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van der Wilt, Pieter (author)The traditional Eulerian view of biomass in bioprocess modelling results in issues when modelling large-scale bioreactors in which heterogeneous conditions are common. As the field increasingly moves from “scale-up” to “scale-down” philosophy, in which such heterogeneities are included from the start of process design, accurate modelling of the...bachelor thesis 2022
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Kortleven, M. (author)In this research computational fluid dynamics (CFD) is used to model a vertical axis wind turbine. Well known turbulence models | i.e. the k-epsilon and k-omega SST model | are used and compared in their performance against each other and a set of experimental data. The formal research question is "What models are available for the simulation of...bachelor thesis 2016
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Fuentes Monjas, B. (author), Head, A.J. (author), de Servi, C.M. (author), Pini, M. (author)This work assessed the accuracy of the SU2 flow solver in predicting the isentropic expansion of Siloxane MM through the converging-diverging nozzle test section of the Organic Rankine Cycle Hybrid Integrated Device (ORCHID) [9]. The expansion is modeled using compressible Euler equations, and assuming adiabatic flow, while the fluid...book chapter 2023
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Steijl, R. (author), Barakos, G.N. (author), Badcock, K.J. (author)The focus of this paper is on the parallel computing aspects of multi-physics CFD methods and the implications for the design of a CFD framework encompassing mesh-based and particle-based approaches. In the first part of the paper, the shared-memory parallelisation of a multi-block, structured CFD is described and the parallel performance of...conference paper 2006
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Weinman, K.A. (author), Van der Ven, H. (author), Mockett, C.R. (author), Knopp, T.A. (author), Kok, J.C. (author), Perrin, R.T.E. (author), Thiele, F.H. (author)A systematic grid convergence study is conducted for the Detached-Eddy Simulation (DES) of the massively separated flow around a NACA0021 airfoil at high angle of attack. In order to study the convergence characteristics of DES/LES problems, velocity fields using a series of grids must be generated that demonstrate sufficient dynamic similarity...conference paper 2006
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Shapiro, E. (author), Drikakis, D. (author), Gargiuli, J. (author), Vadgama, P. (author)Dual-fluid flows are utilised extensively in microfluidics applications. A problem of particular interest isthe precise positioning of the contact discontinuity between the carrier fluids. The paper presents a computational study of the interface positioning in xylene/water flows used in polymer membrane fabrication in microfluidics. Both...conference paper 2006
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Turkel, E. (author), Vatsa, V.N. (author), Swanson, R.C. (author), Rossow, C.C. (author)We consider a multistage algorithm to advance in pseudo-time to find a steady state solution for the compressible Navier-Stokes equations. The rate of convergence to the steady state is improved by using an implicit preconditioner to approximate the numerical scheme. This properly addresses the stiffness in the discrete equations associated with...conference paper 2006
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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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Freitas, G.C.S. (author), Peixoto, F.C. (author), Vianna, A.S. (author)Thermal batteries are primary disposable systems specially designed to develop a high energy density in during a short period. Differently from the classical electrochemical systems, the electrolyte of such batteries is solid at room temperature, which make them inert until they are heated to high temperatures (around 500ºC), when the...conference paper 2006
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Sandberg, R.D. (author), Sandham, N.D. (author)This paper presents two-dimensional direct numerical simulations (DNS) of noise generated at trailing edges (TE) with zero thickness. The simulations are conducted specifying either no-slip or slip walls in order to investigate viscous effects. In both cases, small amplitude disturbances are introduced close to the inflow boundary that serve as...conference paper 2006
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Sandberg, R.D. (author), Jones, L.E. (author), Sandham, N.D. (author)This paper presents a non-reflecting boundary condition that significantly reduces the spurious pressure oscillations that are produced when vortical structures in a compressible flow cross the computational farfield boundaries. The method is based on commonly used characteristic boundary conditions. Here, incoming characteristics are ramped to...conference paper 2006
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Horsten, B.J.C. (author), Veldhuis, L.L.M. (author)Renewed interest in propeller propulsion on aircraft configurations combined with higher propeller loads lead to the question how the effects of the propulsion on model support disturbances should be accounted for. In this paper, the determination of engine power effects on support interference of sting-mounted models is demonstrated by a...conference paper 2009
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Turunen-Saaresti, T. (author), Tang, J. (author), Larjola, J. (author)Polynomial functions are generated to describe real gas properties in computational fluid dynamics (CFD). Two-variable relative least square fitting is applied. In this way the real gas model can be generated fast and easily and the computational time requested is small and precision of the function can be easily adjusted. In this paper this...conference paper 2006
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Florentie, L. (author), Van Zuijlen, A.H. (author), Bijl, H. (author)This paper is the starting point for the development of a multi-fidelity modeling approach for vortex generators (VG) arrays, where a fully resolved VG model will be coupled with an approximate model in order to improve both accuracy and flexibility without increasing the required computational cost. As a first step thereto, an analysis of the...conference paper 2014
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Othmer, C. (author), Kaminski, T. (author), Giering, R. (author)Topology optimization of fluid dynamical systems is still in its infancy, with its first academic realizations dating back to as late as three years ago. In this paper, we present two approaches to fluid dynamic topology optimization that are based on potential flows and adjoint states, respectively. Special emphasis is paid to the computation...conference paper 2006
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- Den Hartog, J.P. (author), Koutamanis, A. (author) conference paper 2000
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Cebula, A. (author), Sobota, T. (author)Local heat transfer from a cylinder in tube bank has been extensively studied. In many applications such as design of heat exchangers, detailed information regarding the circumferential and longitudinal variation of heat transfer to a cylinder is required. There are many different methods for measuring local heat transfer like techniques using...conference paper 2006
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- van Rhee, C. (author) conference paper 2010
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Ono, C. (author), Furusawa, H. (author), Tamura, Y. (author)In this paper, a simple analysis method for flow simulations around a motor cycle is discussed based on CFD. In the practical CFD, most of the efforts are wasted for grid generations. The typical two types of grid are body-fitted grid and Cartesian grid. Body-fitted grid was often used for the flow calculation around the vehicle until today....conference paper 2006
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Mirzaei, M. (author), Roshanian, J. (author), Nasrin Hosseini, S. (author)A gradient based method is presented for optimization of an airfoil configuration. The flow is governed by two dimensional, compressible Euler equations. A finite volume code based on unstructured grid is developed to solve the equations. The procedure is carried out for optimizing an airfoil with initial configuration of NACA 0012. The...conference paper 2006