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Rubino, A. (author), Pini, M. (author), Colonna di Paliano, Piero (author)
Currently, turbomachinery design optimization methodologies are mainly restricted to steady state approaches, due to the high computational cost associated with time-accurate shape optimization algorithms. However, the possibility to include unsteady effects in turbomachinery optimization can significantly increase the level of accuracy of...
conference paper 2017
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Pini, M. (author), de Servi, C.M. (author), Burigana, M. (author), Bahamonde Noriega, Juan S. (author), Rubino, A. (author), Vitale, S. (author), Colonna di Paliano, Piero (author)
, are receiving recognition for distributed and mobile energy generation applications. For this type of power plants, it is customary to adopt a radial-turbine as prime mover, essentially for their ability to cope with very large volumetric...
conference paper 2017
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Veldman, AEP (author), Luppes, R (author), van der Plas, P (author), van der Heiden, HJL (author), Duz, B. (author), Seubers, H. (author), Helder, J. (author), Bunnik, T (author), Huijsmans, R.H.M. (author)
During the development of the ComFLOW simulation method many challenges have to be tackled concerning the flow modelling and the numerical solution algorithm. Examples hereof are wave propagation, absorbing boundary conditions, fluid–solid body interaction, turbulence modeling and numerical efficiency. Some of these challenges will be discussed...
conference paper 2016
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Denies, L. (author), Zandbergen, B.T.C. (author), Natale, P. (author), Ricci, D. (author), Invigorito, M. (author)
Methane is a promising propellant for liquid rocket engines. As a regenerative coolant, it would be close to its critical point, complicating cooling analysis. This study encompasses the development and validation of a new, open-source computational fluid dynamics (CFD) method for analysis of methane cooling channels. Validation with...
conference paper 2016
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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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Toxopeus, S.L. (author)
In the SIMMAN 2008 workshop, the capability of CFD tools to predict the flow around manoeuvring ships has been investigated. It was decided to continue this effort but to extend the work to the flow around ships in shallow water. In this paper, CFD calculations for the KLVCC2 are presented. The aim of the study is to verify and validate the...
conference paper 2011
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van Rhee, C. (author)
conference paper 2010
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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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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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Braza, M. (author), El Akoury, R. (author), Martinat, G. (author), Hoarau, Y. (author), Harran, G. (author), Chassaing, P. (author)
This paper analyses the performances of adapted URANS and DES turbulence^modelling for high-Reynolds 2D and 3D aerodynamic flows with a pronounced periodic character. The flow configurations is the NACA0012 airfoil in pitch (experimental test-case by Mc Croskey & Mc Alistair, 1976) at Reynolds number 0.98x10^6, as well as the inherently unsteady...
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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Hassani, K. (author), Navidbakhsh, M. (author), Rostami, M. (author)
By using CFD method, Fluent code , Aneurysm of specific locations of aorta artery have been simulated .For ascending, descending and abdominal aorta, aneurysm of different sizes and diameters are modeled. Geometrical data of aorta's sections have been extracted from physiological texts. Locations of hypothetical aneurysms are placed in the...
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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Meeks, E. (author), Chou, C.P. (author)
In the past decade, the computational fluid dynamics (CFD) community has put increasing attention on incorporating complex chemistry and physics into CFD simulations. However, for many practicing engineers today there is still much lacking in the effectiveness of reacting-flow simulation. Particularly in the area of combustion, the results can...
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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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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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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Wild, J. (author), Brezillon, J. (author), Mertins, R. (author), Quagliarella, D. (author), Germain, E. (author), Amoignon, O. (author), Moens, F. (author)
The design activity within the EUROLIFT II project is targeted towards an improvement of the take-off performance of a generic transport aircraft configuration by a re-design of the trailing edge flap. The involved partners applied different optimization strategies as well as different types of flow solvers in order to cover a wide range of...
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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Kumano, T. (author), Jeong, S. (author), Obayashi, S. (author), Ito, Y. (author), Hatanaka, K. (author), Morino, H. (author)
A Multidisciplinary Design Optimization (MDO) system for a wing with nacelle and pylon is developed. The present MDO system is based on the integration of Computational Fluid Dynamics (CFD) codes and NASTRAN based an aeroelastic-structural interface code. The Kriging model is employed to save the computational time of objective function...
conference paper 2006
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