en Rolling Stock Rolling Stock پژوهشي Research <div style="text-align: justify;">In this paper, an innovative method as a coupled numerical model is developed for assessing the interaction between wagon dynamics and transient fluid slosh. This model can be considered as a robust and effective computational tool for investigation of sloshing in tank vehicles in different tank conditions and manoeuvres. Fourth-order Runge-Kutta method is adopted for solving the 19 degrees of freedom (DOFs) wagon dynamics model. The three-dimensional model is adopted, which includes car body, bogies and wheel-axles with longitudinal, vertical, pitch, and roll vibrations. Transient fluid slosh is analyzed using the computational fluid dynamics method (CFD) based on the Navier&ndash;Stokes equations combined with the volume of fluid technique (VOF). Also, the sloshing test setup is developed for validation of the multi-phase CFD simulation. By coupling of the wagon dynamics model with the fluid slosh model, the dynamic response characteristics of the railway tanker are analyzed under straight-line braking manoeuvre. The numerical parametric study is conducted to investigate the effect of filling volume and viscosity.</div> Tank wagon,Transient fluid slosh, Wagon dynamic, Coupled model, Braking 19 33 http://ijrare.iust.ac.ir/browse.php?a_code=A-10-69-3&slc_lang=en&sid=1 Ahmad Rahmati-Alaei ahmad_rahmati@rail.iust.ac.ir 180031947532846002041 180031947532846002041 No School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran Majid Sharavi m_shahravi@iust.ac.ir 180031947532846002042 180031947532846002042 Yes School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran Masoud Samadian Zakaria mas_samadian@yahoo.com 180031947532846002043 180031947532846002043 No Mechanical Departments, Khaje Nasir University of Technology, Tehran, Iran