Mid Term Review

Two-dimensional turbulent flow inside an open channel

Mr Mahdi Davoodianidalik

Two-dimensional (2D) turbulence is far more ubiquitous than it was originally expected. 2D turbulence supports an inverse energy cascade that transfers energy from small to larger scales and has a remarkable ability to self-organise in the presence of boundaries. It has recently been found that Faraday waves generate horizontal turbulent motion at the water surface called Faraday wave drive turbulence (FWT). Recent studies on FWT resulted in the discovery of the coherent bundle structure underlying turbulent flows.

This midterm review presents the status of ongoing experiments probing the effect of boundaries on FWT. Experiments conducted on an open channel with different width to length ratios and flow behaviour is studied inside the channel. Self-organisation in the shape of an array of counter-rotating cells appears when the channel becomes narrow. The attraction force exerted on the channel walls is measured using the optical fibre probe. An equation is proposed between the energy of the flow and the force. Further experiments will investigate the effect of boundary shapes on 2D turbulence self-organisation.

Date & time

Fri 28 Feb 2020, 10.30–11.30am



Leonard Huxley Teaching Room (H4.20)


Members of RSPE welcome