Mometum Exchange by Epsilon

[Sonia Akter]

Hi,
I am new in openLB and trying to do a simulation of free surface with parcle simulation. But i want to do the particle density lower than water. But when I do so, the parcle is moving upward. I am not getting the code how to decouple the particle water interaction at solid surface.

thanks

[mathias]

You can adjust that with setting the https://en.wikipedia.org/wiki/Buoyancy -Force. That can be positive or negative.. see our particle code examples..

[Sonia Akter]

I checked with that but didnt get like where need to modify cz in the settling3D case if i make density of particles lower to water then it goes up. How to resolve that issues.
Thanks

[mathias]

Please chech that line in the code:

Vector externalAcceleration = {.0, .0, -T(9.81) * (T(1) – physDensity / cubeDensity)};

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