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The underlying mechanisms and physics of catalytic Janus microswimmers ishighly complex, requiring details of the associated phoretic fields and thephysiochemical properties of catalyst, particle, boundaries, and the fuel used.Therefore, developing a minimal (and more general) model capable of capturingthe overall dynamics of these autonomous particles is highly desirable. In thepresented work, we demonstrate that a coarse-grained dissipativeparticle-hydrodynamics model is capable of describing the behaviour of variouschemical microswimmer systems. Specifically, we show how a competing balancebetween hydrodynamic interactions experienced by a squirmer in the presence ofa substrate, gravity, and mass and shape asymmetries can reproduce a range ofdynamics seen in different experimental systems. We hope that our general modelwill inspire further synthetic work where various modes of swimmer motion canbe encoded via shape and mass during fabrication, helping to realise the stilloutstanding goal of microswimmers capable of complex 3-D behaviour

Minimal numerical ingredients describe chemical microswimmers's 3D motion