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Here is my implementation of Van-Leer fluxes (and Jacobians) in the following C code. It has the following functionality:

1. Has a special python script for plotting contours on unstructured grids! I wrote this Python script to get rid of third party packages like Tecplot and Fieldview. I can plot any contour using Python script right away in my C-code without calling external program.
2. Solves two-dimensional Euler equations with first-order and second-order spatial accuracy.
3. Implements Van-Leer fluxes and Jacobians. (Analytical Jacobians)
4. Has built-in explicit and implicit time-marching schemes.
5. Reads arbitrary unstructured grid in ".mesh" format.
6. Has a library for verification and validation using method of manufacturing solutions. Below are some results for NACA0012 airfoil