DropS

DropS is a Fortran-based simulation code designed to predict the equilibrium shape of a droplet on a structured substrate. It solves the Young-Laplace equation of capillary hydrostatics augmented with a disjoining pressure term, which models the solid-liquid interactions. This approach treats the liquid-solid and liquid-vapor interfaces in a unified framework, making it particularly effective for modeling cases where the number of contact lines is a priori unknown.

Documentation

DropS has been used in several scientific papers:

• Chamakos, Kavousanakis, Papathanasiou, Soft Matter (2013)
• Chamakos, Kavousanakis, Papathanasiou, Langmuir (2014)
• Kavousanakis, Chamakos, Papathanasiou, J. Phys. Chem. C (2015)

How to Use

1. Prepare the input files:

   • GlobalParameters.txt
   • AYLParameters.txt
   • EIParameters.txt
   • CYLParameters.txt
   • ELParameters.txt

2. Compile the code:

   make

3. Run the simulation:

   ./DropS

4. The results are saved in the Results directory

Prerequisites

• Fortran compiler: Install a Fortran compiler, such as GFortran
• MUMPS Library: Ensure the MUMPS library is installed in the directory /usr/local/MUMPS
• Linux Environment: The application requires a Linux operating system for compatibility

File Descriptions

Source Files:

• DropS.f90: Main program file
• cvar.f90: Common variables module
• auxfunct.f90: Auxiliary functions
• initsol.f90: Initialization and solution reading routines
• nodnum.f90: Nodal numbering routines
• coord.f90: Coordinate transformation routines
• defpar.f90: Parameter definition routines
• tsfun.f90: Basis function evaluation routines
• eikon.solv.f90: Eikonal equation solver
• printres.f90: Result printing routines
• ew.solv.f90: Electrowetting solver
• ew.paramsolv.f90: Electrowetting solver with parametric continuation
• ayl.paramsolv.f90: Augmented Young-Laplace solver with parametric continuation
• ayl.solv.f90: Augmented Young-Laplace solver
• cyl.solv.f90: Conventional Young-Laplace solver

Input Files:

• GlobalParameters.txt: Global parameters for the simulation
• AYLParameters.txt: Parameters for the Augmented Young-Laplace equation
• EIParameters.txt: Parameters for the Eikonal equation
• CYLParameters.txt: Parameters for the Conventional Young-Laplace equation
• ELParameters.txt: Parameters for the Electrowetting simulation

License

DropS is distributed under the terms of MIT License. © 2024 Nikolaos Chamakos.