Zobrazeno 1 - 10
of 169
pro vyhledávání: '"Perlekar, Prasad"'
Autor:
Bees, Martin A., Perlekar, Prasad
Bioconvection is the prototypical active matter system for hydrodynamic instabilities and pattern formation in suspensions of biased swimming microorganisms, particularly at the dilute end of the concentration spectrum where cell-cell interactions ty
Externí odkaz:
http://arxiv.org/abs/2405.17256
We discover an instability mechanism in suspensions of self-propelled particles that does not involve active stress. Instead, it is driven by a subtle interplay of inertia, swimmer motility, and concentration fluctuations, through a crucial time lag
Externí odkaz:
http://arxiv.org/abs/2401.11927
Elastic turbulence is the chaotic fluid motion resulting from elastic instabilities due to the addition of polymers in small concentrations at very small Reynolds ($\mbox{Re}$) numbers. Our direct numerical simulations show that elastic turbulence, t
Externí odkaz:
http://arxiv.org/abs/2308.06997
Autor:
Rana, Navdeep, Chatterjee, Rayan, Ro, Sunghan, Levine, Dov, Ramaswamy, Sriram, Perlekar, Prasad
We study the effects of inertia in dense suspensions of polar swimmers. The hydrodynamic velocity field and the polar order parameter field describe the dynamics of the suspension. We show that a dimensionless parameter $R$ (ratio of the swimmer self
Externí odkaz:
http://arxiv.org/abs/2305.15197
We present direct numerical simulations (DNS) study of confined buoyancy-driven bubbly flows in a Hele-Shaw setup. We investigate the spectral properties of the flow and make comparisons with experiments. The energy spectrum obtained from the gap-ave
Externí odkaz:
http://arxiv.org/abs/2212.04989
We investigate spectral properties of buoyancy driven bubbly flows. Using high-resolution numerical simulations and phenomenology of homogeneous turbulence, we identify the relevant energy transfer mechanisms. We find: (a) At high enough Galilei numb
Externí odkaz:
http://arxiv.org/abs/2204.04505
We use direct numerical simulations to study homogeneous, and isotropic turbulent flows of dilute polymer solutions at high Reynolds and Deborah numbers. We find that for small wavenumbers $k$, the kinetic energy spectrum shows Kolmogorov--like behav
Externí odkaz:
http://arxiv.org/abs/2111.11224
The rate of collision and the relative velocities of the colliding particles in turbulent flows is a crucial part of several natural phenomena, e.g., rain formation in warm clouds and planetesimal formation in a protoplanetary disks. The particles ar
Externí odkaz:
http://arxiv.org/abs/2110.02568
We use direct numerical simulations and scaling arguments to study coarsening in binary fluid mixtures with a conserved order parameter in the droplet-spinodal regime -- the volume fraction of the droplets is neither too small nor symmetric -- for sm
Externí odkaz:
http://arxiv.org/abs/2109.09671
Autor:
Rana, Navdeep, Perlekar, Prasad
We investigate phase ordering dynamics of the incompressible Toner-Tu equation in three dimensions. We show that the phase ordering proceeds via defect merger events and the dynamics is controlled by the Reynolds number Re. At low Re, the dynamics is
Externí odkaz:
http://arxiv.org/abs/2106.03383