【国際交流・公開研究セミナー】Computational Engineering Science in Aachen and Applications in Civil and Biomedical Engineering
講演者:tProf. Marek Behr(Germany, RWTH Aachen University)
Prof. Marek Behr (Germany, RWTH Aachen Univ.)が来日される機会に,同氏が展開している土木工学,生体医療工学等への計算工学の応用、ドイツの計算工学研究の拠点であるRWTH Aachen大学における計算工学研究(モデリングやシミュレーション技術,最適化手法など)の最近の成果に関するご講演をお願いしました.是非ご参集ください.
アブストラクト:
Modeling, simulation and optimization play an increasingly-important role in many engineering areas. We summarize recent Aachen initiatives to strengthen the education of a new generation of computational engineers, and then we review research activities in two application areas: civil engineering and biomedical engineering.
We employ a set of modeling techniques based on stabilized space-time finite element formulation of the Navier-Stokes equations in deforming domains, with a shear-slip mesh update used to accommodate the large regular movement like rotation about a fixed axis, and an elastic mesh update used to accommodate the smaller irregular movement like that of a free surface.
In the field of civil engineering, we discuss free-surface flow applications, as well as the first steps towards an accurate simulation of a Voith Schneider Propeller, where both mesh update techniques must be applied simultaneously.
In the field of biomedical engineering, we focus on the design of ventricular assist devices. Numerical simulation of flow in such implantable blood pumps has the potential to shorten the design cycle and give the designers important insights into causes of blood damage and suboptimal performance.
In order to obtain quantitative blood damage prediction, we are developing cumulative tensor-based measures of strain experienced by individual blood cells, and correlating them with available blood damage data. In the first approximation, red blood cells under shear are modeled as deforming droplets, and their deformation is tracked along pathlines of the computed flow field.
This application presents a ripe target for shape optimization and optimal control techniques. In order to gauge the influence of the fluid constitutive model on the outcome of shape optimization tasks, we present a comparison of model problem computations based on the Navier-Stokes equations on one hand, and on a more accurate shear-thinning Carreau-Yasuda model on the other.
Parallel performance information obtained on a 4096 CPUs of an IBM Blue Gene system is also presented.
連絡先:中央大学理工学部土木工学科
樫山 和男
電話: 03-3817-1808