Abstract: Lattice Boltzmann method is applied for the computer simulation of liquid droplets that are in contact with a solid surface. In such problems, the value of contact angle at the three-phase contact line needs to be set. To achieve this, interaction forces between fluid and solid are introduced. The simulation of the equilibrium shapes of droplets is performed. We show that the use of commonly accepted forms of the interaction between fluid and solid in LBM leads to a non-physical change of the density near the solid surface. This hinders the correct calculation of heat fluxes. A new method is proposed to control the contact angles where only the tangential components of forces acting on fluid from solid nodes are taken into account (tangential force method, TFM). Use of this method does not change the fluid density in layers adjacent to the boundary. This is important in the simulation of flows with heat transfer and electrohydrodynamic flows. The dependence of the contact angle on the parameter of fluid-solid interaction is obtained.

Cite: Kupershtokh A.L. , Medvedev D.A.
On contact wetting angles in the lattice Boltzmann method and their measurement
Eurasian Journal of Mathematical and Computer Applications. 2024. V.12. N4. P.84-91. DOI: 10.32523/2306-6172-2024-12-4-84-91 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Jul 29, 2024
Accepted:	Oct 5, 2024

Identifiers:

Web of science:	WOS:001382675400008
Scopus:	2-s2.0-85213066231
Elibrary:	76049498
OpenAlex:	W4405945370

Citing:

DB	Citing
Web of science	1
OpenAlex	1
Scopus	1

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