docs

**This is an old revision of the document!**

- Tutorials
- User Guide (detailed but outdated, for version 0.9.x)

- The Newton-Krylov-hookstep algorithm for finding equilibria and periodic orbits

Channelflow includes a number of predefined command-line utilities that perform common calculations for research in the dynamics of turbulence. Most utilities read a velocity field from disk, operate on it according to command-line options, and save the resulting fields or data to disk. See utility options for an overview of the option/argument syntax.

program name | purpose |
---|---|

addfields | compute sum a_n u_n and store result to disk |

arnoldi | compute the eigenvalues and eigenfunctions of eqbs and orbits |

ascii2field | convert a file of ASCII data to a channelflow FlowField |

changegrid | change the discretization or box size of a field |

continuefields | quadratic continuation of fields against arbitrary parameter |

continuesoln | quadratic continuation of solutions against Re, Lx or Lz |

couette | integrate an initial condition, save results to disk |

field2ascii | convert a binary FlowField datafile to a file of ASCII data |

field2hdf5 | convert a binary FlowField datafile to a HDF5 datafile |

fieldplots | extract a number of 2D slices of the 3D field, good for plots |

fieldprops | print out norms, symmetries, geometrical data of a stored field |

findsoln | compute an equilibrium, traveling wave, or periodic orbit of plane Couette |

L2Dist | compute the L2 distance between two fields |

L2IP | compute the L2 inner product |

makebasis | construct an orthonormal basis from a set of fields |

makeheatmode | construct a field that decays in time according to Laplace eqn |

makemovie | extract slices of fields in order to make a movie |

makestokesmode | construct a stokes eigenfunction of laminar equilibrium |

perturbfield | add random perturbations to a given field |

poincare | compute a poincare section of plane couette or channel flow dynamics |

projectfields | project a set of fields onto a given basis |

projectseries | project a sequence of fields onto a given basis |

randomfield | build a random initial velocity field, save to disk |

seriesprops | compute statistics on a sequence of data |

symmetrize | find the phase shift of a field that optimize a given symmetry |

symmetryop | apply a given symmetry to a field |

Some C++ basics.

C++ class | header file | represents |
---|---|---|

FlowField | flowfield.h | spectral expansions of scalar, vector, tensor fields (e.g. velocity) |

DNS | dns.h | Direct Numerical Simulation algorithms (i.e. time-stepping scheme) |

FieldSymmetry | symmetry.h | the symmetry group of FlowFields |

docs.1417708305.txt.gz · Last modified: 2014/12/04 07:51 by gibson