Simulation of a 2D pulsating laminar CH4/N2 flame

This dataset contains the numerical simulation of a pulsating laminar CH4/N2 flame.The flame is excited by modulating the inlet velocity at a frequency equal to 10 Hz (f10) and at a complex frequency obtained by combining frequencies at 10, 20 and 80 Hz (fcomplex) (see https://doi.org/10.1016/j.ijmecsci.2023.108219 for details).

The dataset contains three files. In the "pod" files, the two simulations are organised as data matrices D of shape n times m  where n is the number of computational cells (n_c) times the number of features (n_f) and m is the number of time steps. The matrix D is obtained by the concatenating along the rows n_f data matrices D_i of shape n_c times m:

D = [D_1, ..., D_n_f]. 

For each simulation:- n = 42668 (2 features and 21134 cells).- the features are temperature and the mass fractions of OH.- the temperature is in K.- m = 516.- the time step between the snapshots is 5e-4 s (the simulation goes from t=0 s to t=0.258 s).

The "pca" file contains the data from both simulations and has shape (n_c*m) times n_f:- n_f = 9 which are temperature and the species mass fraction of CH4, CO, CO2, H2, H2O, N2, O2, OH.- m = 256. 

The file 'grid.vtu' contains the computational grid used to solve the CFD simulations. It can be opened using VTK-based software such as Paraview or Pyvista.

The file 'example.py' is a python script that contains an example on how to load and visualise the dataset.