Bodenschatz, Eberhard

[["dc.bibliographiccitation.artnumber","124502"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","116"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Xu, Haitao"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.contributor.author","Grauer, Rainer"],["dc.date.accessioned","2020-12-10T18:25:40Z"],["dc.date.available","2020-12-10T18:25:40Z"],["dc.date.issued","2016"],["dc.description.abstract","Three-dimensional turbulent flows are characterized by a flux of energy from large to small scales, which breaks the time reversal symmetry. The motion of tracer particles, which tend to lose energy faster than they gain it, is also irreversible. Here, we connect the time irreversibility in the motion of single tracers with vortex stretching and thus with the generation of the smallest scales."],["dc.identifier.doi","10.1103/PhysRevLett.116.124502"],["dc.identifier.eissn","1079-7114"],["dc.identifier.isi","000372729200011"],["dc.identifier.issn","0031-9007"],["dc.identifier.pmid","27058081"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75783"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1079-7114"],["dc.relation.issn","0031-9007"],["dc.title","Single-Particle Motion and Vortex Stretching in Three-Dimensional Turbulent Flows"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","119"],["dc.contributor.author","Hsu, Hsin-Fang"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.contributor.author","Westendorf, Christian"],["dc.contributor.author","Gholami, Azam"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Tarantola, Marco"],["dc.contributor.author","Beta, Carsten"],["dc.date.accessioned","2020-12-10T18:25:44Z"],["dc.date.available","2020-12-10T18:25:44Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1103/PhysRevLett.119.148101"],["dc.identifier.eissn","1079-7114"],["dc.identifier.issn","0031-9007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75806"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Variability and Order in Cytoskeletal Dynamics of Motile Amoeboid Cells"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","035101"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Physics of Fluids"],["dc.bibliographiccitation.volume","25"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.contributor.author","Xu, H."],["dc.date.accessioned","2018-11-07T09:27:15Z"],["dc.date.available","2018-11-07T09:27:15Z"],["dc.date.issued","2013"],["dc.description.abstract","We describe the structure and dynamics of turbulence by the scale-dependent perceived velocity gradient tensor as supported by following four tracers, i.e., fluid particles, that initially form a regular tetrahedron. We report results from experiments in a von Kaacutermaacuten swirling water flow and from numerical simulations of the incompressible Navier-Stokes equation. We analyze the statistics and the dynamics of the perceived rate of strain tensor and vorticity for initially regular tetrahedron of size r0 from the dissipative to the integral scale. Just as for the true velocity gradient, at any instant, the perceived vorticity is also preferentially aligned with the intermediate eigenvector of the perceived rate of strain. However, in the perceived rate of strain eigenframe fixed at a given time t = 0, the perceived vorticity evolves in time such as to align with the strongest eigendirection at t = 0. This also applies to the true velocity gradient. The experimental data at the higher Reynolds number suggests the existence of a self-similar regime in the inertial range. In particular, the dynamics of alignment of the perceived vorticity and strain can be rescaled by t0, the turbulence time scale of the flow when the scale r0 is in the inertial range. For smaller Reynolds numbers we found the dynamics to be scale dependent."],["dc.identifier.doi","10.1063/1.4795547"],["dc.identifier.isi","000316951900026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30492"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","1070-6631"],["dc.title","Tetrahedron deformation and alignment of perceived vorticity and strain in a turbulent flow"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","2218"],["dc.bibliographiccitation.journal","Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences"],["dc.bibliographiccitation.volume","380"],["dc.contributor.author","Buaria, Dhawal"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.date.accessioned","2022-02-01T10:31:22Z"],["dc.date.available","2022-02-01T10:31:22Z"],["dc.date.issued","2022"],["dc.description.abstract","Intense fluctuations of energy dissipation rate in turbulent flows result from the self-amplification of strain rate via a quadratic nonlinearity, with contributions from vorticity (via the vortex stretching mechanism) and pressure-Hessian—which are analysed here using direct numerical simulations of isotropic turbulence on up to 12   288 3 grid points, and Taylor-scale Reynolds numbers in the range 140–1300. We extract the statistics involved in amplification of strain and condition them on the magnitude of strain. We find that strain is self-amplified by the quadratic nonlinearity, and depleted via vortex stretching, whereas pressure-Hessian acts to redistribute strain fluctuations towards the mean-field and hence depletes intense strain. Analysing the intense fluctuations of strain in terms of its eigenvalues reveals that the net amplification is solely produced by the third eigenvalue, resulting in strong compressive action. By contrast, the self-amplification acts to deplete the other two eigenvalues, whereas vortex stretching acts to amplify them, with both effects cancelling each other almost perfectly. The effect of the pressure-Hessian for each eigenvalue is qualitatively similar to that of vortex stretching, but significantly weaker in magnitude. Our results conform with the familiar notion that intense strain is organized in sheet-like structures, which are in the vicinity of, but never overlap with tube-like regions of intense vorticity due to fundamental differences in their amplifying mechanisms. This article is part of the theme issue ‘Scaling the turbulence edifice (part 1)’."],["dc.description.abstract","Intense fluctuations of energy dissipation rate in turbulent flows result from the self-amplification of strain rate via a quadratic nonlinearity, with contributions from vorticity (via the vortex stretching mechanism) and pressure-Hessian—which are analysed here using direct numerical simulations of isotropic turbulence on up to 12   288 3 grid points, and Taylor-scale Reynolds numbers in the range 140–1300. We extract the statistics involved in amplification of strain and condition them on the magnitude of strain. We find that strain is self-amplified by the quadratic nonlinearity, and depleted via vortex stretching, whereas pressure-Hessian acts to redistribute strain fluctuations towards the mean-field and hence depletes intense strain. Analysing the intense fluctuations of strain in terms of its eigenvalues reveals that the net amplification is solely produced by the third eigenvalue, resulting in strong compressive action. By contrast, the self-amplification acts to deplete the other two eigenvalues, whereas vortex stretching acts to amplify them, with both effects cancelling each other almost perfectly. The effect of the pressure-Hessian for each eigenvalue is qualitatively similar to that of vortex stretching, but significantly weaker in magnitude. Our results conform with the familiar notion that intense strain is organized in sheet-like structures, which are in the vicinity of, but never overlap with tube-like regions of intense vorticity due to fundamental differences in their amplifying mechanisms. This article is part of the theme issue ‘Scaling the turbulence edifice (part 1)’."],["dc.identifier.doi","10.1098/rsta.2021.0088"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/98843"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-517"],["dc.relation.eissn","1471-2962"],["dc.relation.issn","1364-503X"],["dc.rights.uri","https://royalsociety.org/journals/ethics-policies/data-sharing-mining/"],["dc.title","Generation of intense dissipation in high Reynolds number turbulence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","467"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Circulation"],["dc.bibliographiccitation.lastpage","476"],["dc.bibliographiccitation.volume","120"],["dc.contributor.author","Fenton, Flavio H."],["dc.contributor.author","Luther, Stefan"],["dc.contributor.author","Cherry, Elizabeth M."],["dc.contributor.author","Otani, Niels F."],["dc.contributor.author","Krinsky, Valentin"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.contributor.author","Gilmour, Robert F."],["dc.date.accessioned","2022-03-01T11:43:52Z"],["dc.date.available","2022-03-01T11:43:52Z"],["dc.date.issued","2009"],["dc.identifier.doi","10.1161/CIRCULATIONAHA.108.825091"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/102862"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-531"],["dc.relation.eissn","1524-4539"],["dc.relation.issn","0009-7322"],["dc.title","Termination of Atrial Fibrillation Using Pulsed Low-Energy Far-Field Stimulation"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","079901"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Physics of Fluids"],["dc.bibliographiccitation.volume","24"],["dc.contributor.author","Falkovich, Gregory"],["dc.contributor.author","Xu, H."],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.contributor.author","Biferale, Luca"],["dc.contributor.author","Boffetta, Guido"],["dc.contributor.author","Lanotte, Alessandra S."],["dc.contributor.author","Toschi, Federico"],["dc.date.accessioned","2018-11-07T09:08:22Z"],["dc.date.available","2018-11-07T09:08:22Z"],["dc.date.issued","2012"],["dc.identifier.doi","10.1063/1.4738734"],["dc.identifier.isi","000308406000055"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26017"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","1070-6631"],["dc.title","On Lagrangian single-particle statistics (vol 24, 055102, 2012)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","119"],["dc.contributor.author","Prabhakaran, Prasanth"],["dc.contributor.author","Weiss, Stephan"],["dc.contributor.author","Krekhov, Alexei"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.date.accessioned","2020-12-10T18:25:44Z"],["dc.date.available","2020-12-10T18:25:44Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1103/PhysRevLett.119.128701"],["dc.identifier.eissn","1079-7114"],["dc.identifier.issn","0031-9007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/75804"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Can Hail and Rain Nucleate Cloud Droplets?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","709"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Nature Physics"],["dc.bibliographiccitation.lastpage","712"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Xu, H."],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.date.accessioned","2018-11-07T08:52:45Z"],["dc.date.available","2018-11-07T08:52:45Z"],["dc.date.issued","2011"],["dc.description.abstract","The disorganized fluctuations of turbulence are crucial in the transport of particles or chemicals(1,2) and could play a decisive role in the formation of rain in clouds(3), the accretion process in protoplanetary disks(4), and how animals find their mates or prey(5,6). These and other examples(7) suggest a yet-to-be-determined unifying structure of turbulent flows(8,9). Here, we unveil an important ingredient of turbulence by taking the perspective of an observer who perceives its world with respect to three distant neighbours all swept by the flow. The time evolution of the observer's world can be decomposed into rotation and stretching. We show that, in this Lagrangian frame, the axis of rotation aligns with the initially strongest stretching direction, and that the dynamics can be understood by the conservation of angular momentum. This 'pirouette effect' thus appears as an important structural component of turbulence, and elucidates the mechanism for small-scale generation in turbulence."],["dc.identifier.doi","10.1038/NPHYS2010"],["dc.identifier.isi","000294485400018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22245"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Nature Publishing Group"],["dc.relation.issn","1745-2473"],["dc.title","The pirouette effect in turbulent flows"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Nature Communications"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Buaria, Dhawal"],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.date.accessioned","2021-04-14T08:27:21Z"],["dc.date.available","2021-04-14T08:27:21Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1038/s41467-020-19530-1"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82261"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","2041-1723"],["dc.title","Self-attenuation of extreme events in Navier–Stokes turbulence"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","055102"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Physics of Fluids"],["dc.bibliographiccitation.volume","24"],["dc.contributor.author","Falkovich, Gregory"],["dc.contributor.author","Xu, H."],["dc.contributor.author","Pumir, Alain"],["dc.contributor.author","Bodenschatz, Eberhard"],["dc.contributor.author","Biferale, Luca"],["dc.contributor.author","Boffetta, Guido"],["dc.contributor.author","Lanotte, Alessandra S."],["dc.contributor.author","Toschi, Federico"],["dc.date.accessioned","2018-11-07T09:10:36Z"],["dc.date.available","2018-11-07T09:10:36Z"],["dc.date.issued","2012"],["dc.description.abstract","In turbulence, ideas of energy cascade and energy flux, substantiated by the exact Kolmogorov relation, lead to the determination of scaling laws for the velocity spatial correlation function. Here we ask whether similar ideas can be applied to temporal correlations. We critically review the relevant theoretical and experimental results concerning the velocity statistics of a single fluid particle in the inertial range of statistically homogeneous, stationary and isotropic turbulence. We stress that the widely used relations for the second structure function, D-2(t) equivalent to <[nu(t) - nu(0)](2)> proportional to epsilon t, relies on dimensional arguments only: no relation of D-2(t) to the energy cascade is known, neither in two- nor in three-dimensional turbulence. State of the art experimental and numerical results demonstrate that at high Reynolds numbers, the derivative dD(2)(t)/dt has a finite non-zero slope starting from t approximate to 2 tau(eta). The analysis of the acceleration spectrum Phi(A)(omega) indicates a possible small correction with respect to the dimensional expectation Phi(A)(omega) similar to omega(0) but present data are unable to discriminate between anomalous scaling and finite Reynolds effects in the second order moment of velocity Lagrangian statistics. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4711397]"],["dc.description.sponsorship","US National Science Foundation [NSF PHY05-51164]"],["dc.identifier.doi","10.1063/1.4711397"],["dc.identifier.isi","000304826100028"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26528"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","1089-7666"],["dc.relation.issn","1070-6631"],["dc.title","On Lagrangian single-particle statistics"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]