obviously you could be right and the airflow around your object is not “turbulent enough” in which case we’d need to go deeper into your simulation settings. But what makes you so sure that it’s the simulation settings and not Paraview.
Before diving into the simulation settings, you could try setting the source of the Stream Tracer filter into the center of where you expect the turbulent wakes / vortex to appear. That can result in very different streamline visualization, e.g. I quickly made a demo with this project https://www.simscale.com/projects/Milad_Mafi/aerodynamics_analysis_of_a_sports_car_1
Where I located the source of the stream tracer differently (once in front, once behind the car, don’t have a screenshot of the second one)
Does that help?