- document
-
Tal, E.A. (author)Recent developments in airframe design include the increasing application of modern lightweight materials. Airframe designs based on composite materials are able to provide sufficient structural strength at lower mass, but often have decreased structural rigidity. Flight vehicles with relatively flexible structures exhibit more prominent...master thesis 2015
- document
-
Werter, N.P.M. (author), De Breuker, R. (author), Abdalla, M.M. (author)Over the years, wings have become lighter and more flexible, making them more prone to aeroelastic effects. Thus, aeroelasticity in design becomes more important. In order to determine the response of an aircraft to, for example, a gust, an unsteady aerodynamic model is required to determine the dynamic loads. The three most-commonly used...conference paper 2015
- document
-
Ye, B. (author)This project focuses on extending the existing model for two-dimensional laminar boundary layers to turbulent boundary layers and more importantly to include the modeling of transition to turbulence in unsteady boundary layers. The existing models are extended and a new transition model for unsteady boundary layers is developed. Successful...master thesis 2015
- document
- Van der Plas, P.C.A. (author) master thesis 2014
- document
-
Schneiders, J.F.G. (author)Measurement rate limitations of time-resolved 3D-3C velocity measurements by tomographic PIV limit application of the technique to small measurement volumes and low speed flows (~10 m/s). To reduce the challenging repetition rate requirements historically set by the Nyquist criterion, in the present thesis work a novel method is proposed,...master thesis 2014
- document
-
Bordogna, G. (author)A common practice during the design of a sailing yacht is to assume an ideal environment. The wind is constant in intensity and direction and the sea is calm. In this situation, an equilibrium between the aerodynamic and hydrodynamic forces and moments can be found. The equations of equilibrium are thus solved to find the best setup (combination...master thesis 2013
- document
-
Blom, D.S. (author), Bijl, H. (author), Birken, P. (author), Meister, A. (author), Van Zuijlen, A.H. (author)This contribution compares the efficiency of Rosenbrock time integration schemes with ESDIRK schemes, applicable to unsteady flow and fluid-structure interaction simulations. Compared to non-linear ESDIRK schemes, the linear implicit Rosenbrock-Wanner schemes require subsequent solution of the same linear systems with different right hand sides....conference paper 2013
- document
-
Li, Z.R. (author)Cavitation erosion is one of the remarkable catastrophic consequences of cavitation. Predicting the cavitation aggressiveness quantitatively and predicting the most probable location of cavitation erosion are complex problems that currently still motivate an important amount of basic and applied research in the fields of hydrodynamics, physics...doctoral thesis 2012
- document
-
Lindeboom, R.C.J. (author), Sterenborg, J.J.H.M. (author), Simao Ferreira, C.J. (author)The unsteady flow conditions experienced by wind turbine blades lead to fatigue loads due to gusts, that increase the cost of energy. The decrease of the impact of these unsteady loads will most certainly lead to a decrease of the cost of energy. In order to alleviate unsteady loads the Smart Rotor Blade approach [2] applies spanwise-distributed...conference paper 2010
- document
-
Lucas, P. (author)Over the last four decades the increase in computer power and the advances in solver technology has resulted in an estimated reduction of 10 orders in magnitude to compute flow problems. However, to solve the instationairy Reynolds-averaged Navier-Stokes equations, even today, a massive amount of CPU time may be required. For example, to solve...doctoral thesis 2010
- document
-
Schreck, S. (author), Sant, T. (author), Micallef, D. (author)Wind turbine structures and components suffer excessive loads and premature failures when key aerodynamic phenomena are not well characterized, fail to be understood, or are inaccurately predicted. Turbine blade rotational augmentation remains incompletely characterized and understood, thus limiting robust prediction for design. Pertinent...conference paper 2010
- document
-
Souverein, L.J. (author)Shock wave boundary layer interactions (SWBLI) are a common phenomenon in transonic and supersonic flows. The presence of shock waves, induced by specific geometrical configurations, causes a rapid increase of the pressure, which can lead to flow separation. Examples of such interactions are found in amongst others rocket engine nozzles and on...doctoral thesis 2010
- document
-
Witteveen, J.A.S. (author), Bijl, H. (author)An efficient uncertainty quantification method for unsteady problems is presented in order to achieve a constant accuracy in time for a constant number of samples. The approach is applied to the aeroelastic problems of a transonic airfoil flutter system and the AGARD 445.6 wing benchmark with uncertainties in the flow and the structure.conference paper 2009
- document
-
Humble, R.A. (author)A fundamental experimental study is carried out to investigate the unsteady flow organization of an incident shock wave/turbulent boundary layer interaction at Mach 2.1. Planar and tomographic particle image velocimetry (PIV) are used in combination with data processing using the proper orthogonal decomposition (POD), complemented with hot-wire...doctoral thesis 2009
- document
- Witteveen, J.A.S. (author), Bijl, H. (author) conference paper 2008
- document
- Sterenborg, J.J.H.M. (author), van Zuijlen, A.H. (author), Bijl, H. (author) conference paper 2008
- document
-
Kreeft, J.J. (author)Multi-fluid flows are found in many applications in engineering and physics. Examples of these flows from engineering are water-air flows in ship hydrodynamics, exhaust-air flows behind rockets, gas-petrolea flows in upstream pipes of oilrigs, air-fuel bubble interaction flows in scramjets and many others. To gain better insight in the behavior...master thesis 2007
- document
-
Veryovkin, A.A. (author), Tsirkunov, Y.M. (author)The paper describes the results of computational simulation of an unsteady two-phase gas-particle flow in a hypersonic shock tunnel. The tunnel consists of a heated shock tube, a convergent-divergent nozzle linked up with the low-pressure chamber of the tube, a test section where a model is placed, and a exhaust chamber. In calculations, the...conference paper 2006
- document
-
Davidson, L. (author)The SAS model (Scale Adapted Simulation) was invented by Menter and co-workers. The idea behind the SST-SAS k-omega model is to add an additional production term -- the SAS term -- in the omega equation, which is sensitive to resolved (i.e. unsteady) fluctuations. When the flow equations resolve turbulence, the length scale based on velocity...conference paper 2006
- document
-
Vigneron, D. (author), Deliége, G. (author), Essers, J.A. (author)This paper presents a density-based finite volumes method for solving the unsteady Navier-Stokes equations on 3D unstructured grids. The second order Crank-Nicolson scheme is applied to perform the time integration. At each time step, the system of non linear equations is solved by means of a fully implicit dual time stepping method. An...conference paper 2006