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Immersed boundary-lattice Boltzmann mesoscale method for wetting problems.

Elisa Bellantoni1,2,3, Fabio Guglietta2, Francesca Pelusi4

  • 1Cyprus Institute, Computation-based Science and Technology Research Center, The , 20 Konstantinou Kavafi Street, 2121 Nicosia, Cyprus.

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Summary
This summary is machine-generated.

We developed a new computational model for droplet-solid interactions using hybrid immersed boundary-lattice Boltzmann methods. This model accurately simulates various wetting behaviors without parameter precalibration, improving droplet dynamics studies.

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Area of Science:

  • Computational physics
  • Fluid dynamics
  • Materials science

Background:

  • Simulating droplet-solid interactions is crucial for understanding phenomena like wetting.
  • Existing computational models often struggle with numerical instabilities and require extensive parameter tuning.
  • Accurate modeling of the droplet interface and wetting interactions remains a challenge.

Purpose of the Study:

  • To develop a novel mesoscale computational model for droplet-solid interactions.
  • To accurately simulate diverse wetting behaviors, from hydrophobic to hydrophilic.
  • To improve the stability and reduce the calibration needs of existing models.

Main Methods:

  • Hybrid computational approach combining immersed boundary (IB) and lattice Boltzmann (LB) methods.
  • IB method models the nonideal sharp droplet interface.
  • LB scheme simulates inner and outer fluids, with a novel interaction force for mesoscale wetting.
  • Interaction force provides interface profile regularization near the contact line, preventing numerical instabilities.

Main Results:

  • The model successfully simulates a wide range of wetting interactions without precalibration.
  • Validation against analytical results confirms accurate prediction of droplet shape at equilibrium.
  • Scaling laws for droplet spreading dynamics are accurately reproduced.

Conclusions:

  • The proposed hybrid IB-LB model offers a robust and versatile tool for mesoscale simulations of droplet-solid interactions.
  • The novel interaction force significantly enhances model stability and applicability across different wetting regimes.
  • This work advances the simulation capabilities for wetting phenomena in various scientific and engineering fields.