FreeFem++ version 2.24-3

FreeFem++ team : Olivier Pironneau, Frédéric Hecht, Antoine Le Hyaric.

Please send questions, comments and bug reports to Frédéric Hecht or to the FreeFem++ mailing list.

 

Introduction

 

FreeFem++ is an implementation of a language dedicated to the finite element method. It enables you to solve Partial Differential Equations (PDE) easily. Problems involving PDE from several branches of physics such as fluid-structure interactions require interpolations of data on several meshes and their manipulation within one program. FreeFem++ includes a fast quadtree-based interpolation algorithm and a language for the manipulation of data on multiple meshes (generated with bamg). FreeFem++ is written in C++ and the FreeFem++ language is a C++ idiom. It runs on any Unix-like OS (with g++ version 3 or better, X11R6 or OpenGL with GLUT) Linux, FreeBSD, Solaris 10, Microsoft Windows (95, 98, 2000, NT, XP) and MacOS X (native version using OpenGL). FreeFem++ replaces the older freefem and freefem+.

 

Quick Start

 

Unix Linux, FreeBsd, Solaris 10, ... Windows 98, NT, 2000, XP MacOS X Universal ( 10.3 or + ) Documentation Online Demonstration   Download this sources archive, decompress, compile and run Download this EXE and run it Download i386+ppc, decompress and run Full documentation : freefem++doc.pdf Try FreeFem++ online at : LJLL Software Online

• To compile FreeFem++, go into the FreeFem++ directory and type :
  ./configure
  make
  make install (as root).

   

• For all other platforms and versions, please refer to the full list of downloads.

 

Documentation

 

To receive the manual of FreeFem++ 2.21 in book form, send three blank DVDs and your postal address to : Dr FREEFEM++ Laboratoire JL Lions University of Paris VI 175 rue du Chevaleret 75013 Paris France This offer is open the new reedition of the book is now available

• New Manual (freefem++doc.pdf) (5117.7 Kb Tue Apr 1 12:07:23 2008). This is a complete rewrite with lots of examples.
• INNOVATION : last news.
• HISTORY : life of the software from 2005.
• HISTORY_BEFORE_2005 : life of the software before 2005.
• Old obsolete but shorter version of the full manual still available as manual.pdf (1601.6 Kb Wed Mar 16 16:56:44 2005).

 

News

1/10/2005 Read or participate in general discussions about FreeFEM++ with the FreeFEM++ mailing list

23/9/2005 FreeFem++ and OpenFEM presentation day at IHP (Paris) : details, slides and examples

 

Examples

• A small movie (340Kb) : Cool air (green) comes from the lower left and mix with hot air (magenta), the right boundary is free. This is Navier-Stokes-Boussinesq integrated with P1-bubblle P1 mixte finite element.

• A very small example of how to solve the Poisson equation on a L shape :

  border aaa(t=0,1){x=t;y=0;}; border bbb(t=0,0.5){x=1;y=t;}; border ccc(t=0,0.5){x=1-t;y=0.5;}; border ddd(t=0.5,1){x=0.5;y=t;}; border eee(t=0.5,1){x=1-t;y=1;}; border fff(t=0,1){x=0;y=1-t;}; mesh Th = buildmesh (aaa(6) + bbb(4) + ccc(4) +ddd(4) + eee(4) + fff(6)); fespace Vh(Th,P1); // to change P1 in P2 to make P2 finite element. Vh u=0,v; func f= 1; func g= 0; int i=0; real error=0.1, coef= 0.1^(1./5.); problem Probem1(u,v,solver=CG,eps=-1.0e-6) = int2d(Th)( dx(u)*dx(v) + dy(u)*dy(v)) + int2d(Th) ( v*f ) + on(aaa,bbb,ccc,ddd,eee,fff,u=g) ; for (i=0;i< 10;i++) { real d = clock(); Probem1; // solve the problem plot(u,Th,wait=1); Th=adaptmesh(Th,u,inquire=1,err=error); error = error * coef; } ;

  Solution on adapted mesh and associated mesh.

• 3D implementation: new solver, new mesh tools, new kind of finite element
• There will be some changes in the general policy for FreeFEM (GNU Public License, GPL) 

 

Full List of Downloads

The current version of Freefem++ is 2.24-3. You can get the latest source from an anonymous CVS server with the following unix shell commands :

cvs -d :pserver:anonymous@idared.ann.jussieu.fr:/Users/pubcvs/cvs login (password = freefem++)
cvs -d :pserver:anonymous@idared.ann.jussieu.fr:/Users/pubcvs/cvs co freefem++

Self-contained archives for all other systems :

This directory contains all the different versions of FreeFem.

 

Page written by

Frédéric Hecht and Antoine Le Hyaric

Last modified : Fri Apr 11 16:55:27 2008