Publicaties

Finite element analysis (FEA) enjoys a variety of applications in the field of biomechanics, from simulated fatigue testing of an intramedullary rod to studying stresses in a displacement field generated within a single cell. The powerful generality of the finite element method implies that often no purpose-specific method or model need be developed to study a system, but regrettably also implies a certain computational cost. FEA-supported ...

The numerical simulation of Bileaflet Mechanical Heart Valves (BMHVs) has gained strong interest in the last years, as a design and optimisation tool. In this paper, a strong coupling algorithm for the partitioned fluid-structure interaction simulation of a BMHV is presented. The convergence of the coupling iterations between the flow solver and the leaflet motion solver is accelerated by using the Jacobian with the derivatives of the pressure ...

We study a variance reduction strategy based on control variables for simulating the averaged macroscopic behavior of a stochastic slow-fast system. We assume that this averaged behavior can be written in terms of a few slow degrees of freedom, and that the fast dynamics is ergodic for every fixed value of the slow variable. The time derivative for the averaged dynamics can then be approximated by a Markov chain Monte Carlo method. The ...

Two major trends in high-performance computing, namely, larger numbers of cores and the growing size of on-chip cache memory, are creating signiU+FB01cant challenges for evaluating the design space of future processor architectures. Fast and scalable simulations are therefore needed to allow for suU+FB03cient exploration of large multi-core systems within a limited simulation time budget. By bringing together accurate high-abstraction ...

Sniper is a next generation parallel, high-speed and accurate x86 simulator. This multi-core simulator is based on the interval core model and the Graphite simulation infrastructure, allowing for fast and accurate simulation and for trading off simulation speed for accuracy to allow a range of flexible simulation options when exploring different homogeneous and heterogeneous multi-core architectures. The Sniper simulator allows one to perform ...

This paper studies the feasibility of acquiring the multiplesource-receiver transfer functions for the prediction of pass-by noise Sound Pressure Level (SPL) of vehicles with the Fast Multipole Boundary Element Method (FMBEM). Employing measurements and simulations, the influence offrequency resolution, mesh density, mesh accuracy and solver accuracy on the computation time and on the overall SPL and the third octave band SPL is investigated. It ...

OBJECTIVES: As conventional laparoscopic procedural training requires live animals or cadaver organs, virtual simulation seems an attractive alternative. Therefore, we compared the transfer of training for the laparoscopic cholecystectomy from porcine cadaver organs vs virtual simulation to surgery in a live animal model in a prospective randomized trial. DESIGN: After completing an intensive training in basic laparoscopic skills, 3 groups of 10 ...

Many applications require fast and even real-time multibody simulations. Until recently, strongly simplified models were used in order to reach real-time constraints. A novel system-level model reduction technique, namely Global Modal Parameterization (GMP), enables the reduction of a complex mechanism, incorporating flexibility. This technique groups all computationally demanding tasks in a preprocessing phase, which allows the actual ...

In this paper, we introduce a fast reciprocal space method for image simulation. It is well known that the scattering matrix (SM) P with N×N elements consists of N different structure factors and N different excitation errors. However, most structure factors of the SM P are extremely small so that they can be neglected. Therefore, the size of the SM P is reduced drastically. On the other hand, the structure factors have two-dimensional space ...