Miguel Beneitez
YOU?
Author Swipe
View article: Linear instability in planar viscoelastic Taylor–Couette flow with and without explicit polymer diffusion
Linear instability in planar viscoelastic Taylor–Couette flow with and without explicit polymer diffusion Open
Elastic turbulence has been found in computations of planar viscoelastic Taylor-Couette flow using the Oldroyd-B model, apparently generated by a linear instability (van Buel et al. Europhys. Lett., 124, 14001, 2018). We demonstrate that n…
View article: Transition route to elastic and elasto-inertial turbulence in polymer channel flows
Transition route to elastic and elasto-inertial turbulence in polymer channel flows Open
Viscoelastic shear flows support additional chaotic states beyond simple Newtonian turbulence. In vanishing Reynolds number flows, the nonlinearity in the polymer evolution equation alone can sustain inertialess “elastic” turbulence (ET) w…
View article: The Well: a Large-Scale Collection of Diverse Physics Simulations for Machine Learning
The Well: a Large-Scale Collection of Diverse Physics Simulations for Machine Learning Open
Machine learning based surrogate models offer researchers powerful tools for accelerating simulation-based workflows. However, as standard datasets in this space often cover small classes of physical behavior, it can be difficult to evalua…
View article: Transition route to elastic and elasto-inertial turbulence in polymer channel flows
Transition route to elastic and elasto-inertial turbulence in polymer channel flows Open
Viscoelastic shear flows support additional chaotic states beyond simple Newtonian turbulence. In vanishing Reynolds number flows, the nonlinearity in the polymer evolution equation alone can sustain inertialess 'elastic' turbulence (ET) w…
View article: Multistability of elasto-inertial two-dimensional channel flow
Multistability of elasto-inertial two-dimensional channel flow Open
Elasto-inertial turbulence (EIT) is a recently discovered two-dimensional chaotic flow state observed in dilute polymer solutions. Two possibilities are currently hypothesized to be linked to the dynamical origins of EIT: (i) viscoelastic …
View article: Inertial enhancement of the polymer diffusive instability
Inertial enhancement of the polymer diffusive instability Open
Beneitez et al. ( Phys. Rev. Fluids , vol. 8, 2023, L101901) have recently discovered a new linear ‘polymer diffusive instability’ (PDI) in inertialess rectilinear viscoelastic shear flow using the finitely extensible nonlinear elastic con…
View article: Inertial enhancement of the polymer diffusive instability
Inertial enhancement of the polymer diffusive instability Open
Beneitez et al. (Phys. Rev. Fluids, 8, L101901, 2023) have recently discovered a new linear “polymer diffusive instability” (PDI) in inertialess rectilinear viscoelastic shear flow using the FENE-P model when polymer stress diffusion is pr…
View article: Universal Free-Fall Law for Liquid Jets under Fully Developed Injection Conditions
Universal Free-Fall Law for Liquid Jets under Fully Developed Injection Conditions Open
We show that vertical slender jets of liquid injected in air with a fully developed outlet velocity profile have a universal shape in the common case in which the viscous force is much smaller than the gravitational force. The theory of id…
View article: Universal Free-Fall Law for Liquid Jets under Fully Developed Injection Conditions
Universal Free-Fall Law for Liquid Jets under Fully Developed Injection Conditions Open
We show that vertical slender jets of liquid injected in air with a fully-developed outlet velocity profile have a universal shape in the common case in which the viscous force is much smaller than the gravitational force. The theory of id…
View article: Polymer diffusive instability leading to elastic turbulence in plane Couette flow
Polymer diffusive instability leading to elastic turbulence in plane Couette flow Open
Elastic turbulence is a chaotic flow state observed in dilute polymer solutions in the absence of inertia. It was discovered experimentally in circular geometries and has long been thought to require a finite amplitude perturbation in para…
View article: Instability of the optimal edge trajectory in the Blasius boundary layer
Instability of the optimal edge trajectory in the Blasius boundary layer Open
In the context of linear stability analysis, considering unsteady base flows is notoriously difficult. A generalisation of modal linear stability analysis, allowing for arbitrarily unsteady base flows over a finite time, is therefore requi…
View article: Multistability of elasto-inertial two-dimensional channel flow
Multistability of elasto-inertial two-dimensional channel flow Open
Elasto-inertial turbulence (EIT) is a recently discovered two-dimensional chaotic flow state observed in dilute polymer solutions. It has been hypothesised that the dynamical origins of EIT are linked to a center-mode instability, whose no…
View article: Instability of the optimal edge trajectory in the Blasius boundary layer
Instability of the optimal edge trajectory in the Blasius boundary layer Open
In the context of linear stability analysis, considering unsteady base flows is notoriously difficult. A generalisation of modal linear stability analysis, allowing for arbitrarily unsteady base flows over a finite time, is therefore requi…
View article: Finite-amplitude elastic waves in viscoelastic channel flow from large to zero Reynolds number
Finite-amplitude elastic waves in viscoelastic channel flow from large to zero Reynolds number Open
Using branch continuation in the FENE-P model, we show that finite-amplitude travelling waves borne out of the recently discovered linear instability of viscoelastic channel flow (Khalid et al. , J. Fluid Mech. , vol. 915, 2021, A43) are s…
View article: Polymeric diffusive instability leading to elastic turbulence in plane Couette flow
Polymeric diffusive instability leading to elastic turbulence in plane Couette flow Open
Elastic turbulence is a chaotic flow state observed in dilute polymer solutions in the absence of inertia. It was discovered experimentally in circular geometries and has long been thought to require a finite amplitude perturbation in para…
View article: Finite-amplitude elastic waves in viscoelastic channel flow from large to zero Reynolds number
Finite-amplitude elastic waves in viscoelastic channel flow from large to zero Reynolds number Open
Using branch continuation in the FENE-P model, we show that finite-amplitude travelling waves borne out of the recently-discovered linear instability of viscoelastic channel flow (Khalid et al. {\em J. Fluid Mech.} {\bf 915}, A43, 2021) ar…
View article: Transient linear stability of pulsating Poiseuille flow using optimally time-dependent modes
Transient linear stability of pulsating Poiseuille flow using optimally time-dependent modes Open
Time-dependent flows are notoriously challenging for classical linear stability analysis. Most progress in understanding the linear stability of these flows has been made for time-periodic flows via Floquet theory focusing on time-asymptot…
View article: Modeling the collapse of the edge when two transition routes compete
Modeling the collapse of the edge when two transition routes compete Open
The transition to turbulence in many shear flows proceeds along two competing routes, one linked with finite-amplitude disturbances and the other one originating from a linear instability, as in, e.g., boundary layer flows. The dynamical s…
View article: Optimal perturbations and transition energy thresholds in boundary layer shear flows
Optimal perturbations and transition energy thresholds in boundary layer shear flows Open
Subcritical transition to turbulence in spatially developing boundary layer flows can be triggered efficiently by finite amplitude perturbations. In this work, we employ adjoint-based optimization to identify optimal initial perturbations …
View article: Turbulent flow control via nature inspired surface modifications
Turbulent flow control via nature inspired surface modifications Open
Many of the flows in nature are turbulent. To modify turbulent flows, nature serves itself with different types of coatings. Sharks have riblets-like structures on their skin, fishes have slime with polymers and the surface of the lotus fl…