This is a test to see how 2 liquids of different densities would interact. Each fluid also has separate viscosity settings.

To get this working I created a volume in sops, scattered points inside the volume, and then gave them custom point attributes to describe density, and viscosity. The water and mud were each assigned point groups, and then it was possible to separate them and assign the correct point attributes.

The mud has a varying viscosity from 100 to 1000,000 which creates the clumps within the mud. This is set in an attribute VOP in sops, and is driven by a random noise.

In dops the particles are fed into a Flip Object node, and the initial data input type is set to Particle Field to pick up the points created in sops. I also matched the particle separation value in the Flip Object node to the Points from Volume node used to created the points.

The liquids were meshed in Houdini and exported to Max using alembic.

The scene was rendered with Vray using a single dome light set to image based lighting with an HDR used for lighting and reflections.