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Fluid-structure interaction with the entropic lattice Boltzmann method.

B Dorschner¹, S S Chikatamarla¹, I V Karlin¹

¹Aerothermochemistry and Combustion Systems Lab, Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland.

Physical Review. E

|March 18, 2018

Summary

This summary is machine-generated.

We present a novel fluid-structure interaction (FSI) method using the entropic multi-relaxation time lattice Boltzmann (KBC) model and finite element analysis (FEA). This robust approach is validated for complex FSI and multiphase flows, including droplet impacts.

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Area of Science:

Computational fluid dynamics
Multiphase flow modeling
Solid mechanics

Background:

Fluid-structure interaction (FSI) is crucial in many engineering applications.
Accurate simulation of FSI, especially with multiphase flows, presents significant computational challenges.
Existing models often struggle with complex boundary conditions and multiphase phenomena.

Purpose of the Study:

To introduce and validate a novel FSI scheme.
To extend the scheme to handle multiphase flows.
To demonstrate the robustness of the entropic multi-relaxation time lattice Boltzmann (KBC) model for complex FSI.

Main Methods:

Coupling of the entropic multi-relaxation time lattice Boltzmann (KBC) model for fluid dynamics with a nonlinear finite element solver for structural dynamics.
Validation against existing literature data for challenging FSI scenarios.
Extension of the KBC model to multiphase flows and its coupling with a finite element method (FEM) solver.

Main Results:

The proposed FSI scheme demonstrates validity across various challenging setups.
The KBC model is successfully extended to simulate multiphase flows.
Simulations of droplet impact on elastic superhydrophobic surfaces confirm the model's robustness and viability for complex FSI.

Conclusions:

The entropic multi-relaxation time lattice Boltzmann (KBC) model offers a robust and viable approach for complex FSI simulations.
The coupled KBC-FEM scheme provides accurate predictions for both single and multiphase FSI problems.
This work paves the way for advanced simulations of intricate fluid-structure interactions in diverse engineering fields.