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Ridge network in crumpled paper.
Andresen CA, Hansen A, Schmittbuhl J. Andresen CA, et al. Among authors: hansen a. Phys Rev E Stat Nonlin Soft Matter Phys. 2007 Aug;76(2 Pt 2):026108. doi: 10.1103/PhysRevE.76.026108. Epub 2007 Aug 20. Phys Rev E Stat Nonlin Soft Matter Phys. 2007. PMID: 17930105
The network formed by ridges in a straightened sheet of crumpled paper is studied using a laser profilometer. Square sheets of paper were crumpled into balls, unfolded, and their height profile measured. ...The tail of the ridge length distribution was found to foll …
The network formed by ridges in a straightened sheet of crumpled paper is studied using a laser profilometer. Square sheets of …
Dynamic rearrangements and packing regimes in randomly deposited two-dimensional granular beds.
Bratberg I, Radjai F, Hansen A. Bratberg I, et al. Among authors: hansen a. Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Sep;66(3 Pt 1):031303. doi: 10.1103/PhysRevE.66.031303. Epub 2002 Sep 19. Phys Rev E Stat Nonlin Soft Matter Phys. 2002. PMID: 12366108
We study the structural properties of two-dimensional granular packings prepared by random deposition from a source line. We consider a class of random ballistic deposition models based on single-particle relaxation rules controlled by a critical angle, and w …
We study the structural properties of two-dimensional granular packings prepared by random deposition from a source line. We consider …
Intermittent flow of a collection of rigid frictional disks in a vertical pipe.
Bratberg I, Radjai F, Hansen A. Bratberg I, et al. Among authors: hansen a. Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jan;71(1 Pt 1):011301. doi: 10.1103/PhysRevE.71.011301. Epub 2005 Jan 5. Phys Rev E Stat Nonlin Soft Matter Phys. 2005. PMID: 15697589
We study the quasistatic flow of a collection of rigid frictional disks pushed upward (against the gravity) inside a narrow vertical pipe by a compliant mechanism. The contact dynamics method was used for the numerical simulations in combination with a
We study the quasistatic flow of a collection of rigid frictional disks pushed upward (against the gravity) inside a narrow ve …
Validity of the Janssen law in narrow granular columns.
Bratberg I, Måløy KJ, Hansen A. Bratberg I, et al. Among authors: hansen a. Eur Phys J E Soft Matter. 2005 Nov;18(3):245-52. doi: 10.1140/epje/e2005-00030-1. Epub 2005 Oct 18. Eur Phys J E Soft Matter. 2005. PMID: 16231076
The apparent mass dependence on height is not in good agreement with the Janssen law using a one-parameter fit. A two-parameter fit yielded good results for the apparent mass during upward and downward movement at constant velocity of the granular column inside the …
The apparent mass dependence on height is not in good agreement with the Janssen law using a one-parameter fit. A two-paramete …
Mapping of the roughness exponent for the fuse model for fracture.
Bakke JO, Hansen A. Bakke JO, et al. Among authors: hansen a. Phys Rev Lett. 2008 Feb 1;100(4):045501. doi: 10.1103/PhysRevLett.100.045501. Epub 2008 Jan 28. Phys Rev Lett. 2008. PMID: 18352294
We show that the fuse model gives a disorder dependent roughness exponent for narrow disorders when the lattice is influencing the fracture growth. ...For very broad disorders the distribution of jumps becomes a Lévy distribution and the Lévy characteristics contrib …
We show that the fuse model gives a disorder dependent roughness exponent for narrow disorders when the lattice is influencing the fr …
Universality classes in constrained crack growth.
Gjerden KS, Stormo A, Hansen A. Gjerden KS, et al. Among authors: hansen a. Phys Rev Lett. 2013 Sep 27;111(13):135502. doi: 10.1103/PhysRevLett.111.135502. Epub 2013 Sep 24. Phys Rev Lett. 2013. PMID: 24116791
Based on an extension of the fiber bundle model we investigate numerically the motion of a crack front through a weak plane separating a soft and an infinitely stiff block. ...At smaller scales, coalescence of holes dominates the motion, giving a rough …
Based on an extension of the fiber bundle model we investigate numerically the motion of a crack front through a weak plane se …
Crossover behavior in burst avalanches: signature of imminent failure.
Pradhan S, Hansen A, Hemmer PC. Pradhan S, et al. Among authors: hansen a. Phys Rev Lett. 2005 Sep 16;95(12):125501. doi: 10.1103/PhysRevLett.95.125501. Epub 2005 Sep 12. Phys Rev Lett. 2005. PMID: 16197082
The statistics of damage avalanches during a failure process typically follows a power law. When these avalanches are recorded only near the point at which the system fails catastrophically, one finds that the power law has an exponent which is different from that o …
The statistics of damage avalanches during a failure process typically follows a power law. When these avalanches are recorded …
Phase diagram of optimal paths.
Hansen A, Kertész J. Hansen A, et al. Phys Rev Lett. 2004 Jul 23;93(4):040601. doi: 10.1103/PhysRevLett.93.040601. Epub 2004 Jul 20. Phys Rev Lett. 2004. PMID: 15323745
We also introduce a simple and efficient algorithm, which solves the d-dimensional model numerically in O(N(1+df/d)) steps, where df is the fractal dimension of the path. ...A new strong-disorder phase occurs where the optimum paths are self-affine with parameter-de …
We also introduce a simple and efficient algorithm, which solves the d-dimensional model numerically in O(N(1+df/d)) steps, where df …
Relation between pressure and fractional flow in two-phase flow in porous media.
Knudsen HA, Hansen A. Knudsen HA, et al. Among authors: hansen a. Phys Rev E Stat Nonlin Soft Matter Phys. 2002 May;65(5 Pt 2):056310. doi: 10.1103/PhysRevE.65.056310. Epub 2002 May 16. Phys Rev E Stat Nonlin Soft Matter Phys. 2002. PMID: 12059706
We study average flow properties in porous media using a two-dimensional network simulator. It models the dynamics of two-phase immiscible bulk flow where film flow can be neglected. The boundary conditions are biperiodic, which provide a means of studying steady-st …
We study average flow properties in porous media using a two-dimensional network simulator. It models the dynamics of two-phase immis …
Ensemble distribution for immiscible two-phase flow in porous media.
Savani I, Bedeaux D, Kjelstrup S, Vassvik M, Sinha S, Hansen A. Savani I, et al. Among authors: hansen a. Phys Rev E. 2017 Feb;95(2-1):023116. doi: 10.1103/PhysRevE.95.023116. Epub 2017 Feb 27. Phys Rev E. 2017. PMID: 28297862
We construct an ensemble distribution to describe steady immiscible two-phase flow of two incompressible fluids in a porous medium. ...The entropy production at the scale of the porous medium is shown to give the expected product of the average flow and its driving force, …
We construct an ensemble distribution to describe steady immiscible two-phase flow of two incompressible fluids in a porous medium. . …
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