Numerical simulation and modelling of non-equilibrium flows in hydro-power applications

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This proposal addresses a problem of critical importance for the hydroelectric power industry, the development**of accurate models for the prediction of the flow over rough surfaces, in turbulence far from equilibrium. Two**cases will be considered: a separating flow in a curved duct, and the flow in a rough channel undergoing system**rotation. We will use direct and large-eddy simulations (DNS and LES) of turbulence to validate the models**for the Reynolds-Averaged Navier-Stokes equations that are commonly used in industry. Although the DNS**and LES will be performed at Reynolds numbers lower than those in actual applications, the LES should be**able to achieve the fully rough regime that allows to extend the simulation results to practical applications. The**proposed research will benefit Canada in several ways: first, it will train one PhD student and one PDF in the**computational sciences; secondly, it will generate fundamental knowledge on the physics of rough-wall**boundary layers in the presence of swirl, curvature, system rotation and separation. Finally, it will develop**prediction models that will benefit the power generation industry (and may be extended to other areas of**application), and can potentially result in significant efficiency increases and financial savings.