Browsing NTNU Open by Author "Roy, Subhadeep"
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Crack localization and the interplay between stress enhancement and thermal noise
Sinha, Santanu; Roy, Subhadeep; Hansen, Alex (Peer reviewed; Journal article, 2021)We study the competition between thermal fluctuations and stress enhancement in the failure process of a disordered system by using a local load sharing fiber bundle model. The thermal noise is introduced by defining a ... -
Creep failure in a threshold-activated dynamics: Role of temperature during a subcritical loading
Roy, Subhadeep; Hatano, Takahiro (Peer reviewed; Journal article, 2020)Creep is a time-dependent deformation of solids at relatively low stresses, leading to the breakdown with time. Here we propose a simple model for creep failure of disordered solids in which temperature and stress are ... -
Disorder-induced non-linear growth of fingers in immiscible two-phase flow in porous media
Sinha, Santanu; Méheust, Yves; Fyhn, Hursanay; Roy, Subhadeep; Hansen, Alex (Journal article; Peer reviewed, 2024)Immiscible two-phase flow in porous media produces different types of patterns depending on the capillary number Ca and viscosity ratio M. At high Ca, viscous instability of the fluid–fluid interface occurs when the displaced ... -
Effective rheology of two-phase flow in a capillary fiber bundle model
Roy, Subhadeep; Hansen, Alex; Sinha, Santanu (Journal article; Peer reviewed, 2019)We investigate the effective rheology of two-phase flow in a bundle of parallel capillary tubes carrying two immiscible fluids under an external pressure drop. The diameter of the tubes vary along the length which introduce ... -
Flow-Area Relations in Immiscible Two-Phase Flow in Porous Media
Roy, Subhadeep; Sinha, Santanu; Hansen, Alex (Journal article; Peer reviewed, 2020)We present a theoretical framework for immiscible incompressible two-phase flow in homogeneous porous media that connects the distribution of local fluid velocities to the average seepage velocities. By dividing the pore ... -
From Nucleation to Percolation: The Effect of System Size when Disorder and Stress Localization Compete
Roy, Subhadeep (Peer reviewed; Journal article, 2021)A phase diagram for a one-dimensional fiber bundle model is constructed with a continuous variation in two parameters guiding the dynamics of the model: strength of disorder and range of stress relaxation. When the range ... -
Model for creep failure with healing
Roy, Subhadeep; Hatano, Takahiro (Journal article; Peer reviewed, 2022) -
Phase transitions and correlations in fracture processes where disorder and stress compete
Sinha, Santanu; Roy, Subhadeep; Hansen, Alex (Peer reviewed; Journal article, 2020)We study the effect of the competition between disorder and stress enhancement in fracture processes using the local load sharing fiber bundle model, a model that hovers on the border between analytical tractability and ... -
Role of Pore-Size Distribution on Effective Rheology of Two-Phase Flow in Porous Media
Roy, Subhadeep; Sinha, Santanu; Hansen, Alex (Peer reviewed; Journal article, 2021)Immiscible two-phase flow of Newtonian fluids in porous media exhibits a power law relationship between flow rate and pressure drop when the pressure drop is such that the viscous forces compete with the capillary forces. ... -
Size distribution of emitted energies in local load sharing fiber bundles
Roy, Subhadeep; Biswas, Soumyajyoti (Journal article; Peer reviewed, 2021)