Intact.Simulation for Grasshopper allows importing geometries defined as OpenVDB volumes.

Use the Read Volume block to read a VDB volume from a file.

The VDB volume must be stored as a FloatGrid. The VDB volume can be used directly as a geometry input to a Component block for simulation.

📌 See example application Ex-5: Using VDB implicits for lattice infill

The easiest way to associate units with an OpenVDB model is to set the Rhino document units to the desired length units.