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Ontario Tech acknowledges the lands and people of the Mississaugas of Scugog Island First Nation.

We are thankful to be welcome on these lands in friendship. The lands we are situated on are covered by the Williams Treaties and are the traditional territory of the Mississaugas, a branch of the greater Anishinaabeg Nation, including Algonquin, Ojibway, Odawa and Pottawatomi. These lands remain home to many Indigenous nations and peoples.

We acknowledge this land out of respect for the Indigenous nations who have cared for Turtle Island, also called North America, from before the arrival of settler peoples until this day. Most importantly, we acknowledge that the history of these lands has been tainted by poor treatment and a lack of friendship with the First Nations who call them home.

This history is something we are all affected by because we are all treaty people in Canada. We all have a shared history to reflect on, and each of us is affected by this history in different ways. Our past defines our present, but if we move forward as friends and allies, then it does not have to define our future.

Learn more about Indigenous Education and Cultural Services

February 10,2016

Speaker: Dr. Yohann Duguet, LIMSI-CNRS, Universite Paris-Sud
Title: Hysteretic turbulence in pipes and channels
Abstract: The flow of usual gas or liquids inside circular pipes and plane channels can occur in either a laminar or a turbulent way, with dramatic implications on the energy dissipated by the whole system.  Close to the onset of turbulence investigated by Reynolds, these two regimes are known to compete with each other in space, giving rise to fluctuating patterns of turbulence inside a laminar flow. Besides the turbulent regime happens to be metastable and can locally disappear in favour of the stable laminar regime. In this talk I will illustrate this phenomenon by reviewing experimental and numerical approaches, going from the 'local' scales (involving a dynamical systems description of the vortical dynamics) to the macroscopic ones (using a statistical description in extended domains), via the 'mesoscale' description of the dynamics of localised turbulent patches.