pyshockflow

What is this repository for?

• Resolution of quasi-1D flow problems for ideal and real gases.
• Learning of numerical flux schemes, effects and implementation.
• Implementation and testing of new numerical schemes to solve the 1D Euler Equations.
• Study of non-ideal and non-classical gas dynamics effects.

How do I get set up?

• Git clone the present folder in your system

• Go to the root folder and create a new python environment (pyshockflow) through yml file:

conda env create -f environment.yml

• Activate the environment:

conda activate pyshockflow

• Install the packages:

python -m pip install -e .

• Navigate to the regression folder and run the automated tests:

./run_all.sh

this should print completed tests if everyting works correctly

• The testcases folder has several cases, where input parameters are specified inside every input.ini file. To run a case:

python main.py

Notes

• The code has been written for Mac OS systems, so there is the chance for some path-related commands to not run correctly on windows based machines. It should be quite easy to fix. With time the code will be made more universal.

• The technical details can be found in the related article ... (soon to be submitted)

Results Example

Godunov Scheme for ideal gas (air)

Test case for ideal gas (air), documented in [1]. The following picture reports the comparison between the reference data obtained with the analytical Riemann Solver, and the simulation results obtained with the Godunov scheme for ideal gas:

CO2 with real gas effects

Test case for real gas effects documented in [4]. The generalised Roe's scheme formulation has been taken from [2]. The following picture reports comparison between the reference data from the article, and two simulations run with the Roe's generalized scheme for real gas, with and without Entropy fix.

Contribution guidelines

• Validate the modifications by means of detailed test cases
• Ensure regression tests still work and extend them if needed
• update input files and run scripts if needed

Authors and contacts

• Francesco Neri, TU Delft, f.neri@tudelft.nl
• Matteo Pini, TU Delft, m.pini@tudelft.nl

References

[1] Toro, Eleuterio F. Riemann solvers and numerical methods for fluid dynamics: a practical introduction. Springer Science & Business Media, 2013.

[2] Arabi, Sina, Jean-Yves Tr�panier, and Ricardo Camarero. "A simple extension of Roe's scheme for real gases." Journal of Computational Physics 329 (2017): 16-28.

[3] Blazek, Jiri. Computational fluid dynamics: principles and applications. Butterworth-Heinemann, 2015.

[4] D�Alessandro, Simone, Marco Pizzarelli, and Francesco Nasuti. "A hybrid real/ideal gas mixture computational framework to capture wave propagation in liquid rocket combustion chamber conditions." Aerospace 8.9 (2021): 250.

[5] Hirsch, Charles. Numerical computation of internal and external flows: The fundamentals of computational fluid dynamics. Elsevier, 2007.