ENME 595
Computational Fluid Dynamics Laboratory #2

Objectives

1. To measure the oblique shock wave angles in the supersonic flow over a 23º wedge and cone at Mach numbers of 1.5, 2.0, and 2.25.

2. To predict the flow quantities before and after the oblique shock waves, and compare these with experimental values and theoretical predictions.

 Background

For this CFD lab you will perform the first half of the oblique shock wave lab using a CFD package. The package is capable of calculating the formation of oblique shock waves over both wedge and cone models using an inviscid model. The wedge simulations are two-dimensional while the cone models are two-dimensional and axisymmetric.

General information on the visualization package and the CFD code can be found at the following web address: http://www.ucalgary.ca/~dnwillia/595.html. The visualization package for this lab is called Fieldview, and can be run on the SGI workstations in the third floor UNIX workstation room. The executable for Fieldview can be accesseed by simply typing /local/fv/bin/fv on workstation m38 and /usr/local/fv/bin/fv on m39. A manual with a tutorial is available in the library.

Calculations, Results, and Discussion

1. Run the CFD code at each Mach number for the wedge and the cone, and save the results. Ensure that you run the simulation long enough to get a steady solution.

2. Load the results into Fieldview, and determine all the flow quantities before and after the shock wave.

3. Determine the shock wave angles, and compare with what you obtained in laboratory 2.

4. Discuss any differences between the results you obtained, and why they may be different than the experimental or theoretically predicted values.

5. Discuss the limitations of using an invicsid two-dimensional computational model for these simulations. Does this effect the results, and in what way?