We discuss the influence of white noise on a generic dynamical finite-time-singularity model for a single degree of freedom. We find that the noise effectively resolves the finite-time-singularity and replaces it by a first-passage-time or absorbing state distribution with a peak at the singularity and a long time tail exhibiting power law or stretched exponential behavior. The study might be of relevance in the context of hydrodynamics on a nanometer scale, in material physics, and in biophysics.
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http://dx.doi.org/10.1103/PhysRevE.66.021103 | DOI Listing |
Phys Rev Lett
August 2024
Institute for Theoretical Physics I, Ruhr University Bochum, Universitätsstrasse 150, D-44801 Bochum, Germany.
Recently, Josserand et al. proposed a stochastic nonlinear Schrödinger model for finite-time singularity-mediated turbulence [Phys. Rev.
View Article and Find Full Text PDFSoft Matter
March 2024
Department of Physics, Durham University, Science Laboratories, South Road, Durham DH1 3LE, UK.
Motivated by recent experiments studying the creep and breakup of a protein gel under stress, we introduce a simple mesoscopic model for the irreversible failure of gels and fibrous materials, and demonstrate it to capture much of the phenomenology seen experimentally. This includes a primary creep regime in which the shear rate decreases as a power law over several decades of time, a secondary crossover regime in which the shear rate attains a minimum, and a tertiary regime in which the shear rate increases dramatically up to a finite time singularity, signifying irreversible material failure. The model also captures a linear Monkman-Grant scaling of the failure time with the earlier time at which the shear rate attained its minimum, and a Basquin-like power law scaling of the failure time with imposed stress, as seen experimentally.
View Article and Find Full Text PDFPhys Rev E
February 2023
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
In the context of statistical physics, critical phenomena are accompanied by power laws having a singularity at the critical point where a sudden change in the state of the system occurs. In this work we show that lean blowout (LBO) in a turbulent thermoacoustic system is accompanied by a power law leading to finite-time singularity. As a crucial discovery of the system dynamics approaching LBO, we unravel the existence of the discrete scale invariance (DSI).
View Article and Find Full Text PDFChaos
April 2022
Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India.
Coronavirus disease 2019 (COVID-19) has rapidly spread throughout our planet, bringing human lives to a standstill. Understanding the early transmission dynamics of a wave helps plan intervention strategies such as lockdowns that mitigate further spread, minimizing the adverse impact on humanity and the economy. Exponential growth of infections was thought to be the defining feature of an epidemic in its initial growth phase.
View Article and Find Full Text PDFJ Eng Math
June 2021
TU Wien, Institute of Fluid Mechanics and Heat Transfer, Getreidemarkt 9, 1060 Vienna, Austria.
Unlabelled: The method of matched asymptotic expansions is applied to the investigation of transitional separation bubbles. The problem-specific Reynolds number is assumed to be large and acts as the primary perturbation parameter. Four subsequent stages can be identified as playing key roles in the characterization of the incipient laminar-turbulent transition process: due to the action of an adverse pressure gradient, a classical laminar boundary layer is forced to separate marginally (I).
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