StabFem project

StabFem is both a Matlab/Octave interface to the FreeFem++ software allowing to use this powerful PDE solver within a practical working environment, and a set of programs devoted to study instability and wave phenomena in fluid mechanics.


Documentation


Tutorial programs

This section presents a number of commented programs allowing to easily understand the implementation principles.The programs are published in html form but the corresponding .m files are all available from the project repository.

Thermal Conduction in a L-Shape domain

This first simple example allows to demonstrate the basic features of Stabfem for importing and plotting results from FreeFem++ programs

Linear stability analysis of the wake of a cylinder

This second example demonstrates how to use StabFem to perform the basis steps of a linear stability analysis : generation of an adapted mesh, computation of a base flow, computation of eigenmodes, and plotting the results.

Direct Numerical Simulation (DNS) of the wake of a cylinder

This example shows how to use StabFem to perform a DNS. We consider again the flow around a cylinder at Re=60.

Acoustic pipes

This example demonstrates how to use StabFem to solve a linear acoustics problem, namely wave radiation from a cylindrical pipe opening to a semi-infinite domain.

Sloshing

This example shows how to use StabFem to compute eigenmodes in a free-surface problem

Nonlinear stability analysis of the wake of a cylinder

In this program we demonstrate how to study the development of Bénard-Von Karman vortex street in the wake of a cylinder using nonlinear global approaches : Weakly Non Linear (WNL) and Harmonic-Balance (HB) approaches

Publication-related programs

This section presents a number of programs reproducing the main results of a number of published research papers.

Wake of a cylinder

These three programs reproduce all the figures from the review paper

A practical review on linear and nonlinear global study of fluid flow instabilities" by D. Fabre et al.

Jet flow through a circular aperture of finite thickness

This program reproduces the main results of the following research paper : "Acoustic and hydrodynamical instability of the jet flow through a finite thicnkess hole" by R. Longobarddi, D. Fabre, V. Citro & P. Luchini (JFM, submitted, 2019)

Linear oscillations of a liquid bridge

This program reproduces the main results of the following research paper : "Oscillations of a liquid bridge resulting from the coalescence of two droplets", by V. Chireux, D. Fabre, F. Risso & P. Tordjemann (Phys. Fluids, 27(6):062103, 2015)

Rotating-polygon instability of a free-surface swirling potential flow

This program reproduces the main results of the following research paper : "On the instabilities of a potential vortex with a free surface", by J. Mougel, D. Fabre, L. Lacaze & T. Bohr (J. Fluid Mech. 824, 230-264 2018)

Developer's section

The project currently comprises a number of additional cases in various stage of development.

Contributors

The StabFem project is hosted by the Institute of Fluid Mechanics in Toulouse (IMFT). It is developed as a collaborative project and currently involves contributors from IMFT and Università di Salerno.

List of current contributors / users :

- David Fabre (IMFT)

- Maxime Pigou (IMFT)

- Vincenzo Citro (UNISA)

- Diogo Ferreira Sabino (ONERA / IMFT)

- Javier Sierra (IMFT)

- David Lo Jacono (IMFT)

- Flavio Giannetti (UNISA)


Reach us

You may reach us directly from the gitlab repository, or through our mailing-list.

  • Address

    Institut de Mécanique des Fluides de Toulouse
    2, Allée du Professeur Camille Soula
    31400 Toulouse, FRANCE
  • Developper mailing-list

    stabfem-dev@groupes.renater.fr