Global ETD Search
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Showing 1 to 10 of 10 for “"global modes"”.
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Actuator selection and placement for linear feedback control of compressible flows
… information from the forward and adjoint global modes of the baseflow obtained from direct/large eddy simulations. The baseflow can be an equilibrium (steady-state) or a time-averaged solution of the compressible Navier Stokes equations. The method uses structural sensitivity arguments to …
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Sensitivity analysis of low-density jets and flames
… is used to calculate direct-linear and adjoint global modes for axisymmetric low-density jets and lifted jet diffusion flames. The adjoint global modes provide a map of the most sensitive locations to open-loop external forcing and heating. For the jet flows considered here, the most sensitive …
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Global stability and control of swirling jets and flames
… hydrodynamic oscillations, also known as global hydrodynamic instability. Direct numerical simulation (DNS) of the Navier--Stokes equations in the low Mach number limit is used to obtain a steady base flow, and the most unstable direct and adjoint global modes. These are combined, using a …
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The dynamics of the outer region of wall-bounded turbulence : La dinámica de la zona exterior en la turbulencia de pared
… are modified by the wall forcing. They are the global modes identified in previous works, corresponding to structures highly correlated from the wall to the center of the channel. Our results indicate that their intensity does not scale with the friction velocity, nor with the centerline …
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A mode-based metric for evaluating global climate models
… the extent to which a model is able to simulate global modes of climate variability (modes, e.g.: ENSO) evident in the observed climate data. Modes are one aspect of the climate that can be evaluated and are fundamental to model skill. Therefore their credible simulation is a necessary (but not …
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Dynamical instabilities in disc-planet interactions
… this. When applied to disc-planet systems, modes with small azimuthal wavelengths are preferred with increasing disc selfgravity. This is in agreement the observation that more vortices develop in simulations with increasing disc mass. Vortices in more massive discs also resist merging. I …
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Active Dynamic Analysis and Vibration Control of Gossamer Structures Using Smart Materials
… structure's skin rather than excitation of the global (entire structure's) modes. Unfortunately, the global modes are necessary for model parameter verification. The motivation of this research is to find an effective and repeatable methodology for obtaining the dynamic response characteristics …
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Magnetic fields and stellar oscillations
… interference of these waves generates global modes of oscillation. With sufficiently precise photometry, stellar oscillations can be detected through the periodic variations they induce in a star's brightness. Understanding the connection between the internal structure of a star and the …
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Modeling of shock boundary layer interactions and stability analysis using particle approaches
… a com- bination of DSMC calculations, linear global instability analysis and momentum potential theory (MPT). Close to steady state linear analysis reveals the spatial structure of the underlying temporally stable global modes. Application of the MPT (valid for both linear and nonlinear …
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Development of an Accurate and Efficient Method for Normal Mode Analysis in Extended Molecular Systems: the Mobile Block Hessian Method
… consists of a number of close-lying normal modes, which result from normal mode analysis (NMA). This is the diagonalization of the full mass-weighted molecular Hessian matrix, which contains the second derivatives of the total potential energy with respect to Cartesian nuclear coordinates, …