Lerner, Edan, Procaccia, Itamar, Ching, Emily S. C., Hentschel, H. G. E
The shear-modulus and yield-stress of amorphous solids are important material parameters, with the former determining the rate of increase of stress under external strain and the latter being the...
Ultimate-state scaling in a shell model for homogeneous turbulent convection (2008)
An interesting question in turbulent convection is how the heat transport depends on the strength of thermal forcing in the limit of very large thermal forcing. Kraichnan predicted [Phys. Fluids {\bf...
Refined similarity hypotheses in shell models of turbulence (2008)
Ching, Emily S. C., Guo, H., Lo, T. S.
A major challenge in turbulence research is to understand from first principles the origin of anomalous scaling of the velocity fluctuations in high-Reynolds-number turbulent flows. One important...
Ching, Emily S. C., Guo, H., Cheng, W. C.
Different scaling behavior has been reported in various shell models proposed for turbulent thermal convection. In this paper, we show that buoyancy is not always relevant to the statistical...
Ching, Emily S. C., Cheng, W. C.
Anomalous scaling in the statistics of an active scalar in homogeneous turbulent convection is studied using a dynamical shell model. We extend refined similarity ideas for homogeneous and isotropic...
Benzi, Roberto, Ching, Emily S. C., De Angelis, Elisabetta, Procaccia, Itamar
Numerical simulations of turbulent channel flows, with or without additives, are limited in the extent of the Reynolds number \Re and Deborah number \De. The comparison of such simulations to...
Multifractality and scale invariance in human heartbeat dynamics (2007)
Ching, Emily S. C., Tsang, Yue-Kin
Human heart rate is known to display complex fluctuations. Evidence of multifractality in heart rate fluctuations in healthy state has been reported [Ivanov et al., Nature {\bf 399}, 461 (1999)]....
Ching, Emily S. C., Lo, T. S., Procaccia, Itamar
Drag reduction by polymers is bounded between two universal asymptotes, the von-K\'arm\'an log-law of the law and the Maximum Drag Reduction (MDR) asymptote. It is theoretically understood why the...
Additive Equivalence in Turbulent Drag Reduction by Flexible and Rodlike Polymers (2005)
Benzi, Roberto, Ching, Emily S. C., Lo, T. S., L'vov, Victor S., Procaccia, Itamar
We address the "Additive Equivalence" discovered by Virk and coworkers: drag reduction affected by flexible and rigid rodlike polymers added to turbulent wall-bounded flows is limited from above by a...
Drag Reduction in Homogeneous Turbulence by Scale-Dependent Effective Viscosity (2004)
Benzi, Roberto, Ching, Emily S. C., Procaccia, Itamar
The phenomenon of drag reduction by polymer additives had been studied in simulations on the basis of non-Newtonian fluid mechanical models that take into account the field of polymer extension...
Hierarchical Structure in Healthy and Diseased Heart Rate Variability in Humans (2003)
Ching, Emily S. C., Lin, D. C., Zhang, C.
It is shown that the heart rate variability (HRV) in healthy and diseased humans possesses a hierarchical structure of the She-Leveque (SL) form. This structure, first found in measurements in...
Extraction of Plumes in Turbulent Thermal Convection (2003)
Ching, Emily S. C., Guo, H., Shang, Xiao-Dong, Tong, P., Xia, Ke-Qing
We present a scheme to extract information about plumes, a prominent coherent structure in turbulent thermal convection, from simultaneous local velocity and temperature measurements. Using this...
Ching, Emily S. C., Cohen, Yoram, Gilbert, Thomas, Procaccia, Itamar
We have recently proposed that the statistics of active fields (which affect the velocity field itself) in well-developed turbulence are also dominated by the Statistically Preserved Structures of...
Extended Self-Similarity and Hierarchical Structure in Turbulence (2001)
Ching, Emily S. C., She, Zhen-Su, Su, Weidong, Zou, Zhengping
It is shown that the two remarkable properties of turbulence, the Extended Self-Similarity (ESS) [R. Benzi {\it et al.}, Phy. Rev. E {\bf 48}, R29, (1993)] and the She-Leveque Hierarchical Structure...
Dependence of heat transport on the strength and shear rate of prescribed circulating flows (2001)
Ching, Emily S. C., Pang, K. M.
We study numerically the dependence of heat transport on the maximum velocity and shear rate of physical circulating flows, which are prescribed to have the key characteristics of the large-scale...
Statistically Preserved Structures and Anomalous Scaling in Turbulent Active Scalar Advection (2001)
Ching, Emily S. C., Cohen, Yoram, Gilbert, Thomas, Procaccia, Itamar
The anomalous scaling of correlation functions in the turbulent statistics of active scalars (like temperature in turbulent convection) is understood in terms of an auxiliary passive scalar which is...
Conditional statistics of temperature fluctuations in turbulent convection (2001)
Ching, Emily S. C., Chau, K. L.
We find that the conditional statistics of temperature difference at fixed values of the locally averaged temperature dissipation rate in turbulent convection become Gaussian in the regime where the...
Energy dependence of mass distributions in fragmentation (1998)
Ching, Emily S. C., Yiu, Y. Y., Lo, K. F.
We study fragmentation numerically using a simple model in which an object is taken to be a set of particles that interact pairwisely via a Lennard-Jones potential while the effect of the...
On Conditional Statistics in Scalar Turbulence: Theory vs. Experiment (1996)
Ching, Emily S. C., L'vov, Victor S., Podivilov, Evgeni, Procaccia, Itamar
We consider turbulent advection of a scalar field $T(\B.r)$, passive or active, and focus on the statistics of gradient fields conditioned on scalar differences $\Delta T(R)$ across a scale $R$. In...
Fusion Rules and Conditional Statistics in Turbulent Advection (1996)
Ching, Emily S. C., L'vov, Victor S., Procaccia, Itamar
Fusion rules in turbulence address the asymptotic properties of many-point correlation functions when some of the coordinates are very close to each other. Here we put to experimental test some...
Stability Limit for Mode-I Fracture (1994)
Ching, Emily S. C., Langer, J. S.
In order to study the stability of mode-I fracture, we consider a crack moving along the centerline of a very wide strip and compute its steady-state response to a small, spatially periodic shear...