So here's the scenario: you need to add a terrific amount of fluid down a steep set of rapids which will create a simulation with an incredible amount of energy then send a raft down in to what will be an extraordinary set of class 6 rapids which no raft could navigate with occupants remaining in said vessel at the end of the ride. FLIP can do decent water sims without divergence these days.
This will cause increased memory requirements and decreased sim speed for not much gain. I recommend you stay away from divergence as it requires a divergence field and a divergence pass in the flip solver.
Yes you can carry more particles but in the end it will thin out pretty fast and just delay the effect until further down the steep river. In fact with more accurate velocities present at higher grid values may allow for even greater acceleration and velocities to be supported. The recommendations regarding bulking the sim by simply reducing the volume resolution wrt the particle scale size is fine but it will definitely change the look and not really counter the thinning of the fluid.
Your reference image shows a nice calm flat river babbling over a small shelf in to a tiny pool and then slowly carrying forward and you want your fast moving water down a steep slope to have a similar feel. It will look like muddy water with low acceleration/velocity thresholding to sludge with high acceleration/velocity thresholding. If you clamp velocity you will get unrealistic motion for the fluid affected by the velocity as you described. The fluid will thin out as the simulation progresses as your fluid accelerates just like in reality. Flip doesn't have built-in checks to acceleration and velocity by default. Gravity has accelerating effect on the sloped water to the point where it thins out and hits a terminal velocity which can be due to faster water colliding against slower water, friction against the collision surface, internal viscosity forces when the water essentially turns in to a violent mix of air and water and in extreme cases such as a waterfall, air resistance itself.
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