Numerical methods for hydraulic transients in visco-elastic pipes

Numerical Simulation of Hydraulic Transients in Rijeka HPP

Original scientific paper In this work a new approach considering numerical modelling of waterhammer dissipation and attenuation is proposed. The classical Allievi liquid flow model has been extended with the Brunone unsteady friction model which includes separation of the local and convective unsteady friction factor. A widely-adopted approach in solving this model is treatment of the unsteady...

Numerical Methods for Analyzing the Transients in Medium Voltage Networks

2 A Computational Model for Visco - Elastic

Particle diiusion in rotating drums is studied via computer simulations using a full 3-D model which does not involve any arbitrary input parameters. The diiusion coeecient for single-component systems agree qualitatively with previous experimental results. On the other hand, the diiusion coeecient for two-component systems is shown to be a highly nonlinear function of the rotation velocity. It...

Mathematical analysis of thermo-visco-elastic models

Motywacją do badań nad równaniami opisującymi odkształcenia termo-lepko-sprężyste jest potrzeba lepszego opisu procesów zachodzących w różnych materiałach oraz zbudowania lepszych modeli ich zachowania pod wpływem działania sił zewnętrznych. Wraz z rozwojem techniki zdobywamy głębszą wiedzę na temat różnych tworzyw. Pozwala nam to na tworzenie coraz bardziej poprawnych modeli opisujących zachow...

Numerical methods for scattering by inhomogeneities in 3D elastic waveguides

e-mail: vahan.baronian, karim.jezzine, sylvain.chatillon @cea.fr ! ! Abstract Models for ultrasonic guided wave NDT are developed at CEA LIST and integrated into the CIVA platform. Models already available in CIVA 11 GWT deal with plates, cylinders, guides of arbitrary cross section, possibly multilayered. Mode computation, radiated field from different type of transducers (contact with or with...