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Comptes Rendus
Mécanique
Catherine Colin and Guillaume Legros
Foreword
Volume 351, Special Issue S2 (2023), p. 1-2
Published online: 10 November 2023
Issue date: 10 November 2023
https://doi.org/10.5802/crmeca.229
Part of Special Issue: Physical Science in Microgravity within the Thematic Group
Fundamental and Applied Microgravity
Guest editors:Olga Budenkova (CNRS, Université Grenoble Alpes,Grenoble INP, SIMaP, 38000
Grenoble, France), Catherine Colin (IMFT, Université de Toulouse, CNRS, INPT, UPS et GDR
2799 Micropesanteur Fondamentale et Appliquée) and Guillaume Legros (ICARE, CNRS UPR
3021, Univ. Orléans et GDR 2799 Micropesanteur Fondamentale et Appliquée)
This article is licensed under the
Creative Commons Attribution 4.0 International License.
http://creativecommons.org/licenses/by/4.0/
Les Comptes Rendus. Mécanique sont membres du
Centre Mersenne pour l’édition scientifique ouverte
www.centre-mersenne.org
e-ISSN : 1873-7234
Comptes Rendus
Mécanique
2023, Vol. 351, Special Issue S2, p. 1-2
https://doi.org/10.5802/crmeca.229
Physical Science in Microgravity within the Thematic Group Fundamental and
Applied Microgravity / Sciences physiques en microgravité au sein du GDR
Micropesanteur Fondamentale et Appliquée
Foreword
Catherine Colin ,a and Guillaume Legros ,b
a IMFT, Allée Camille Soula, 31400 Toulouse, France
b CNRS-ICARE / Univ. Orléans, 1C Avenue de la Recherche Scientifique,
45071 Orléans Cedex 2, France
Published online: 10 November 2023, Issue date: 10 November 2023
As the editors of this special issue, we are delighted to introduce a selection of recent achieve-
ments associated with the French Research Network (Groupement de Recherche) on Fundamen-
tal and Applied Microgravity (GdR CNES/CNRS 2799). Last year marked the 30th anniversary of
this group, making it the longest-standing GdR accredited by the Centre National de la Recherche
Scientifique (CNRS). To open the 4th decade of our group, the Comptes-Rendus Mécanique de
l’Académie des Sciences offered the invigorating opportunity of this special issue.
Over the past 30 years, a dedicated French aircraft has played a crucial role in evaluating
theoretical and numerical investigations through experimental work conducted during parabolic
flights to simulate microgravity conditions. From the initial Caravelle in the 90’s to the current
Airbus A310, three airplanes were specifically equipped to be full-time dedicated to parabolic
flights. As highlighted in the first paper of this special issue, these facilities located on the French
ground show—among others—the unfailing support of the French Space Agency (CNES) which
we celebrate here.
Many processes are affected by gravity, and our understanding may be blurred by some grav-
itational effects. As an appealing illustration, the cover page displays a sequence of frames cap-
tured by a fast camera imaging the onset of an instability that propagates over the initially smooth
sheet of an expanding premixed spherical flame. For sure, the directional feature of buoyancy
makes it a serious trigger leading to the onset. So what if this trigger vanishes? Throughout a wide
range of fields related to mechanics, the present issue compiles recent advances that pave the
way to further understanding of fundamental processes, such as phase change or complex flows
in the absence of gravity.
In the coming decade, space exploration that is clearly ambitioned by the major space agen-
cies today also pushes new perspectives into our group. For this reason, our community now
contributes at an international level to projects aiming at spacecraft safety or life sustainability.
Papers related to fire safety or plant growth illustrate here these contributions.
Beyond these crucial issues, we also intend to celebrate a human adventure that a few gener-
ations of scientists strongly committed to. With this respect, we are deeply grateful to Christophe
Delaroche, who retired one year ago after years serving as the Head of the Physical Sciences in
ISSN (electronic) : 1873-7234 https://comptes-rendus.academie-sciences.fr/mecanique/
2 Catherine Colin and Guillaume Legros
microgravity Department at CNES. We also express a moved homage to our colleague Profes-
sor Pierre Haldenwang who passed away two years ago after serving two terms as president of
our group. We are convinced that Pierre’s inspiring spirit will continue to guide our work for a
long time. At the very least, the birth of our brand new website echoes this will:
https://gdr-mfa.fr/
Catherine Colin
Director of French Research Network on
Fundamental and Applied Microgravity
France
colin@imft.fr
Guillaume Legros
Deputy director of French Research Network on
Fundamental and Applied Microgravity
France
guillaume.legros@cnrs-orleans.fr


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L’approche variationnelle de la rupture : un exemple de collaboration fructueuse entre mécaniciens et mathématiciens