129 citations · 656 across the 25 of their papers we have counts for
24 papers
Scalar dissipation anomaly and scalar-gradient scaling in turbulence: A joint velocity-scalar multifractal view
Dhawal Buaria
We revisit the problem of scalar dissipation anomaly and scaling of scalar gradients in passive scalar turbulence using theory and data from well-resolved direct numerical simulati…
Scalar gradient structure and dynamics in turbulent mixing at high Reynolds and Schmidt numbers
Ruqaiya Islam Mishi, Dhawal Buaria
How well turbulence mixes a scalar is governed by the scalar dissipation rate , making scalar gradients central to turbulent mixing. We study the structure a…
Unified multifractal description of longitudinal and transverse intermittency in fully developed turbulence
Dhawal Buaria
Small-scale intermittency is a defining feature of fully developed fluid turbulence, marked by rare and extreme fluctuations of velocity increments and gradients that defy mean-fie…
Universality of extreme events in turbulent flows
Dhawal Buaria, Alain Pumir
The universality of small scales, a cornerstone of turbulence, has been nominally confirmed for low-order mean-field statistics, such as the energy spectrum. However, small scales…
Twisting vortex lines regularize Navier-Stokes turbulence
Dhawal Buaria, John M. Lawson, Michael Wilczek
Fluid flows are intrinsically characterized via the topology and dynamics of underlying vortex lines. Turbulence in common fluids like water and air, mathematically described by th…
Role of pressure in generation of intense velocity gradients in turbulent flows
Dhawal Buaria, Alain Pumir
We investigate the role of pressure, via its Hessian tensor , on amplification of vorticity and strain-rate and contrast it with other inviscid nonlinear mechanisms. Re…
Saturation and multifractality of Lagrangian and Eulerian scaling exponents in 3D isotropic turbulence
Dhawal Buaria, Katepalli R. Sreenivasan
Inertial range scaling exponents for both Lagrangian and Eulerian structure functions are obtained from direct numerical simulations of isotropic turbulence in triply periodic doma…
Forecasting small scale dynamics of fluid turbulence using deep neural networks
Dhawal Buaria, Katepalli R. Sreenivasan
Turbulent flows consist of a wide range of interacting scales. Since the scale range increases as some power of the flow Reynolds number, a faithful simulation of the entire scale…
Comparing velocity and passive scalar statistics in fluid turbulence at high Schmidt numbers and Reynolds numbers
Dhawal Buaria, Katepalli R. Sreenivasan
Recently, Shete et al. [Phys. Rev. Fluids 7, 024601 (2022)] explored the characteristics of passive scalars in the presence of a uniform mean gradient, mixed by stationary isotropi…
Role of initial separation for Richardson scaling of turbulent two-particle dispersion
Dhawal Buaria
The role of initial separation for inertial range scaling of turbulent two-particle dispersion is reassessed in light of recent results. (slightly expanded version of Comment publi…
Lagrangian acceleration in fully developed turbulence and its Eulerian decompositions
Dhawal Buaria, Katepalli R. Sreenivasan
We study the properties of various Eulerian contributions to fluid particle acceleration by using well-resolved direct numerical simulations of isotropic turbulence, with the grid…
Intermittency of turbulent velocity and scalar fields using 3D local averaging
Dhawal Buaria, Katepalli R. Sreenivasan
An efficient approach for extracting 3D local averages in spherical subdomains is proposed and applied to study the intermittency of small-scale velocity and scalar fields in direc…
Vorticity-strain rate dynamics and the smallest scales of turbulence
Dhawal Buaria, Alain Pumir
Building upon the intrinsic properties of Navier-Stokes dynamics, namely the prevalence of intense vortical structures and the interrelationship between vorticity and strain rate,…
Scaling of acceleration statistics in high Reynolds number turbulence
Dhawal Buaria, Katepalli R. Sreenivasan
The scaling of acceleration statistics in turbulence is examined by combining data from the literature with new data from well-resolved direct numerical simulations of isotropic tu…
Generation of intense dissipation in high Reynolds number turbulence
Dhawal Buaria, Alain Pumir, Eberhard Bodenschatz
Intense fluctuations of energy dissipation rate in turbulent flows result from the self-amplification of strain rate via a quadratic nonlinearity, with contributions from vorticity…
Non-local amplification of intense vorticity in turbulent flows
Dhawal Buaria, Alain Pumir
The nonlinear and nonlocal coupling of vorticity and strain-rate constitutes a major hindrance in understanding the self-amplification of velocity gradients in turbulent fluid flow…
Self-attenuation of extreme events in Navier-Stokes turbulence
Dhawal Buaria, Alain Pumir, Eberhard Bodenschatz
Turbulent fluid flows are ubiquitous in nature and technology, and are mathematically described by the incompressible Navier-Stokes equations (INSE). A hallmark of turbulence is sp…
Vortex stretching and enstrophy production in high Reynolds number turbulence
Dhawal Buaria, Eberhard Bodenschatz, Alain Pumir
An essential ingredient of turbulent flows is the vortex stretching mechanism, which emanates from the non-linear interaction of vorticity and strain-rate tensor and leads to forma…
A highly scalable particle tracking algorithm using partitioned global address space (PGAS) programming for extreme-scale turbulence simulations
Dhawal Buaria, P. K. Yeung
A new parallel algorithm utilizing partitioned global address space (PGAS) programming model to achieve high scalability is reported for particle tracking in direct numerical simul…
Small-scale isotropy and ramp-cliff structures in scalar turbulence
Dhawal Buaria, Matthew P. Clay, Katepalli R. Sreenivasan +1
Passive scalars advected by three-dimensional Navier-Stokes turbulence exhibit a fundamental anomaly in odd-order moments because of the characteristic ramp-cliff structures, viola…
Dissipation range of the energy spectrum in high Reynolds number turbulence
Dhawal Buaria, Katepalli R. Sreenivasan
We seek to understand the kinetic energy spectrum in the dissipation range of fully developed turbulence. The data are obtained by direct numerical simulations (DNS) of forced Navi…
Turbulence is an ineffective mixer when Schmidt numbers are large
Dhawal Buaria, Matthew P. Clay, Katepalli R. Sreenivasan +1
We solve the advection-diffusion equation for a stochastically stationary passive scalar , in conjunction with forced 3D Navier-Stokes equations, using direct numerical simulati…
Single-particle Lagrangian statistics from direct numerical simulations of rotating-stratified turbulence
Dhawal Buaria, Alain Pumir, Fabio Feraco +4
Geophysical fluid flows are predominantly turbulent and often strongly affected by the Earth's rotation, as well as by stable density stratification. Using direct numerical simulat…
Extreme velocity gradients in turbulent flows
Dhawal Buaria, Alain Pumir, Eberhard Bodenschatz +1
Fully turbulent flows are characterized by intermittent formation of very localized and intense velocity gradients. These gradients can be orders of magnitude larger than their typ…