Title Participants Abstract "Uncertain parameter numerical model updating according to variable modal test data in application of large composite fuselage panel" "Bart Peeters, Herman Van Der Auweraer" "This paper presents a novel approach in the field of experimental and numerical investigation of mechanical properties of composite structures. It takes into account test data variability resulting from structural dynamic properties measurement and uses them to quantify uncertainties in model parameters updating. The main goal of the conducted research is to investigate the dynamic properties of fibre reinforced composite structures. Non-destructive experimental and numerical simulation methods are used hereto. In the experimental part, different test configurations were taken into account. The excitation was performed by means of random and harmonic, single and multi point stimuli while the response measurement was done through contact and non-contact acceleration, velocity and dynamic strain sensing. The test results are applied in two ways: for the structural identification of the object and for non-deterministic updating of the numerical model according to a range of experimental models obtained from test. The sources of the test data variabilities were related to the excitation and measurement technique applied for the investigated object. Non - deterministic model updating and verification & validation included uncertainties of its parameters by means of interval and stochastic methods. A number of variable test modal models were statistically assessed to investigate impact of variability source onto modal model parameters. The presented research was conducted in the context of the FP6 Marie Curie project UNVICO-2. © 2010 - IOS Press and the authors." "A temperature dependent multi-ion model for time accurate numerical simulation of the electrochemical machining process. Part II: Numerical simulation" "Daan Deconinck, Steven Van Damme, Johan Deconinck" "The temperature distribution and shape evolution during electrochemical machining (ECM) are the result of a large number of intertwined physical processes. Electrolyte flow, electrical conduction, ion transport, electrochemical reactions, heat generation and heat transfer strongly influence one another, making modeling and numerical simulation of ECM a very challenging procedure. In part I, a temperature dependent multi-ion transport and reaction model (MITReM) is put forward which considers mass transfer as a consequence of diffusion, convection and migration, combined with the electroneutrality condition and linearized temperature dependent polarization relations at the electrode-electrolyte interface. The flow field is calculated using the incompressible laminar Navier-Stokes equations for viscous flow. The local temperature is obtained by solving internal energy balance, enabling the use of temperature dependent expressions for several physical properties such as the ion diffusion coefficients and electrolyte viscosity. In this second part, the temperature dependent MITReM is used to simulate ECM of stainless steel in aqueous NaNO3 electrolyte solution. The effects of temperature, electrode thermal conduction, reaction heat generation, electrolyte flow and water depletion are investigated. A comparison is made between the temperature dependent potential model and MITReM." "A delta-rule model of numerical and non-numerical order processing" "Tom Verguts, Filip Van Opstal" "Numerical implementation and sensitivity analysis of a wave energy converter in a time-dependent mild-slope equation model" "Charlotte Beels, Peter Troch, Griet De Backer, Marc Vantorre, Julien De Rouck" "Development and validation of a numerical model of scour protection around monopiles under currents" "Carlos Arboleda Chavez, Minghao Wu, Peter Troch, Vicky Stratigaki" "Scour around monopiles has been widely studied, however, scour protection—made of stones—around monopiles has not. To cover this knowledge gap, this work presents the development of a numerical model for the study of the flow within the scour protection around monopiles and the first results obtained with this model. The development of the model was done using fully open source tools that have been thriving in the scientific community, such as the OpenFOAM framework, for the numerical model, and the Python programming language for the parametrization of the mesh and setup of the cases. This model approaches the flow within the scour protection as a porous medium. The latter has successfully been used by Nielsen et al. (2013). Their and our results show a good agreement with experimental results." "A Pore-Scale Model for Permeable Biofilm: Numerical Simulations and Laboratory Experiments" "David Landa-Marbán, Na Liu, Sorin POP, Kundan Kumar, Per Pettersson, Gunhild Boedtker, Tormod Skauge, Florin Adrian Radu" "In this paper, we derive a pore-scale model for permeable biofilm formation in a two-dimensional pore. The pore is divided into two phases: water and biofilm. The biofilm is assumed to consist of four components: water, extracellular polymeric substance (EPS), active bacteria, and dead bacteria. The flow of water is modeled by the Stokes equation, whereas a diffusion–convection equation is involved for the transport of nutrients. At the biofilm–water interface, nutrient transport and shear forces due to the water flux are considered. In the biofilm, the Brinkman equation for the water flow, transport of nutrients due to diffusion and convection, displacement of the biofilm components due to reproduction/death of bacteria, and production of EPS are considered. A segregated finite element algorithm is used to solve the mathematical equations. Numerical simulations are performed based on experimentally determined parameters. The stress coefficient is fitted to the experimental data. To identify the critical model parameters, a sensitivity analysis is performed. The Sobol sensitivity indices of the input parameters are computed based on uniform perturbation by ±10% of the nominal parameter values. The sensitivity analysis confirms that the variability or uncertainty in none of the parameters should be neglected." "Development of a numerical model for liquid pool evaporation" "Bart Merci" "Numerical study of deposition mechanisms of nanoparticles in a human upper airway model" "Florian Krause" NA "Numerical model for CFD-simulation of the flow field in the anastomosis region of coronary bypasses" "Marloes De Witte, Abigaïl Swillens, Lasse Lovstakken, Havard Nordgaard, Denis Van Loo, Bram Trachet, Jan Vierendeels, Patrick Segers" "Coronary artery bypass surgery is a treatment for ischemic heart disease and can increase life quality and expectancy. The results after the treatment depend largely on the patency of the bypass grafts, which are used to bypass the narrowed arteries on the heart. Long-term patency is mainly determined by the progression of atherosclerosis and intimal hyperplasia (IH) within the bypass grafts, which are believed to be related to unfavourable wall shear stress (e.g. low and oscillatory WSS) exerted on the endothelial cells. To investigate the potential role of hemodynamic forces on the endothelial cells and the impact of the severity of the bypassed arterial stenosis on the flow fields, we developed a computational model of a LIMA-to-LAD anastomosis region obtained from a porcine in-vivo cast. In addition, the same porcine experiment provided the necessary up- and downstream boundary conditions for the simulations. The model has been applied to simulate the flow field in 5 cases, corresponding with 100, 97, 90, 75 and 0% LAD stenosis, in order to quantify the effect of the stenosis on resulting flow fields and on WSS distributions. Low stenosis degrees are associated with competitive LAD and LIMA flow and low WSS in the LIMA, which might contribute to WSS-related remodeling and suboptimal performance of the LIMA bypass." "Assessment of numerical simulation strategies for ultrasonic color blood flow imaging, based on a computer and experimental model of the carotid artery" "Abigaïl Swillens, Thomas De Schryver, Lasse Lovstakken, Hans Torp, Patrick Segers" "Ultrasonic Doppler techniques are well established and allow qualitative and quantitative flow analysis. However, due to inherent limitations of the imaging process, the actual flow dynamics and the ultrasound (US) image do not always correspond. To investigate the performance of ultrasonic flow imaging methods, computational fluid dynamics (CFD) can play an important role. CFD simulations can be directly processed to mimic ultrasonic images or can be further coupled to ultrasound simulation models. We studied both approaches in the clinically relevant setting of a carotid artery using color flow images (CFI). The first order approach consisted of producing ultrasound images by color-coding CFD-simulations. For the second order approach, CFI was simulated using an ultrasound simulator, which models blood as a collection of point scatterers moving according to the CFD velocity fields. Color flow images were also measured in an experimental setup of the same carotid geometry for comparison. Results showed that during dynamic stages of the cardiac cycle, realistic ultrasound data can only be achieved when incorporating both the dynamic image formation and the measurement statistics into the simulations."