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Karimi, H. (author), Taheri, E.E. (author)
There are several methods for starting a complex mechanical system, for example a liquid propellant engine. One of common methods is the use of solid propellant gas generator that is named solid propellant starter. In this method, a solid propellant motor is used for gas generating and leading it towards power generation turbine. The turbine as...
conference paper 2006
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Kwakkel, M. (author), Gerritsma, M.I. (author)
In this work a new approach to time dependent problems in combination with the Least-Squares Spectral Element Method (LSQSEM) will be discussed. Various time-stepping formulations will be presented. These time-stepping formulations will be compared to the full space-time formulation. It will be shown that time-stepping formulations give accurate...
conference paper 2006
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Rolando, A. (author), D’'Uva, D. (author)
The development of new shapes in architecture has deeply influenced the current perception of the built environment. The analysis of the processes behind this evolution is, therefore, of great interest. At least two well known factors, influencing this development, may be pointed out: the great improvement of digital tools and the tendency...
conference paper 2013
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Bubble dynamics in turbulent flows has been extensively studied using the point-bubble approximation. But when the carrier flow varies on length scales smaller than the bubble size, this approximation is no longer appropriate and one needs to resolve all the scales present in the two-phase flow. 3D Direct Numerical Simulations of turbulent...
conference paper 2015
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This study conducts a multi-scale analysis on the drag reduction (DR) in the fluid flow diluted with the polymers. A mesoscopic description of ensemble of elastic dumbbells using Brownian dynamics (BDS) is connected to the macroscopic description for the solvent Newtonian fluid using DNS [1]. In Horiuti \etal [2], non-affinity in which the...
conference paper 2015
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We investigate the onset of chaotic reversals of thermal convection cell in a two–dimensional square cavity using direct numerical simulation. To our knowledge, the chaotic reversal motion at the lowest Rayleigh number is related to the unicellular motion in this system. As Rayleigh number increases, the two antisymmetric attractors, which arise...
conference paper 2015
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We investigated the rotation of non-spherical particles (rod-like and disk-like) in turbulent channel flow with focus on inertial effects. A direct numerical simulation (DNS) with an Eulerian-Lagrangian approach was performed. A wide range of particle aspect ratios, λ, ranging from 0.01 to 50 were considered for Stokes numbers St equal to 1 and...
conference paper 2015
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Nayak, A.R. (author), Li, C. (author), Kiani, B. (author), Katz, J. (author)
A submersible PIV system has been deployed to characterize mean flow and turbulence in the inner part of the coastal ocean bottom boundary layer (BBL), and their interaction with the bottom roughness. Five large datasets, each consisting of ~20,000 velocity distributions, are chosen for analysis to represent flow conditions spanning a range of...
conference paper 2013
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Hoogendoorn, G. (author)
Papers workshops. Rural geographies have changed significantly over the past half century. These reconfigured geographies are increasingly denoted as evolving from a productivist to a post-productivist state and second home development has increasingly been implicated as contributing to such change. This paper considers this post-productivist...
conference paper 2008
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Van Kempen, R. (author)
The existence of deprived urban areas triggers many governments to change the physical and social structure of these areas. Sometimes policies are meant to change the area itself, in other cases the policies are meant to improve the situation of the residents. Urban restructuring policies change the deprived urban areas, usually because low-rent...
conference paper 2010
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Li, A. (author), Norinaga, K. (author), Deutschmann, O. (author)
Numerical simulation of materials synthesis based on detailed models for the chemical kinetics and transport processes is expected to support development and optimization of production processes. Exemplarily, chemical vapor deposition and infiltration of pyrolytic carbon for the production of carbon fiber reinforced carbon is studied by recently...
conference paper 2006
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Xu, M. (author), Stefani, F. (author), Gerbeth, G. (author)
The conventional magnetic induction equation that governs hydromagnetic dynamo action is transformed to an equivalent integral equation system. An advantage of this approach is that the computational domain is restricted to the region occupied by the electrically conducting fluid and to its boundary. This integral equation approach is applied to...
conference paper 2006
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Schwamborn, D. (author), Gerhold, T. (author), Heinrich, R. (author)
This paper gives an overview of the TAU-Code, DLR's system for complex flow simulations on unstructured hybrid grids. Starting from a short description of the system and its components, e.g. mesh adaptation or grid deformation, its basic capabilities are discussed. Thereafter recent and on-going developments are presented, such as the adjoint...
conference paper 2006
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Wiktor, V. (author), Sangadji, S. (author), Jonkers, H.M. (author), Schlangen, H.E.J.G. (author)
Bacterially induced calcium carbonate precipitation has received considerable attention for its potential application in enforcing or repairing construction material. The mechanism of bacterially mediated calcite precipitation in those studies is primarily based on the enzymatic hydrolysis of urea. Besides calcite precipitation, this reaction...
conference paper 2013
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Avidar, O. (author)
Through an examination of three case studies, this paper reviews the complexities of the technological encounter in various settings in Africa in the colonial era. Technology played a role in fostering many colonial conflicts, but also enabled many connections, collaborations and opportunities. Together with its destructive role, it was also...
conference paper 2015
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A modification of the Townsend-Perry attached eddy model is derived in order to reproduce a more realistic variation of the integral length scale. A new wavenumber range is introduced to the model at wavenumbers smaller than the Townsend-Perry k^(-1) spectrum. This necessary addition can also account for the high Reynolds number outer peak of...
conference paper 2015
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Homsi, P. (author)
conference paper 2006
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Erdine, E. (author)
The paper argues that the tower needs to respond to its environment by changing from a closed building typology towards a heterogeneous, differentiated open system that can adapt to the changing conditions within and around it. This argument is supported by focusing on the analogies and principles of specific biological examples in order to...
conference paper 2013
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Küttler, U. (author), Förster, C. (author), Wall, W.A. (author)
Many popular partitioned approaches to fluid-structure interaction (FSI) problems fail to work for an interesting subset of problems if highly deformable structures are interacting with incompressible flows. This is particularly true for coupling approaches based on Dirichlet-Neumann substructuring, both for weak and strong coupling schemes. The...
conference paper 2006
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Lyakhova, K. (author), Esteves, A.C.C. (author), De With, G. (author)
For many current engineering applications the performance of materials depends strongly on the surface properties of the top layer. In many cases a hydrophobic/superphydrophobic top surface is desired (for example for easy-toclean/ self-cleaning applications). The durability of coatings will be substantially extended if the layer which provides...
conference paper 2013
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