Welcome to the 22nd edition of the International Couette Taylor Workshop (ICTW23), to be held in Barcelona (28th-30th June 2023), hosted by UPC. In this edition, we celebrate the centennial of the publication of G.I. Taylor's paper entitled 'Stability of a Viscous Liquid contained between Two Rotating Cylinders', Phil. Trans. Roy. Soc. A, 223 (1923). Over a century, this paper has been a cornerstone work on which hydrodynamic stability theory has been developed.

Following the structure of former editions of the ICTW23, the conference will be organized as a series of selected key-note talks, oral and poster presentations, covering experimental, theoretical and computational investigations on hydrodynamic instabilities. The scope of the conference will include (among other topics):

• Taylor-Couette flows
• Rayleigh-Bénard instabilities (thermal buoyancy, binary mixtures, etc.)
• Rayleigh-Taylor and Dean instabilities
• Instabilities in wall-bounded shear and boundary layer flows
• Stratified flows
• Coherent flow structures
• Geophysical and atmospheric flow instabilities
• MHD flows

We very much look forward to seeing you in Barcelona next year!

Selected papers from the previous 21st ICTW, published in March and May 2023 issues of the Philosophical Transactions of the Royal Society