Have you been drinking Guinness for St Patrick’s?


Numerical simulations of bubbly flows for the pint and anti-pint.. The curves show the streamlines for the bubbles, the colour shows the void fraction f. The snapshots displayed correspond to t = 4 s.

Yesterday was St Patrick’s day, celebrated world wide, probably with a pint of Guinness. Perhaps while sipping down a pint you may have wondered why do bubbles in Guinness sink? Here is one-of-a kind paper that discusses just this! They concluded that the flow in a glass of stout depends on the shape of the glass. If it narrows downwards (as the traditional stout glass, the pint, does), the flow is directed downwards near the wall and upwards in the interior and sinking bubbles will be observed. If the container widens downwards, the flow is opposite to that described above and only rising bubbles will be seen (

Read it all here:

Matthew Agius is a recent PhD graduate from the Dublin Institute for Advanced Studies in Ireland and is now doing research at the University of Southampton (National Oceanography Centre). His research focuses on the dynamics of the lithosphere beneath Tibet, the Central Mediterranean, and the Pacific Ocean. Matthew’s role as a young scientist representative is to promote the efforts done by young researchers and to engage in discussions that concern seismology students. You can reach Matthew via e-mail at

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