Development of smoothed particle hydrodynamics method for modeling active nematics

Saghatchi, Roozbeh; Kolukısa, Deniz Can; Yıldız, Mehmet

doi:10.1002/nme.7116

Cited by 5 publications

(4 citation statements)

References 66 publications

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“…54 With time, the nematic orientation gradually changes owing to activity-induced bulk instabilities, and subsequently, an active turbulent flow appears. 49 It takes 1 Â 10 5 steps to stabilize the evolution of the flow field, after which we begin recording the motion information of the particles. Following this initial period, we are able to capture the characteristics of turbulence and compute the kinetic spectrum for the active flows.…”

Section: Resultsmentioning

confidence: 99%

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On particle motion in a confined square domain filled with active fluids

Ye,

Ouyang,

Lin

2024

Soft Matter

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Section: Resultsmentioning

confidence: 99%

“…Notably, an active nematic fluid usually falls into the viscous flow regime, wherein the active force dominates the elastic force. 49 Hence, the stress tensor can usually be simplified in the following form:…”

Section: Numerical Modelmentioning

confidence: 99%

On particle motion in a confined square domain filled with active fluids

Ye,

Ouyang,

Lin

2024

Soft Matter

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“…Here is the generalized nonlinear advection term which is controlled by tumbling parameter (), and stands for the molecular field, which relates the relaxation of to the minimum of the free energy () and it is controlled by the rotational diffusivity (). Free energy, , includes two parts, elastic and bulk free energies, which are regulated by elastic constant () and the coefficient , respectively (Saghatchi, Kolukisa & Yildiz 2022 a ).…”

Section: Methodsmentioning

confidence: 99%

Vibration induced by active nematics

Saghatchi

Yıldız²

2023

J. Fluid Mech.

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Active elements in active nematics can impose forces on immersed bodies and move them accordingly. We numerically investigate the vibrational motion of a cantilever beam placed in active nematics. The continuous energy transfer from vortices to the beam results in beam oscillation, whose direction and amplitude depend on the vortex strength, size and position. Referring to the kinetic-energy spectrum, we indicate that both the large- and small-scale vortices are the primary mechanism for the energy transfer between the fluid and beam, leading to the beam oscillatory motion, with the contribution from the large-scale vortices being higher. We investigate the effect of fluid properties such as activity, viscosity and elastic constant on the oscillation frequency. We show that the intensification of the activity increases peak frequency, and there is a linear correlation between the peak frequency and activity. We further demonstrate the reciprocal relationship between viscosity and peak frequency. Subsequently, we relate the increase and decrease in the peak frequency to the energy injection/dissipation by activity/viscosity. Moreover, we reveal the negligibly small dependency of beam peak frequency on the elastic constant and discuss free energy's role in accounting for this behaviour. The findings clearly demonstrate that active fluids can impose an oscillatory motion on flexible bodies, which might be used as a novel method for measuring the critical properties of active nematics.

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“…Smoothed particle hydrodynamics (SPH) is one of the most widely utilized meshfree computational approaches for modeling diverse physical fluid flow conditions [30][31][32][33][34]. He et al [32] developed a coupled weakly compressible and total Lagrangian SPH (WC-TL SPH) approach to model the interactions of elastic entities with free-surface flows.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of the Energy Efficiency Enhancement of Oscillating Water Column Wave Energy Converter Systems

2022

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This work focuses on the geometry effects over the performance of oscillating water column (OWC)-type wave energy converter (WEC) systems and searches for the OWC geometries that enhance the energy efficiencies under the same wave conditions. To analyze the hydrodynamic performances of the WEC systems, an in-house smoothed particle hydrodynamics (SPH) code based on weakly compressible fluid approach is utilized. The energy efficiency enhancement studies of the determined OWC device are carried out with a two-step geometry modification procedure. The first step starts with the validation of the free-surface elevation and orbital velocity time histories. Then, a three-by-three simulation matrix that depends on the geometrical design parameters of chamber length and front wall draft is run at three different wave conditions, and the OWC geometry that produces the maximum energy efficiency is determined. In the second step, the corner regions of the obtained optimal geometry are chamfered, and another simulation matrix is tested at the wave condition that yields maximum wave energy. It is observed in this step that the energy efficiency index can still be improved by 4.3% by only chamfering the back face of the OWC chamber. To scrutinize the physical grounds of this increase, the correlation between the time-averaged vorticity and energy efficiency is presented. Finally, the performance of the best configuration is also examined in three different wave periods, where the suggested geometry shows better performance with respect to base geometry results in all wave conditions.

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Development of smoothed particle hydrodynamics method for modeling active nematics

Cited by 5 publications

References 66 publications

On particle motion in a confined square domain filled with active fluids

On particle motion in a confined square domain filled with active fluids

Vibration induced by active nematics

A Numerical Investigation of the Energy Efficiency Enhancement of Oscillating Water Column Wave Energy Converter Systems

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