Simulasi Numerik Fenomena Dewetting Perubahan Lapisan Film Cair menjadi Droplet menggunakan Metode Lattice Boltzmann

PRIMA ANDREANTO, Dr. Deendarlianto, S.T., M. Eng

2020 | Skripsi | S1 TEKNIK MESIN

Perubahan lapisan film tipis menjadi droplet tunggal yang bersifat incompressible, viscous, dan transient disimulasikan menggunakan model pseudopotential Lattice Boltzmann D2Q9 dengan pendekatan Bhatnagar, Gross, dan Krook (BGK). Diskretisasi dilakukan dengan metode velocity space dan time space. Interaksi antara temperatur, tekanan, dan densitas pada droplet diformulasikan menggunakan persamaan keadaan Carnahan-Starling. Model disimulasikan dalam bahasa pemrograman FORTRAN dan divisualisasikan dalam bahasa MATLAB. Komparasi dilakukan dengan membandingkan hasil simulasi saat ini dengan paper terpublikasi pada jurnal internasional bereputasi dengan parameter-parameter : sudut kontak, beda tekanan, dan spurious current.

In the present work, the change of thin film layer into a single droplet in the form of incompressible, viscous, and transient was simulated using the pseudopotential Lattice Boltzmann D2Q9 model with the approximation from Bhatnagar, Gross and Krook. Discretization was done using velocity space and time space methods. The interaction between temperature, pressure, and density on the droplet was formulated using the Carnahan-Starling equation of state. The model was simulated in the FORTRAN programming language and then visualized in the MATLAB language. The comparation was carried-out by comparing the results of the current simulation with data from the open literature. The examined parameters were: contact angle, pressure difference, and spurious current.

Kata Kunci : Carnahan-Starling, droplet, lapisan film, Lattice Boltzmann, pseudopotential.