Technical Sciences https://czasopisma.uwm.edu.pl/index.php/ts <p>Technical Sciences is a peer reviewed research journal published in English by the Publishing House of the University of Warmia and Mazury in Olsztyn (Poland). Journal has been published continually since 1998. Since 2021, the journal Technical Sciences has been published as a yearbook. In the previous period, from 1998 to 2010, it was also published as an annual. In 2011 and 2012 the journal was published as a biannual and from 2013 to 2020 as a quarterly. (<a href="https://czasopisma.uwm.edu.pl/index.php/ts/about">more</a>)</p> Uniwersytet Warmińsko-Mazurski w Olsztynie en-US Technical Sciences 1505-4675 Application of frame motion and mesh motion techniques for determining the torque of a Rushton turbine https://czasopisma.uwm.edu.pl/index.php/ts/article/view/12218 <p>The article presents experimental and numerical studies of the torque of a Rushton tur­bine impeller operating in a cylindrical tank without partitions. The analyses were carried out on a laboratory scale for one system geometry and five impeller rotational speeds. Numerical calculations were performed using the Multiple Reference Frame (MRF) and Sliding Mesh (SM) methods in combination with the Volume of Fluid (VoF) model, with an analysis of the influence of mesh density performed prior to the main calculations. The simulations were performed in the ANSYS Fluent environment, while the experimental measurements were performed using the IKA EUROSTAR 60 control drive. The results obtained showed good qualitative agreement of the torque characteristics as a function of rotational speed, with simultaneous quantitative discrepancies consisting in obtaining higher torque values in numerical simulations compared to the experiment. These discrepancies may result from the limitations of the RANS approach in mapping global vor­tex motion and free surface deformation of the liquid, as well as from measurement uncertainties, which indicates further directions for research.</p> Michał Duda Wojciech Sobieski Copyright (c) 2026 Michał Duda, Wojciech Sobieski http://creativecommons.org/licenses/by/4.0 2026-03-19 2026-03-19 29 5 23 10.31648/ts.12218