Martinuzzi, RobertHu, YaopingAgrey, Kaden2021-08-202021-08-202021-08Agrey, K. (2021). Coherent dynamics and energetics in thin flat plate wakes (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.http://hdl.handle.net/1880/113754The dynamics and energetics of two mean two-dimensional wakes behind a flow-normal thin flat plate, induced by inclusion and exclusion of end plates, are studied. Both wakes are characterized by quasi-periodic vortex shedding but differ in mean topology and typical wake characteristics, such as mean base pressure and recirculation length. Energetically optimal proper orthogonal decomposition modes are used to approximate the coherent motion and thus triply decompose the velocity field into a mean, coherent, and residual field. This is utilized to obtain a dynamic characterization of the wakes and to study the large scale coherent structures and their energetic exchanges with other scales of motion. From this, a slow-varying base flow and lateral shear layer flapping are shown to influence the shedding dynamics differently in each wake. These differences in the mean field and coherent dynamics are related to wake turbulence levels and vortex deformation, and thus are at the beginning of the energy cascade and the energy transfer process related to the wake turbulence levels.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.Fluid DynamicsFluid MechanicsTurbulenceBluff-body WakesLow-order ModelingVortex SheddingLow-frequency Wake DynamicsEngineering--Mechanicalmaster thesis10.11575/PRISM/39114