Thin-film flows with moving contact lines: An approach to reducing computing time.

Area of Science:

• Fluid dynamics
• Computational physics
• Surface science

Background:

• Simulating thin-film flows with moving contact lines is computationally intensive.
• Existing methods often face challenges in balancing accuracy and speed.
• Efficient numerical techniques are crucial for advancing research in microfluidics and material science.

Purpose of the Study:

• To develop and validate a numerical method for reducing computation time in thin-film flow simulations.
• To enhance the efficiency of simulating fluid dynamics involving moving contact lines.
• To provide a faster computational tool for analyzing film and droplet behavior.

Main Methods:

• A numerical method was developed using a moving reference frame with non-constant velocity U(t).
• The velocity U(t) was determined by a criterion to minimize maximum height changes in critical flow zones.
• The method was tested on gravity-driven thin-film flows.

Main Results:

• The numerical method significantly reduces computational time for thin-film flows.
• Computing times were reduced by up to a factor of 13, depending on problem parameters.
• The efficiency was demonstrated in simulations of film and droplet flows.

Conclusions:

• The proposed numerical method offers substantial speed-up for thin-film flow simulations.
• This advancement can accelerate research and development in areas relying on microscale fluid dynamics.
• The moving frame approach provides an efficient strategy for handling moving contact lines in simulations.