prof. dr. Jure Ravnik

Head of transport phenomena in fluid and solids laboratory


Tritok, a BEM based viscous flow solver

Tritok simulates flow and heat transfer of an incompresible viscous fluid in 3D. Velocity-vorticity formulation of Navier-Stokes eqautions is solved by the Boundary Element Method. It was written by Jure Ravnik, University of Maribor, Faculty of Mechanical Engineering, Smetanova 17, SI-2000, Maribor, Slovenia



Numerical aspects of the algorithm are explained in the following papers:

J. Ravnik, L. Skerget and Z. Zunic: Velocity-vorticity formulation for 3D natural convection in an inclined enclosure by BEM; International Journal of Heat and Mass Transfer, 51, 4517-4527, 2008;

J. Ravnik, L. Skerget and Z. Zunic: Combined single domain and subdomain BEM for 3D laminar viscous flow Eng. Anal. Bound. Elem., 2008,


Source code, documentation and examples are available for download:

TriTok, version 7.2, January 2018