Zobrazeno 1 - 10
of 950
pro vyhledávání: '"Pumir, A."'
The transport of matter by turbulent flows plays an important role, in particular in a geophysical context. Here, we study the relative movement of groups of two (pairs) and four (tetrahedra) Lagrangian particles using direct numerical simulations of
Externí odkaz:
http://arxiv.org/abs/2410.12745
Representing the glaciation of mixed-phase clouds in terms of the Wegener-Bergeron-Findeisen process is a challenge for many weather and climate models, which tend to overestimate this process because cloud dynamics and microphysics are not accuratel
Externí odkaz:
http://arxiv.org/abs/2410.06724
Small particles are transported over long distances in the atmosphere, with significant environmental impact. The transport of symmetric particles is well understood, but atmospheric particles, such as curved microplastic fibres or ash particles, are
Externí odkaz:
http://arxiv.org/abs/2409.19004
Autor:
Rivaud, Stéphane, Fournier, Louis, Pumir, Thomas, Belilovsky, Eugene, Eickenberg, Michael, Oyallon, Edouard
Reversible architectures have been shown to be capable of performing on par with their non-reversible architectures, being applied in deep learning for memory savings and generative modeling. In this work, we show how reversible architectures can sol
Externí odkaz:
http://arxiv.org/abs/2406.02052
Publikováno v:
Phys. Rev. Lett. 133, 024101 (2024)
Turbulence in stratified and rotating turbulent flows is characterized by an interplay between waves and eddies, resulting in continuous exchanges between potential and kinetic energy. Here, we study how these processes affect the turbulent energy ca
Externí odkaz:
http://arxiv.org/abs/2401.14779
We discuss a model for directed percolation in which the flux of material along each bond is a dynamical variable. The model includes a physically significant limiting case where the total flux of material is conserved. We show that the distribution
Externí odkaz:
http://arxiv.org/abs/2310.01933
Publikováno v:
Phys. Rev. Lett. 131 (2023) 254201
Evaporation of cloud droplets accelerates when turbulence mixes dry air into the cloud, affecting droplet-size distributions in atmospheric clouds, combustion sprays, and jets of exhaled droplets. The challenge is to model local correlations between
Externí odkaz:
http://arxiv.org/abs/2309.03055
Autor:
Buaria, Dhawal, Pumir, Alain
We investigate the role of pressure, via its Hessian tensor $\mathbf{H}$, on amplification of vorticity and strain-rate and contrast it with other inviscid nonlinear mechanisms. Results are obtained from direct numerical simulations of isotropic turb
Externí odkaz:
http://arxiv.org/abs/2308.03902
Autor:
Bhowmick, T., Seesing, J., Gustavsson, K., Guettler, J., Wang, Y., Pumir, A., Mehlig, B., Bagheri, G.
Publikováno v:
Physical Review Letters 132.3 (2024): 034101
The orientation of non-spherical particles in the atmosphere, such as volcanic ash and ice crystals, influences their residence times, and the radiative properties of the atmosphere. Here, we demonstrate experimentally that the orientation of heavy s
Externí odkaz:
http://arxiv.org/abs/2303.04299
We derive from first principles analytic relations for the second and third order moments of the velocity gradient mij = dui/dxj in compressible turbulence, which generalize known relations in incompressible flows. These relations, although derived f
Externí odkaz:
http://arxiv.org/abs/2205.05946