Zobrazeno 1 - 10
of 295
pro vyhledávání: '"Johnson, Perry"'
Publikováno v:
Physical Review Fluids 2, no. 10 (2017): 104603
We present an analysis of the Navier-Stokes equations based on a spatial filtering technique to elucidate the multi-scale nature of fully developed turbulence. In particular, the advection of a band-pass-filtered small-scale contribution by larger sc
Externí odkaz:
http://arxiv.org/abs/2307.11195
In homogeneous and isotropic turbulence, the relative contributions of different physical mechanisms to the energy cascade can be quantified by an exact decomposition of the energy flux (P. Johnson, Phys. Rev. Lett., 124, 104501 (2020), J. Fluid Mech
Externí odkaz:
http://arxiv.org/abs/2301.04193
Publikováno v:
In Radiotherapy and Oncology October 2024 199
Autor:
Park, Jiyeon, Reiners, Keaton, Wei Ho, Meng, Huh, Soon, Liu, Chunbo, Johnson, Perry, Zhang, Yawei
Publikováno v:
In Physica Medica September 2024 125
Autor:
Elnahhas, Ahmed, Johnson, Perry L.
Turbulence enhances the wall shear stress in boundary layers, significantly increasing the drag on streamlined bodies. Other flow features such as freestream pressure gradients and streamwise boundary layer growth also strongly influence the skin fri
Externí odkaz:
http://arxiv.org/abs/2107.03043
Autor:
Johnson, Perry L.
Large-eddy simulations (LES) are widely-used for computing high Reynolds number turbulent flows. Spatial filtering theory for LES is not without its shortcomings, including how to define filtering for wall-bounded flows, commutation errors for non-un
Externí odkaz:
http://arxiv.org/abs/2106.06179
Autor:
Johnson, Perry L.
The tendency of turbulent flows to produce fine-scale motions from large-scale energy injection is often viewed as a scale-wise cascade of kinetic energy driven by vorticity stretching. This has been recently evaluated by an exact, spatially-local re
Externí odkaz:
http://arxiv.org/abs/2102.06844
Knowledge of bubble and drop size distributions in two-phase flows is important for characterizing a wide range of phenomena, including combustor ignition, sonar communication, and cloud formation. The physical mechanisms driving the background flow
Externí odkaz:
http://arxiv.org/abs/2011.07243
Breaking waves generate a distribution of bubble sizes that evolves over time. Knowledge of how this distribution evolves is of practical importance for maritime and climate studies. The analytical framework developed in Part 1 examined how this evol
Externí odkaz:
http://arxiv.org/abs/2009.04804
Publikováno v:
J. Fluid Mech. 912 (2021) A42
Breaking waves entrain gas beneath the surface. The wave-breaking process energizes turbulent fluctuations that break bubbles in quick succession to generate a wide range of bubble sizes. Understanding this generation mechanism paves the way towards
Externí odkaz:
http://arxiv.org/abs/2008.12883