{

    "materials": [
        {
            "id": 0,
            "type": "Newtonian2D",
            "density": 1000,
            "bulk_modulus": 2.2e9,
            "dynamic_viscosity": 8.9e-5,
            "incompressible": false
        }
    ]

}

• "id" is the material ID corresponding to a subset (or all) of the generated material points.
• "type" is either "Newtonian2D" or "Newtonian3D".
• "density" is material density.
• "bulk_modulus" is the constant elastic parameter for fluid bulk modulus.
• "dynamic_viscosity" is fluid dynamic viscosity.
• "incompressible" flag is set true for incompressible materials.

Detaial of the constitutive equations for Newtonian fluids are provided in [1].

References

[1] Reddy, J. N. (2014). An Introduction to Nonlinear Finite Element Analysis: with applications to heat transfer, fluid mechanics, and solid mechanics. OUP Oxford.