Sökning: "Dan Henningson"
Visar resultat 6 - 10 av 51 avhandlingar innehållade orden Dan Henningson.
6. Optimal disturbances in boundary layer flows
Sammanfattning : .... LÄS MER
7. Receptivity, Stability and Sensitivity analysis of two- and three-dimensional flows
Sammanfattning : This work deals with various aspects of boundary-layer stability. Modal and non-modal approaches are first used in the study of the global stability of a jet in crossflow. LÄS MER
8. Feedback and adjoint based control of boundary layer flows
Sammanfattning : Linear and nonlinear optimal control have been investigated in transitional channel and boundary layer .ows. The flow phenomena that we study are governed by the incompressible Navier–Stokes equations and the main aim with the control is to prevent transition from laminar to turbulent flows. LÄS MER
9. Stability and transition on wind turbine blades
Sammanfattning : Transition on wind turbine blades is a highly complex phenomenon due to the myriad effects influencing the process. This thesis studies some of them, namely free-stream turbulence (FST), rotation, and three-dimensionality. The investigations employ large eddy simulations (LES) with and without (implicit or wall-resolved LES) a subgrid-scale model. LÄS MER
10. Active Control and Reduced-Order Modeling of Transition in Shear Flows
Sammanfattning : In this thesis direct numerical simulation is used to investigate the possibilityto delay the transition from laminar to turbulent in boundary layer flows.Furthermore, modal analysis is used to reveal the coherent structures in highdimensional dynamical systems arising in the flow problems. LÄS MER