Energy, vorticity and enstrophy conserving mimetic spectral method for the Euler equation

The behaviour of an inviscid, constant density fluid on which no body forces act, may be modelled by the two-dimensional incompressible Euler equations, a non-linear system of partial differential equations. If a fluid whose behaviour is described by these equations, is confined to a space where no fluid flows in or out, the kinetic energy,...

Aeroacoustic Investigation of Beveled Trailing Edges by High-Speed Particle Image Velocimetry

The aerodynamic noise generated by trailing edge of aircraft wings at take-o_ and approach con_guration continues to be a critical factor in the future development of aviation. Trailing edge noise is also a serious concern for wind turbines, marine propellers, helicopter rotors, axial and centrifugal turbines and compressors. A fundamental...

Embedded Boundary Method: For Aerospace Problems

The application of Computational Fluid Dynamics to model and simulate flows around flexible and moving objects has grown in the last decades fueled by new technological challenges in particular in the aerospace engineering field because of the introduction of highly deformable materials and complex moving systems. Existing body-fitted mesh...

Slot Suction of the Turbulent Boundary Layer: An Experimental Study

This study examines the effects of slot suction on the mean characteristics of a two-dimensional turbulent boundary layer. Previous studies on this subject have mainly focused on low Reynolds number boundary layers (i.e. Re_ B 2,000). Furthermore, numerical tools are often not able to accurately predict the effects of slot suction. To grasp the...

Mimetic Discretizations with B-Splines: On the Construction of a Discrete Hodge Star Operator

This thesis introduces a higher-order numerical method for elliptic boundary value problems. The discretization method belongs to the class of mimetic discretizations, which translate as many of properties of the continuous problem to the discrete system, aiming to improve accuracy and reliability. The novelty lies in the application of B...

Rosenbrock time integration combined with Krylov subspace enrichment for unsteady flow simulations: Unsteady aerodynamics

The GMRES algorithm has been discussed to solve the linear system Ax = b for application in a flow solver. Besides the conventional GMRES algorithm, several approaches are discussed which supposedly reduce the computational costs of the method, and reduce the number of iterations needed to satisfy the convergence criteria. GMRES is one of the...

An Adjoint Approach to Error Estimation for Mimetic Spectral Element Method

Numerical investigation of an upper airway in a patient suffering from stridor: A fluid-structure-acoustic interaction simulation in OpenFOAM R

In this master thesis, the numerical investigation of an upper airway in a patient suffering from stridor is investigated using a fluid-structure-acoustic interaction simulation in OpenFOAMR . The geometry of an upper airway model is very difficult, leading to various cross sections and a large spectrum of ow phenomena. Many ow forms were...

Wake Bursting Effects of a Drooped Spoiler Panel in a Wing-Flap Configuration: An Experimental Investigation

Nowadays, the evolution of multi-element airfoils presents a change of route, towards a "circular arch", in order to achieve the ultimate lift force [9]. Particularly, for wing-ap configurations, the enhancement of high lift performance, is of great interest and growing research at Delft University of Technology. Typically, the main approach...

Mimetic Mesh Refinement: A mortar element approach

This thesis aims to introduce mesh refinement into the Mimetic Spectral Element Method (MSEM). The concept of mimetic discretizations is to mimic the properties of continuous Partial Differential Equations (PDEs) discretely. In many discretization methods information is lost in the actual discretization step which is detrimental to the physical...

Flow Separation Control over a Wing-Flap Model: Analysis of flap leading edge applications

Nowadays, the development of multi-element airfoils show a progression towards a “circular arc” to attain a maximum lift force. The improvement of the high lift performance of specifically a wing-flap combination is an ongoing research at Delft University of Technology. Generally, a higher lift force can be created by deflecting the flap to...

Passive Flow Separation Control on an Airfoil-Flap Model: The Effect of Cylinders and Vortex Generators

In the on-going search for improvements in high lift device performance, the field of flow separation control has seen explosive growth in recent years. This is due to a continuously improved understanding of fluid mechanics, the development in experimental and computational techniques and the variety of flow control mechanisms existing today....

Characterization of the flow-field in circular subsonic impinging jets: Investigation of surface pressure fluctuations and far-field noise emissions through pressure sensor measurements

Impinging jets are relevant ow configurations in many technological developments. For example, on some short take-off and landing aircraft the high speed exhaust from the jet engine is deflected by direct impingement on the aps to create extra lift during take-off. Fatigue due to excessive dynamic loading on the aps and high levels of noise...