[13] proposed developing a simple baffle solution for all unmanned aerial vehicle pesticide tanks and compared the baffle systems' impacts using primarily shaped tanks. [PERSON] et al. [31] analyzed an aeronautical sloshing problem using an alternative and simplified single degree of freedom method. They investigated vertical sloshing experimentally and theoretically. [PERSON] et al. [32] analytically studied the liquid sloshing in a cylindrical tank considering soil-structure interaction and undergoing horizontal excitation. Multiple rigid annular baffles were positioned on the rigid wall to mitigate the liquid sloshing. [PERSON] et al. [33] presented the CFD-based non-dimensional characterization of violent slosh-induced energy dissipation due to a tank under vertical excitation. The study was validated experimentally. The validated method was employed to develop scaling laws that quantify energy dissipation as a function of the most important fluid physics non-dimensional numbers. The sloshing problem is difficult to solve analytically. It is generally easier to study sloshing behavior in cylindrical or rectangular prism-shaped tanks than in tanks with complex geometry. Today, computational fluid dynamics (CFD) is used to model flows and estimate flow properties. CFD can be defined as an engineering method that enables the simulation of fluid flow, heat transfer, and other related physical phenomena with the help of computers. Moreover, this technique has been used in many different studies to analyze sloshing phenomena [9; 28; 33; 34; 35]. These techniques are used also in coastal engineering research. [PERSON] et al. [36] used an OpenFOAM model combined with wave generation waves2 Foam toolbox to investigate the hydrodynamic features of the transient gap resonance inside a narrow gap excited by focused wave groups with various spectral peak periods and focused wave amplitudes. [PERSON] et al. [37] performed simulations to investigate the effects of vessel shapes on sloshing dynamics under horizontal excitation by OpenFOAM. [PERSON] et al. [38] investigated focused wave group interactions with four different harbors. The generation and propagation of focused wave groups and their interactions with the harbor were implemented by employing the fully nonlinear Boussinesq equation model, FUNWAVE 2.0. In this study, we investigated the sloshing event in a prismatic tank for horizontal movement. We carried out theoretical studies of the sloshing phenomenon using the CFD method with the help of the ANSYS Fluent program. A 50 L rectangular prism-shaped tank was designed to examine the tank's longitudinal sloshing behavior. The effects of different baffle structures, filling rates, various excitation amplitudes, and liquid materials on the sloshing motion were investigated and analyzed. The rest of this paper is organized as follows. The governing equations, validation work, description of tank and baffle types, and numerical simulation details are briefly introduced in Section 2. We designed seven baffle structures for a tank system close to vehicle fuel tanks' dimensions. We examined the effect of baffle designs on sloshing for 50% filling depth. We applied the ES31100-01 engineering standard shaking test criteria's frequency and amplitude values as analysis input values and analyzed the sloshing behavior of seven baffled tanks and an unbaffled tank. In the second step, after evaluating the results obtained from these analyses, we examined the dynamic behavior of the three baffle structures selected according to the time domain response and the unbaffled tank structure comparatively at smaller amplitude and frequency values. Here, we conducted our analyses for 50-70% filling depth and examined the effectiveness of the baffles. At the last stage, it was determined that in the studies carried out in the literature, a single fluid type was generally used in tanks to analyse the sloshing.