This study, the portable conveyor placement of ocean waste collection ships was numerically investigated by using computational fluid dynamics. Monohull ship models with different conveyor location variations are namely at the bow of the ship, on both sides of the ship, and on the bow and both sides of the ship. The three indicators used to assess ships in collecting ocean waste are flow patterns that indicate whether or not ocean waste is easy to get in closer to the conveyor, velocity contours that indicate whether or not ocean waste is approaching the conveyor fast, and ship resistance that affects fuel consumption. The results show that the conveyor on the bow model is the easiest to get the ocean waste closer to the conveyor. This model also produces the smallest ship resistance compared to other models. While the conveyor model on the bow and both sides is the fastest to make the waste approach the conveyor. This model also makes ocean waste that is not caught on the conveyor of the front ship can be caught by the conveyor on the side of the ship. However, this model produces the largest ship resistance compared to other models.