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arxiv: 2605.18242 · v1 · pith:NN3C2T44new · submitted 2026-05-18 · ❄️ cond-mat.soft

Modulating hydrodynamic flow by modifying the active patch of a colloid

Om Vandra , Suhal Siva Ratan T. N. , Hemant Giri , Manish Modani , Vijay Chikkadi , Raghunath Chelakkot , Apratim Chatterji This is my paper

Pith reviewed 2026-05-20 00:22 UTC · model grok-4.3

classification ❄️ cond-mat.soft
keywords active colloidshydrodynamic flowsmulti-particle collision dynamicspusher and pullerself-propulsionboundary conditionspatchy particles
0
0 comments X

The pith

Varying the size of an active surface patch on a colloid switches its generated hydrodynamic flow from pusher-type to puller-type.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper develops a simulation method to model fluid flows around colloids with a localized active patch that drives the surrounding fluid. By changing the area of this patch, the far-field flow pattern transitions from one that pushes fluid outward along the axis to one that pulls it inward. A hybrid boundary condition is introduced to handle the interaction between the multi-particle collision fluid and the colloid surface accurately. This allows the otherwise Brownian particle to become self-propelled while conserving momentum. Understanding this control over flow type matters because it opens ways to tune hydrodynamic interactions in suspensions of active particles.

Core claim

The authors show that systematically varying the surface area of the active patch on the colloid changes the nature of the generated flow field from that of a pusher to a puller. The model uses multi-particle collision dynamics with momentum exchange at the active surface, where fluid is driven radially away from or toward the patch, imparting opposite momentum to the colloid for self-propulsion.

What carries the argument

The active surface patch whose area is varied to control the flow field type, implemented via a hybrid boundary condition that combines no-slip enforcement with stochastic momentum exchange.

If this is right

  • Self-propulsion emerges in the Brownian colloid due to the surface-driven flow.
  • The model enables study of effective hydrodynamic interactions between active and passive colloids by adjusting patch size.
  • Interactions between two active colloids can be modulated similarly.
  • Future simulations can explore collective behaviors in systems with tunable pusher or puller characteristics.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • This patch-size control could serve as a design principle for engineering specific flow fields in synthetic active matter without changing particle shape or chemistry.
  • Experimental realizations with patchy colloids activated by light or chemical gradients might reproduce the pusher-to-puller transition.
  • Such modulation might affect the stability of clusters or the rheology of active suspensions in ways not captured by fixed-type approximations.

Load-bearing premise

The hybrid boundary condition correctly enforces no-slip while allowing momentum exchange between the MPC fluid and colloid surface without introducing artifacts that alter the far-field flow type.

What would settle it

Direct measurement or simulation of the velocity field far from the colloid for patches of varying fractional area, checking if the flow signature crosses from pusher (outward along axis) to puller (inward).

Figures

Figures reproduced from arXiv: 2605.18242 by Apratim Chatterji, Hemant Giri, Manish Modani, Om Vandra, Raghunath Chelakkot, Suhal Siva Ratan T. N., Vijay Chikkadi.

Figure 1
Figure 1. Figure 1: Mean kinetic energy (KE) of the SRD fluid for [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: (a) Poiseuille flow velocity profiles vflow for bounce-back, stochastic, and hybrid boundary conditions without virtual particles. A thermostat is applied only for the bounce-back case. (b) Corresponding profiles with virtual particles at the walls; here, a thermostat is applied for all three boundary conditions. The analytical no-slip profile is shown for reference. Panels (c) and (d) present zoomed-in vi… view at source ↗
Figure 3
Figure 3. Figure 3: (a) Probability distributions p(V ) and p(Ω) of the translational and rotational speeds of a passive colloid coupled to an MPCD fluid. The speeds are normalized as V /⟨V ⟩ and Ω/⟨Ω⟩, where ⟨V ⟩ = p 3kBT /Mcol and ⟨Ω⟩ = p 3kBT /Icol with kBT = 1 kBT0. The solid black lines denote the corresponding Maxwell–Boltzmann dis￾tributions. For this, calculate the updated force on the colloid f(t + ∆tmd) and use it t… view at source ↗
Figure 5
Figure 5. Figure 5: Schematic of cross section of the active col [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Probability distribution of the velocity com [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 8
Figure 8. Figure 8: Kinetic energy (KE) of the fluid in the vicin [PITH_FULL_IMAGE:figures/full_fig_p010_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: (a) Mean-square displacement (MSD) of a sin [PITH_FULL_IMAGE:figures/full_fig_p011_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Flow profiles around an active colloid for different values of [PITH_FULL_IMAGE:figures/full_fig_p012_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Flow profiles for an active colloid with [PITH_FULL_IMAGE:figures/full_fig_p013_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Fluid flow profiles around an active colloid [PITH_FULL_IMAGE:figures/full_fig_p014_12.png] view at source ↗
Figure 15
Figure 15. Figure 15: We also show the y component of the velocity of fluid v y f low along a line in the ˆy direction, i.e. perpen￾dicular to ˆe along a line next to the lateral axis. Data is plotted for different values of θ. The values of θ are given in the legend. Note that the fluid velocity inside the sphere is marked as zero, as there is no fluid inside. The top figure labeled (a) shows the flow magnitude for the outwar… view at source ↗
Figure 16
Figure 16. Figure 16: Probability distribution of the velocity of par [PITH_FULL_IMAGE:figures/full_fig_p017_16.png] view at source ↗
read the original abstract

We have developed a simulation model to study the hydrodynamic flow fields around Brownian colloidal particles with an active surface patch. Hydrodynamics is introduced by modeling low-Reynolds-number fluid flows around a colloid using multi-particle collision (MPC) dynamics and allowing momentum exchange between the MPC fluid and the colloid. This approach provides good estimates of both near- and far-field flows around the colloid. The size of the active patch is varied to generate different fluid flow fields around the colloid. In this framework, the fluid in the vicinity of the active patch is driven radially away from (or toward) the surface, and an equal and opposite momentum is imparted to the colloid to ensure momentum conservation. The resulting surface-driven flow generates self-propulsion of the particle, thereby converting an otherwise Brownian colloid into an active Brownian particle. Interestingly, as we systematically vary the surface area of the active patch on the colloid, the nature of the generated flow field changes from that of a pusher to a puller. To model such surface activity-driven flows, we developed a hybrid boundary condition that ensures a no-slip condition while incorporating momentum exchange between the flowing fluid and the colloid surface. This scheme integrates the advantages of bounce-back and stochastic boundary conditions while mitigating their respective limitations. Thus, in future studies, the effective hydrodynamic interactions between an active and a passive colloid, or between two active colloids, can be modulated by adjusting the size of the active patch.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript presents an MPC-dynamics simulation of a Brownian colloid equipped with a tunable active surface patch. Radial activity is imposed on the patch while an equal-and-opposite momentum is imparted to the particle; a hybrid bounce-back/stochastic boundary condition is introduced to enforce no-slip at the colloid surface while permitting momentum exchange. Systematic variation of the active-patch area fraction is reported to drive a transition in the far-field flow from pusher-type to puller-type, thereby converting the particle into an active Brownian swimmer whose hydrodynamic signature can be modulated by patch size.

Significance. If the reported pusher-to-puller crossover survives quantitative validation, the work supplies a concrete, experimentally accessible handle (patch area) for tuning the hydrodynamic dipole of active colloids. This could directly inform design of micro-swimmers and studies of hydrodynamic interactions between active and passive particles. The hybrid boundary-condition scheme itself may be reusable in other MPC studies of surface-driven flows.

major comments (2)
  1. [hybrid boundary condition implementation] Section describing the hybrid boundary condition: the claim that the scheme 'ensures a no-slip condition while incorporating momentum exchange' without altering the far-field flow type is load-bearing for the central result, yet no quantitative test is provided that the extracted force-dipole coefficient retains the correct sign for patch radii below ~0.4R. In MPC, local momentum injection on the lattice can generate spurious higher-order multipoles that decay slower than 1/r^3; without a direct comparison to analytic squirmer solutions or a convergence study versus collision-cell size, it remains possible that the observed crossover is an artifact of the discrete implementation rather than a physical effect of patch area.
  2. [results on flow fields] Results section on flow-field characterization: the transition from pusher to puller is asserted on the basis of visual or qualitative inspection of streamlines, but the manuscript supplies neither error bars on the measured velocity fields nor an explicit definition of the dipole sign (e.g., the coefficient of the 1/r^2 term in the far-field expansion). Without these, the sharpness and robustness of the reported crossover cannot be assessed.
minor comments (2)
  1. [abstract] The abstract states that 'an equal and opposite momentum is imparted to the colloid'; a brief clarification of how this is implemented numerically (e.g., via direct force application or velocity rescaling) would improve reproducibility.
  2. [figures] Figure captions should explicitly state the patch area fractions shown and the distance at which the flow field is sampled to distinguish near-field from far-field behavior.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their thorough review and valuable feedback on our manuscript. We appreciate the opportunity to clarify and strengthen our presentation of the hybrid boundary condition and the flow field analysis. Below, we provide detailed responses to the major comments and indicate the revisions we will implement.

read point-by-point responses

  1. Referee: [hybrid boundary condition implementation] Section describing the hybrid boundary condition: the claim that the scheme 'ensures a no-slip condition while incorporating momentum exchange' without altering the far-field flow type is load-bearing for the central result, yet no quantitative test is provided that the extracted force-dipole coefficient retains the correct sign for patch radii below ~0.4R. In MPC, local momentum injection on the lattice can generate spurious higher-order multipoles that decay slower than 1/r^3; without a direct comparison to analytic squirmer solutions or a convergence study versus collision-cell size, it remains possible that the observed crossover is an artifact of the discrete implementation rather than a physical effect of patch area.

    Authors: We acknowledge the referee's valid concern regarding potential numerical artifacts in the MPC simulations. The hybrid boundary condition was designed to enforce no-slip while allowing momentum exchange, and our tests during development indicated that the far-field behavior aligns with expectations. However, to address this rigorously, in the revised manuscript we will add a quantitative comparison of the simulated velocity field for small patch sizes (below 0.4R) to the analytic squirmer solution, confirming the correct (negative) sign of the force-dipole coefficient. We will also include a convergence study varying the collision cell size to demonstrate that the pusher-to-puller transition is not affected by discretization effects. These additions will provide stronger evidence that the crossover is physical. revision: yes

  2. Referee: [results on flow fields] Results section on flow-field characterization: the transition from pusher to puller is asserted on the basis of visual or qualitative inspection of streamlines, but the manuscript supplies neither error bars on the measured velocity fields nor an explicit definition of the dipole sign (e.g., the coefficient of the 1/r^2 term in the far-field expansion). Without these, the sharpness and robustness of the reported crossover cannot be assessed.

    Authors: We agree that a more quantitative presentation would enhance the clarity and credibility of our results. In the revised version, we will include error bars on the velocity field data, derived from averages over an ensemble of independent simulation runs. Additionally, we will explicitly define and report the dipole coefficient by fitting the far-field velocity to the expected 1/r^2 decay term and extracting its sign and magnitude as a function of patch area. This will allow readers to evaluate the sharpness of the transition and its statistical robustness. revision: yes

Circularity Check

0 steps flagged

Direct MPC simulation of patch-size variation yields pusher-to-puller transition with no definitional or self-citation reduction

full rationale

The manuscript reports results from explicit multi-particle collision dynamics simulations in which the active patch area is an independent input parameter that is varied systematically. The observed change in far-field flow character (pusher versus puller) is an output of the numerical integration under the stated hybrid boundary condition; no equation, fitted coefficient, or uniqueness theorem is defined in terms of the same flow-type classification, and no load-bearing step reduces to a prior self-citation or ansatz that already encodes the target result. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The model rests on standard low-Reynolds-number hydrodynamics and MPC collision rules; no new particles or forces are postulated. A few simulation parameters (patch size, activity strength) are varied but not fitted to match a target result.

free parameters (2)
  • active patch area fraction
    Varied systematically to observe flow-type transition; chosen by hand rather than derived.
  • activity strength (radial velocity at patch)
    Sets the magnitude of fluid driving; value not specified in abstract.
axioms (2)
  • domain assumption Low-Reynolds-number flow around a sphere can be accurately captured by MPC with momentum exchange at the surface.
    Invoked when introducing the MPC model for the colloid-fluid system.
  • ad hoc to paper The hybrid boundary condition preserves both no-slip and global momentum conservation without spurious torques or forces.
    Central to the new numerical scheme described in the abstract.

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