Zobrazeno 1 - 10
of 126
pro vyhledávání: '"Craske, John"'
Autor:
Craske, John, Mannix, Paul
A partial differential equation governing the global evolution of the joint probability distribution of an arbitrary number of local flow observations, drawn randomly from a control volume, is derived and applied to examples involving irreversible mi
Externí odkaz:
http://arxiv.org/abs/2408.08028
We consider an internally heated fluid between parallel plates with fixed thermal fluxes. For a large class of heat sources that vary in the direction of gravity, we prove that $\langle\delta T \rangle_h \geq \sigma R^{-1/3} - \mu$, where $\langle\de
Externí odkaz:
http://arxiv.org/abs/2402.19240
We propose a dynamical systems approach to show how multizone models in buildings can be simplified upon recognising the existence of fast and slow modes of response. The study is motivated by extensive observations from an instrumented classroom equ
Externí odkaz:
http://arxiv.org/abs/2306.03183
Autor:
Andrian, Veronica, Craske, John
Publikováno v:
Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 479, 20230170 (2023)
Stochastic versions of a classical model for natural ventilation are proposed and investigated to demonstrate the effect of random fluctuations on stability and predictability. In a stochastic context, the well-known deterministic result that ventila
Externí odkaz:
http://arxiv.org/abs/2303.02068
New bounds are proven on the mean vertical convective heat transport, $\overline{\langle wT \rangle}$, for uniform internally heated (IH) convection in the limit of infinite Prandtl number. For fluid in a horizontally-periodic layer between isotherma
Externí odkaz:
http://arxiv.org/abs/2205.03175
We obtain an analytical bound on the mean vertical convective heat flux $\langle w T \rangle$ between two parallel boundaries driven by uniform internal heating. We consider two configurations, one with both boundaries held at the same constant tempe
Externí odkaz:
http://arxiv.org/abs/2110.10344
Publikováno v:
J. Fluid Mech. 922 (2021) R1
We prove a new rigorous bound for the mean convective heat transport $\langle w T \rangle$, where $w$ and $T$ are the nondimensional vertical velocity and temperature, in internally heated convection between an insulating lower boundary and an upper
Externí odkaz:
http://arxiv.org/abs/2103.16498
Publikováno v:
J. Fluid Mech. 919 (2021) A15
The mean vertical heat transport $\langle wT \rangle$ in convection between isothermal plates driven by uniform internal heating is investigated by means of rigorous bounds. These are obtained as a function of the Rayleigh number $R$ by constructing
Externí odkaz:
http://arxiv.org/abs/2102.06458
Publikováno v:
J. Fluid Mech. 908 (2021) A12
We present a mathematical description of turbulent entrainment that is applicable to free shear problems that evolve in space, time or both. Defining the global entrainment velocity $\overline V_g$ to be the fluid motion across an isosurface of an av
Externí odkaz:
http://arxiv.org/abs/1910.06698
Autor:
Craske, John, Hughes, Graham O.
We determine the smallest instantaneous increase in the strength of an opposing wind that is necessary to permanently reverse the forward displacement flow that is driven by a two-layer thermal stratification. With an interpretation in terms of the f
Externí odkaz:
http://arxiv.org/abs/1808.08132