Simon Pasche
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View article: Near-wall turbulence alteration with the transpiration-resistance model
Near-wall turbulence alteration with the transpiration-resistance model Open
A set of boundary conditions called the transpiration-resistance model (TRM) is investigated in altering near-wall turbulence. The TRM was proposed by Lacis et al. ( J. Fluid Mech. , vol. 884, 2020, p. A21) as a means of representing the n…
View article: Turbulence drag modification with the Transpiration-Resistance Model
Turbulence drag modification with the Transpiration-Resistance Model Open
A set of boundary conditions called the Transpiration-Resistance Model (TRM) are investigated in their ability to change the drag of turbulent flow by altering the near-wall conditions. The TRM has been previously proposed by Lacis et al. …
View article: Vortex impingement onto an axisymmetric obstacle – subcritical bifurcation to vortex breakdown
Vortex impingement onto an axisymmetric obstacle – subcritical bifurcation to vortex breakdown Open
View article: Optimal Control of Part Load Vortex Rope in Francis Turbines
Optimal Control of Part Load Vortex Rope in Francis Turbines Open
The mitigation of the precessing vortex core developing in the draft tube of Francis turbines operating under part load conditions is crucial to increase the operation flexibility of these hydraulic machines to balance the massive power pr…
View article: Predictive control of spiral vortex breakdown
Predictive control of spiral vortex breakdown Open
The predictive control of the self-sustained single spiral vortex breakdown mode is addressed in the three-dimensional flow geometry of Ruith et al. (2003) for a constant swirl number $S=1.095$ . Based on adjoint optimization algorithms, t…
View article: Dynamics and Optimal Control of Self-Sustained Instabilities in Laminar and Turbulent Swirling Flows: Application to the Part Load Vortex Rope in Francis Turbines
Dynamics and Optimal Control of Self-Sustained Instabilities in Laminar and Turbulent Swirling Flows: Application to the Part Load Vortex Rope in Francis Turbines Open
In 2050, the European commission plans to achieve actual energetic transition, which contributes in meeting the climate change challenges by moving away from the fossil fuels and by developing a competitive low-carbon economy. As a consequ…
View article: Part Load Vortex Rope as a Global Unstable Mode
Part Load Vortex Rope as a Global Unstable Mode Open
Renewable energy sources (RES) have reached 23.7% of the worldwide electrical generation production in 2015. The hydraulic energy contribution amounts to 16.6% and comes mainly form large-scale hydropower plants, where Francis turbines rep…