Publications
168 results found
Dallas V, Vassilicos JC, Hewitt GF, 2010, The Mean Flow Profile of Wall-Bounded Turbulence and Its Relation to Turbulent Flow Topology, 7th International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, Publisher: SPRINGER, Pages: 87-+, ISSN: 1382-4309
Coleman SW, Vassilicos JC, 2009, A unified sweep-stick mechanism to explain particle clustering in two- and three-dimensional homogeneous, isotropic turbulence, PHYSICS OF FLUIDS, Vol: 21, ISSN: 1070-6631
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- Citations: 80
Dallas V, Vassilicos JC, Hewitt GF, 2009, Stagnation point von Karman coefficient, PHYSICAL REVIEW E, Vol: 80, ISSN: 1539-3755
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- Citations: 15
Priego M, Vassilicos JC, 2009, Spectral and particle dispersion properties of steady two-dimensional multiscale flows, PHYSICS OF FLUIDS, Vol: 21, ISSN: 1070-6631
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- Citations: 1
Goto S, Vassilicos JC, 2009, The dissipation rate coefficient of turbulence is not universal and depends on the internal stagnation point structure, PHYSICS OF FLUIDS, Vol: 21, ISSN: 1070-6631
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- Citations: 44
Laizet S, Vassilicos JC, 2009, Direct numerical simulations of turbulent flows generated by regular and fractal grids using an immersed boundary method, Pages: 717-722
Two turbulent flows, one generated by a regular grid and the other by a fractal square grid are studied by means of Direct Numerical Simulations (DNS). An innovative approach which combines high order compact schemes, Immersed Boundary Method and an efficient domain decomposition method is used in this study. Turbulent statistics such as Reynolds stresses are investigated with the objective to analyse the two different regions (production and decay regions) downstream from the grid, as already observed in the experimental results of Hurst & Vassilicos (2007). The main goal of this numerical study is to identify the physical mechanisms implicated in the generation of turbulent flows, especially when generated at different scales, but also to compare the different levels of turbulence intensity generated by each grid.
Laizet S, Vassilicos JC, 2009, Multiscale generation of turbulence, Journal of Multiscale Modeling, Vol: 1, Pages: 177-196, ISSN: 1756-9737
This paper presents a brief but general introduction to the physics and engineering of fractals, followed by a brief introduction to fluid turbulence generated by multiscale flow actuation. Numerical computations of such turbulent flows are now beginning to be possible because of the immersed boundary method (IBM) and terascale parallel high performance computing capabilities. The first-ever direct numerical simulation (DNS) results of turbulence generated by fractal grids are detailed and compared with recent wind tunnel measurements. © 2009 Imperial College Press.
Schwander F, Hascoët E, Vassilicos JC, 2009, Evolution of the acceleration field and a reformulation of the sweeping decorrelation hypothesis in two-dimensional turbulence., Phys Rev E Stat Nonlin Soft Matter Phys, Vol: 79, ISSN: 1539-3755
From simulations of two-dimensional inverse energy cascading turbulence, we show that points with low acceleration values are predominantly advected by the local fluid velocity. The fluid velocity u in the global frame and the fluid velocity u in the frame moving with a low-acceleration point are approximately statistically independent. This property remains valid in high-acceleration regions but only in the direction of the local acceleration vector. In the perpendicular direction, the acceleration velocity V_a=u-xi is approximately independent of xi everywhere. These statistical independences constitute our formulation of the sweeping decorrelation hypothesis for two-dimensional inverse energy cascading turbulence.
Schwander F, Hascoet E, Vassilicos JC, 2009, Evolution of the acceleration field and a reformulation of the sweeping decorrelation hypothesis in two-dimensional turbulence, PHYSICAL REVIEW E, Vol: 79, ISSN: 1539-3755
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- Citations: 2
Faber T, Vassilicos JC, 2009, Turbulent pair separation due to multiscale stagnation point structure and its time asymmetry in two-dimensional turbulence, PHYSICS OF FLUIDS, Vol: 21, ISSN: 1070-6631
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- Citations: 14
Stresing R, Peinke J, Seoud RE, et al., 2009, Multi-scale correlations in regular and fractal-generated turbulence, 12th EUROMECH European Turbulence Conference, Publisher: SPRINGER-VERLAG BERLIN, Pages: 711-714, ISSN: 0930-8989
Dallas V, Vassilicos JC, 2009, Stagnation point von Karman coefficient, Phys. Rev. E, Vol: 80
Nicolleau F, Sung K-S, Vassilicos JC, 2008, Depletion of horizontal pair diffusion in strongly stratified turbulence: Comparison with plane two-dimensional flows, PHYSICAL REVIEW E, Vol: 78, ISSN: 1539-3755
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- Citations: 2
Coleman SW, Vassilicos JC, 2008, Transport properties of saturated and unsaturated porous fractal materials, PHYSICAL REVIEW LETTERS, Vol: 100, ISSN: 0031-9007
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- Citations: 45
Nicolleau F, Yu G, Vassilicos JC, 2008, Kinematic simulation for stably stratified and rotating turbulence, FLUID DYNAMICS RESEARCH, Vol: 40, Pages: 68-93, ISSN: 0169-5983
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- Citations: 8
Mazellier N, Vassilicos JC, 2008, The turbulence dissipation constant is not universal because of its universal dependence on large-scale flow topology, PHYSICS OF FLUIDS, Vol: 20, ISSN: 1070-6631
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- Citations: 48
Coleman, SW & Vassilicos JC, 2008, Tortuosity of saturated and unsaturated porous fractal materials., Phys. Rev. Lett., Vol: 100
Ferrari S, Kewcharoenwong P, Rossi L, et al., 2008, Multi-scale flow control for efficient mixing: laboratory generation of unsteady multi-scale flows controlled by multi-scale electromagnetic forces, IUTAM symposium on flow control and MEMS, Publisher: springer, Pages: 267-272
Seoud REE, Vassilicos JC, 2008, Passive multiscale flow control by fractal grids, IUTAM Symposium on Flow Control and MEMS, Publisher: SPRINGER, Pages: 421-425
Hascoet E, Rossi L, Vassilicos JC, 2008, Multi-scale flow control for efficient mixing: simulation of electromagnetically forced turbulent-like laminar flows, IUTAM symposium on flow control and MEMS, Publisher: springer, Pages: 273-277
Goto, S and Vassilicos JC, 2008, The sweep-stick mechanism of heavy particle clustering in fluidturbulence., Physical Review Letters
Ferrari S, rossi L, Vassilicos JC, 2007, Acceleration measurements in turbulent-like flows, ETC11
Nicolleau F, Yu G, Vassilicos JC, 2007, Simulation for stably stratified and rapidly rotating turbulence., Fluid Dyn. Res, Vol: 40, Pages: 68-93
Seoud RE, Vassilicos JC, 2007, Dissipation and decay of fractal-generated turbulence., Phys. Fluids, Vol: 19
Martinand D, Vassilicos JC, 2007, Fast chemical reaction and multiple-scale concentration fields in singular vortices, Phys. Rev. E, Vol: 75
Kewcharoenwong P, rossi L, Vassilicos JC, 2007, Diffusion in time-dependent laminar flows with multi-scale Eulerian flow topology, ETC11
Hurst D, Vassilicos JC, 2007, Scalings and decay of fractal-generated turbulence, PHYSICS OF FLUIDS, Vol: 19, Pages: 035103-1-035103-31, ISSN: 1070-6631
Rossi L, Vassilicos JC, Hardalupas Y, 2007, Eulerian-Lagrangian aspects of a steady multi-scale laminar flow, Phys. Fluids, Vol: 19
Schwander F, Hascoet E, Vassilicos JC, 2007, Statistics of acceleration field motions in 2D inverse-cascading turbulence, 11th EUROMECH European Turbulence Conference, Publisher: SPRINGER-VERLAG BERLIN, Pages: 526-528, ISSN: 0930-8989
Seoud REE, Vassilicos JC, 2007, Turbulence generated by fractal grids in the wind tunnel, 11th EUROMECH European Turbulence Conference, Publisher: SPRINGER-VERLAG BERLIN, Pages: 653-+, ISSN: 0930-8989
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