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 Liquid media (1)
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 Hypersonic flow (1)
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Articles 1  5 of 5
FullText Articles in Mechanical Engineering
On Shock Capturing For Liquid And Gas Media, Tze Jang Chen
On Shock Capturing For Liquid And Gas Media, Tze Jang Chen
Mathematics & Statistics Theses & Dissertations
The numerical investigation of shock phenomena in gas or liquid media where a specifying relation for internal energy is absent poses special problems. Classically, for gas dynamics the usual procedure is to employ a splitting scheme to remove the source terms from the Euler equations, then upwind biased shock capturing algorithms are built around the Riemann problem for the system which remains. However, in the case where the Euler equations are formulated in the term of total enthalpy, a technical difficulty associated with equation splitting forces a pressure time derivative to be treated as a source term. This makes it ...
Integrated System Identification And Adaptive State Estimation For Control Of Flexible Space Structures, ChungWen Chen
Integrated System Identification And Adaptive State Estimation For Control Of Flexible Space Structures, ChungWen Chen
Mechanical & Aerospace Engineering Theses & Dissertations
Accurate state information is crucial for control of flexible space structures in which the state feedback strategy is used. The performance of a state estimator relies on accurate knowledge about both the system and its disturbances, which are represented by system model and noise covariances respectively. For flexible space structures, due to their great flexibility, obtaining good models from ground testing is not possible. In addition, the characteristics of the systems in operation may vary due to temperature gradient, reorientation, and deterioration of material, etc. Moreover, the disturbances during operation are usually not known. Therefore, adaptive methods for system identification ...
LargeAmplitude Finite Element Flutter Analysis Of Composite Panels In Hypersonic Flow, Carl E. Gray Jr.
LargeAmplitude Finite Element Flutter Analysis Of Composite Panels In Hypersonic Flow, Carl E. Gray Jr.
Mechanical & Aerospace Engineering Theses & Dissertations
A finiteelement approach is presented for determining the nonlinear flutter characteristics of twodimensional isotropic and threedimensional composite laminated thin panels using the thirdorderpiston, transverse loading, aerodynamic theory. The unsteady, hypersonic, aerodynamic theory and the von Karman large deflection plate theory are used to formulate the aeroelastic problem. Nonlinear flutter analyses are performed to assess the influence of the higherorder aerodynamic theory on the structure's limitcycle amplitude and the dynamic pressure of the flow velocity. A solution procedure is presented to solve the nonlinear panel flutter and largeamplitude free vibration finite element equations. This procedure is a linearized updated mode ...
Numerical Modeling Of Flame LiftOff Phenomenon And Calculation Of Thermal Loads On A Methane Fuel Injector With Complex Geometry, Taj O. Mohieldin
Numerical Modeling Of Flame LiftOff Phenomenon And Calculation Of Thermal Loads On A Methane Fuel Injector With Complex Geometry, Taj O. Mohieldin
Mechanical & Aerospace Engineering Theses & Dissertations
A numerical study has been conducted to analyze a fuel injector with three inline cylinder geometry that has been adopted as a model for investigating the combustion phenomenon in the 8Foot High Temperature Tunnel (HTT) combustor at the NASA Langley Research Center. The primary objective here is to analyze the flame liftoff phenomenon in the three cylinder fuel injector geometry in twodimensions. The fluid mechanics model used in the analysis includes timeaveraged NavierStokes equations that are employed in conjunction with a twoequation k$\epsilon$ model for predicting the effects of turbulence. Calculations were performed with three chemistry models, namely fast ...
Micromechanics Of Granular Materials And Its Relation To Wave Velocity, Tarun K. Agarwal
Micromechanics Of Granular Materials And Its Relation To Wave Velocity, Tarun K. Agarwal
Civil & Environmental Engineering Theses & Dissertations
The macro characters of the granular materials depend upon micromechanical parameters such as the void ratio, particle shape, contact force distribution, and initial state of the fabric of the assembly. Since it is difficult to evaluate these internal parameters from laboratory experiments, a macro measure is desired which depends directly on these internal parameters. One such measure has been shown to be dynamic shear modulus but it was incomplete in predicting directional changes in the internal parameters. Therefore, it is hypothesized here that the complete elastic moduli matrix will have more direct information about the internal parameters, especially the dynamic ...