Sometimes I needed to gradually decrease the SPH-based particles velocity until they're completely stopped. A bounded Drag daemon is an effective way to apply a 'braking' force to your particles, but if you want to apply such forces in a smooth & progressive way, you may find interesting the attached script that I made as an Events script.
Press Ctrl + F2 to open up Simulation Events window and right clic over Frames Post, then select Add Script from file.
Select the attached code and make sure to replace the "Circle01" string with your emitter's name (you can edit the script in the Simulation Events window by simply doble clicking on it).
Params:
increment is the reduction factor of the velocity. Higher values means less reduction, for instance 0.99 will barely reduce the velocity frame by frame all along the timeline, while 0.10 will drasticly reduce the velocity of your particles in a short time.
threshold stands for the minimum velocity of the particle prior to get completely frozen.
minlife is the minimum life (in seconds) of the particle prior to apply the braking force.
You'll have noticed that the particles are frozen by setting up their velocity to 0,0,0 (what is described in the script as 'zero_velocity'). Once these particles are completely stopped they can still react and move if other particles collide with them. However you may want that once the particles are stopped in a first term, they keep completely frozen even though other particles / forces collide with them. In that case you just need to uncomment the particle.freeze()line by removing ## symbols and add them to the previous line in order to comment the 'set velocity to zero_velocity' instruction.
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