Hello,

How can I simulate the settling of a tracer (additional variable) under gravity in a viscous fluid? It seems that I can not make the fluid density a function of the AV.

Thanks!

I figured it out... need to define a fluid with variable composition mixture. Then add two fluids. One fluid is the fluid with a density equal to the original fluid, the other one is the fluid including the additional density of the tracer. Then activate buoyancy, constraint the original fluid and include kinematic diffusivity for the tracer. Then there is no need for an additional variable. Anyway, this seems to work well, but suggestions are welcome.