Question

What is the total velocity/force on a particle in fluid?

Answer 1

HEYA!!!   HERE IS YOUR ANSWER,   > If there is a force only on the particle, then you should simulate Brownian motion with an additional vector in the direction of the particle force.   > Obviously the intensity will determine how quickly a particle will move through the fluid.  > Rather if the velocity is being applied to all particles, then all particles will have this additional vector for all collisions, which is likely going to get you something similar to a stream flow on a larger scale.  > In either case, you should be able to simulate this movement fairly accurately by providing random direction vectors to your particle in combination with a single constant drag vector.   HOPE IT HELPS YOU, THANK YOU.☺️

Answer 2

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If there is a force only on the particle, then you should simulate Brownian motion with an additional vector in the direction of the particle force. Obviously the intensity will determine how quickly a particle will move through the fluid.

Rather if the velocity is being applied to all particles, then all particles will have this additional vector for all collisions, which is likely going to get you something similar to a stream flow on a larger scale.

In either case, you should be able to simulate this movement fairly accurately by providing random direction vectors to your particle in combination with a single constant drag vector.

I hope that's clear, but let me know if you need clarifications.

Edit: If all particles have a general drag vector added, then this means every hit with your particle is going to accumulate this force, so the end effect is that the particle is going to go towards the drag vector. Imagine throwing a ball with the wind blowing. Even if you throw it against the wind, the ball tends to want to go with it.

If the particle is large with respect to the others, this only means that it will have more frequent collisions. If it is large, then presumably it is also heavier, and so the random forces would be both more frequent and less intense.

Edit 2: If the particle is significantly larger than the water particles, then you should completely exclude Brownian motion. If you think about it, the particle when moving with the water is having a constant vector applied to it by the water. A particle would have a force applied inversely proportional to the difference between the fluid drag force and the current force being applied on the particle.

Just be mindful of the fact that it isn't an acceleration, just a push, with less force getting applied the faster the particle begins to move with the fluid until the particle begins to move with the inertia of the fluid.


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