Speaker: Dr. Oyama (MathAM-OIL) Title: Avalanche Interpretation of the Power-law of the Energy Spectrum in Three-Dimensional Dense Granular Flow Abstract: Molecular dynamics simulations on dense granular packings under a very slow simple shear flow have revealed that the statistical properties of the non-affine velocity field are consistent with those of classical turbulence of viscous fluid. However, such observations have been limited to two-dimensional systems and knowledge about three dimensional systems is still missing[1]. In this work[2], we conducted direct numerical simulations on three-dimensional dense granular flow and found that the statistical property is not turbulent-like in three dimension. We propose a new understanding from the perspective of avalanche dynamics. This […]

New Methods for Extraction of Important Information from Various Time Series in Bubble Columns Stoyan Nedeltchev Visiting Lecturer at Department of Chemical Engineering Tokyo Institute of Technology (Japan) In this presentation will be demonstrated that useful information can be extracted from various time-dependent signals based on new methods employing the concept of reconstruction of the time series into numerous state vectors. This reconstruction technique is part of the nonlinear chaos theory (Schouten and Van den Bleek, Chem. Eng. J. 53, 75-87, 1993). The development of new methods for extraction of useful and hidden information from various time-dependent signals (differential pressure and gas holdup fluctuations as well as X-ray scans) is […]