Zoom Discussion / Session

frederichecht · September 21, 2023, 3:00pm

Dear all,

On first Wednesday for each month (with some exception) , I will open a zoom visio session od 2 hours form 10h to 12h (Paris time), to speak about FreeFEM++.

Novelty, Futur, Problem, Bug,.

Remark (it is a short session, so please prepare your intervention before), put a abstract on this Topic,

So the next session will be on October the 4 at 10H ( CEST) I will put the zoom info on the community site in the morning for connection.

frederichecht · October 3, 2023, 7:12am

Dear, the Zoom link for to morrow

Frédéric Hecht vous invite à une réunion Zoom planifiée.

Sujet: Zoom FreeFem++ - Frédéric Hecht
Heure: 4 oct. 2023 09:45 AM Paris

Rejoindre Zoom Réunion

ID de réunion: 974 2509 0023
Code secret: EZmh6S

Plan of the visio:

Introduction of the session
Some new about The FreeFEM day in Paris / an Zoom the 7 and 8 dec 2023.
New about the development
Web site and exemple = P-H Tournier
the idea about the future
Some Question and Remark:
Please add a comment in this discussion session, to prepare a answer.

PS: for the new user, if you have specific problem , if you now if it is a FreeFEM++ good tool to solve it, we will try to give a answer!

frederichecht · November 7, 2023, 10:15pm

The new zoom session is on 8 novembre from 10h00 to 12h00 (Paris Time)

Plan of the visio:

Introduction of the session
Some new about The FreeFEM day in Paris / an Zoom the 7 and 8 dec 2023.
New about the last development
the idea about the future
Some Question and Remark:
Please add a comment in this discussion session, to prepare a answer.

PS: for the new user, if you have specific problem , if you now if it is a FreeFEM++ good tool to solve it, we will try to give a answer!

frederichecht · January 23, 2024, 6:06pm

The zoom discussion session Change now last monday of month form 10h to 11h30 (Paris time)

Frédéric Hecht vous invite à une réunion Zoom planifiée.

Sujet: Zoom meeting FreeFEM de Frédéric Hecht
Heure: 29 janv. 2024 10:00 AM Paris
Chaque mois le Dernier Lundi
29 janv. 2024 10:00 AM
26 févr. 2024 10:00 AM
25 mars 2024 10:00 AM
29 avr. 2024 10:00 AM
27 mai 2024 10:00 AM
24 juin 2024 10:00 AM
Veuillez télécharger et importer les fichiers iCalendar (.ics) suivants dans votre système de calendrier.
Mensuellement: https://cnrs.zoom.us/meeting/tJ0sde-gqTosGN0dyl24GqexGRE7zVag_TTu/ics?icsToken=98tyKuChrzksEtOUthuORox5BYjoM_zwtn5djY0NmAbpUXR0cwbuEdBnZahJEd_v

Rejoindre Zoom Réunion

ID de réunion: 991 2687 1629
Code secret: ff++24

Plan of the visio:

Introduction of the session
Some new about The FreeFEM .
New about the last development
the idea about the future
Some Question and Remark:
Please add a comment in this discussion session, to prepare a answer.

PS: for the new user, if you have specific problem , if you now if it is a FreeFEM++ good tool to solve it, we will try to give a answer!

frederichecht · March 25, 2024, 7:24am

Remember, the zoom discussion session is today a 10h00 (paris Time).
It is open for every body.

frederichecht · April 17, 2024, 7:40pm

Remark, The next session will on april 22 a 10h Paris Time

The Zoom session planifiée.

Rejoindre Zoom Réunion

ID de réunion: 980 1307 0405
Code secret: tky0gg

Remark, If you have specific question please add answer to this discussion

the plan is a usual

FreeFEM news
the next realizes,

Open Discution

remark the may session is 27 mai 2024 10:00 AM

frederichecht · September 9, 2024, 10:07am

Frédéric Hecht repose the FreeF>Em zoom discution sessions for

Novelty, Futur, Problem, Bug,.

Remark (it is a short session, so please prepare your intervention before), put a abstract on this Topic,

So the next session will be on sept the 30/2024 at 10H ( CEST)

the zoom informations are

The Zoom session planifiée.
Sujet: FreeFem open Zoom meeting
Heure: 30 sept. 2024 10:00 AM Paris
Chaque mois le Dernier Lundi
30 sept. 2024 10:00 AM
28 oct. 2024 10:00 AM
25 nov. 2024 10:00 AM
30 déc. 2024 10:00 AM
27 janv. 2025 10:00 AM
24 févr. 2025 10:00 AM
31 mars 2025 10:00 AM
28 avr. 2025 10:00 AM
26 mai 2025 10:00 AM
30 juin 2025 10:00 AM
Veuillez télécharger et importer les fichiers iCalendar (.ics) suivants dans votre système de calendrier.
Mensuellement: https://cnrs.zoom.us/meeting/tJAvduGqqDwoHddhm0xR9Qzyj8eo4RkOrCgW/ics?icsToken=98tyKuCsrDoiGNKSsh6ERowIAIj4WerwpmZBgqdZlBK1GxIKUxnvPLpHPeZNG_fC

Participer Zoom Réunion

ID de réunion: 942 1826 7273
Code secret: FreeFEM25

frederichecht · October 25, 2024, 8:40am

Sorry but the Monday 28 oct. 2024 10:00 AM i could not organize the zoom meeting because I will have not network.

SO the next session will be on 25 nov. 2024 at 10:00 AM

Frederic Hecht.

frederichecht · November 24, 2024, 2:09pm

remember the next session will be on 25 nov. 2024 at 10:00 AM of open zoom Discussion is
the 25 nov. 2024 10:00 AM paris time

Participer Zoom Réunion

ID de réunion: 942 1826 7273
Code secret: FreeFEM25

frederichecht · March 28, 2025, 10:30am

remember the next session will be on 31 mars 2025 10:00 AM Paris of open zoom

Frédéric Hecht vous invite à une réunion Zoom programmée Last Monday of the month

Sujet: FreeFem open Zoom meeting
Heure: 31 mars 2025 10:00 AM Paris

ID de réunion: 942 1826 7273
Code secret: FreeFEM25

The subject:
FreeFEM news , and I will speak about mesh adaptive for exemple.

Monirul25 · March 31, 2025, 3:52am

Sir, it is be very grateful if you discuss how to find order of convergence and efficiency index in FF++. Also, how to implement Dofler marking scheme and refine in poisson codes. Details are in the following paper:
Numerical Methods Partial - 2019 - Cui - A posteriori error estimate for discontinuous Galerkin finite element method on.pdf (1.7 MB)( page no. 9 ( 609 in pdf)) .

Also, it will be very nice if you discuss how to implement time-space adaptive algorithm in a time dependent problem in FreeFem++ ( for example, heat equation). Details are in the following paper:

recovery-type-a-posteriori-error-estimation-of-an-adaptive-finite-element-method-for-cahn-hilliard-equation (1).pdf (1.7 MB)
(Page-35 and 36)

Thanks in advance sir!.

frederichecht · May 26, 2025, 12:21pm

REMARK the last Zoom Discussion / session before summer will be the

Frédéric Hecht vous invite à une réunion Zoom programmée.

Sujet: FreeFem open Zoom meeting
Heure: 23 juin 2025 10:00 AM Paris
Chaque mois le Dernier Lundi
Occurrence(s) modifiée(s) :
23 juin 2025 10:00 AM (mis à jour)
Veuillez télécharger et importer les fichiers iCalendar (.ics) suivants dans votre système de calendrier.
Mensuellement: https://cnrs.zoom.us/meeting/tJAvduGqqDwoHddhm0xR9Qzyj8eo4RkOrCgW/ics?icsToken=DDfBxi8v5GEQIU9PhwAALAAAAO3kWsxAGdgsn4Ns-hMbxDfGSZeMVyj3Fg67w38kBrI5d1VqPoYzNPIikicHOy_do_TgK4uKjg3WBROlljAwMDAwMQ
Participer à la réunion Zoom
Launch Meeting - Zoom

ID de réunion: 942 1826 7273
Code secret: FreeFEM25

The subject is open, but try to think about problem or questionb.

During the session of the 26 may we speak about.

New about freefem++

A to set Dirichet boundary condition in 1 point (dot).

A simple exemple

bc.edp (497 Bytes)

And a other exemple to

github.com/FreeFem/FreeFem-sources

examples/3d/Elasticity-simple-support-BC.md

develop

---
name: Elasticity-simple-support-BC
category: Elasticity
folder: 3d
---
## Linear elasticity with clamped parts of boundary

Homogeneous Dirichlet Boundary conditions are imposed on 2 Edge in 3d for the linear elasticity PDEs.
 The two edges are at the intersection of faces with label 2,5, x==1 (resp.  4,5, x==0).
 The deformation of the structure is due to its own weight.
~~~freefem
mesh3 Th=cube(20,5,5,[x*4,y,z]);
fespace Wh(Th,[P2,P2,P2]) ;

real E = 21.5e4;
real sigma = 0.29;
real mu = E/(2*(1+sigma));
real lambda = E*sigma/((1+sigma)*(1-2*sigma));
real gravity = -100;
~~~

This file has been truncated. show original

For the explanation of the tgv method works see

https://www.ljll.fr/hecht/ftp/5MM30/NotesdeCours5MM30.pdf page 103 (sorry in french)

make a pluging using a fortran function.

Thank to F. Bouchut.

The want to use a numerical flux coded in fortran.

the fortran compressed code is

numflux.f.zip (2.9 KB)

the freefem cpp zip interface is
FBouchut.cpp.zip (2.1 KB)

the exemple is :

FBouchut.edp (100 Bytes)
and the code to compile the pluging (need a compile with all compile)

ff-c++ FFLAGS=-ffree-form  numflux.f   FBouchut.cpp

and to test

FreeFem++ FBouchut.edp
Host-001:FreeVol-2025 hecht$ FreeFem++ FBouchut.edp 
-- FreeFem++ v4.15 (Lun 28 avr 2025 13:31:12 CEST - git v4.15-57-g03b1e0291)
   file : FBouchut.edp
 Load: lg_fem lg_mesh lg_mesh3 eigenvalue 
    1 : load "FBouchut"
    2 : 
    3 : real[int] A=[1,2,3,4,5];
    4 : real[int] B(10);
    5 : 
    6 : Flux(A,B);
    7 : cout << " B = " << B << endl; sizestack + 1024 =1136  ( 112 )

 B = 10	
	  0	  0	  0	  0	  0
	  0	  0	  0	  0	  0
	
times: compile 0.012662s, execution 2.2e-05s,  mpirank:0
 CodeAlloc : nb ptr  3900,  size :499344 mpirank: 0

Topic		Replies	Views
The freefem days zoom conference number General Discussion	2	205	December 7, 2023
FreeFEM days Thursday 10 & Friday 11, December (virtual conference) General Discussion	3	428	December 10, 2020
Join us for the FreeFEM Days 11th edition in Paris! General Discussion	1	600	October 4, 2019
FreeFEM days Thursday 7 & Friday 8, December (Zoom link available) General Discussion	3	293	December 19, 2023
FreeFEM days Thursday 9 & Friday 10, December (hybrid conference) General Discussion	5	661	December 12, 2021

The zoom discussion session Change now last monday of month form 10h to 11h30 (Paris time)

A to set Dirichet boundary condition in 1 point (dot).

make a pluging using a fortran function.

Related topics