirculation at the back of cylinder.
Zoom in the cylinder using the middle mouse button.
Pressure Coefficient
Let's plot pressure coefficient vs x-direction along the cylinder.
Pressure Coefficient is a dimensionless parameter defined by the equation 
where p is the static pressure, p ref is the reference pressure, and q ref
is the reference dynamic pressure defined by 1/2 * p ref v ref 2 .
Now, let's take a look at the Contour of Pressure Coefficient variation around the cylinder.
Display > Contours
Under Contours of, choose Pressure.. and Pressure Coefficient. Select the Filled option. Increase the number of contour levels plotted: set Levels to 100.
Click Display.
Because the cylinder is symmetry in shape, we see that the pressure coefficient profile is symmetry between the top and bottom of cylinder.
Plot Stream Function
Now, let's take a look at the Stream Function.
Display > Contours
Under Contours of, choose Velocity.. and Stream Function. Deselect the Filled option. Click Display.
Enclosed streamlines at the back of cylinder clearly shows the recirculation region.
Plot Vorticity Magnitude
Let's take a look at the Pressure Coefficient variation around the cylinder. Vorticity is a measure of the rate of rotation in a fluid.
Display > Contours
Under Contours of, choose Velocity.. and Vorticity Magnitude. Deselect the Filled option. Click Display.
Go to Step 7: Refine Mesh