CompressibleInertialCoupling

The CompressibleInertialCoupling integrator implements a fluctuating hydrodynamics method for simulating particles coupled to a compressible fluid. This integrator is a wrapper around the UAMMD ICM_Compressible integrator.

For more details on the underlying method, please refer to the UAMMD ICM_Compressible documentation.

type: FluctuatingHydrodynamics, CompressibleInertialCoupling
parameters:
- timeStep: real: Time step \([time]\)
- temperature: real: Temperature of the system \([energy]\)
- shearViscosity: real: Shear viscosity of the fluid \([pressure \cdot time]\)
- bulkViscosity: real: Bulk viscosity of the fluid \([pressure \cdot time]\)
- speedOfSound: real: Speed of sound in the fluid \([distance/time]\)
- density: real: Density of the fluid \([mass/distance^3]\)
- hydrodynamicRadius: real: Hydrodynamic radius of the particles \([distance]\)
- cellDimX, cellDimY, cellDimZ: int: Number of cells in each direction
- initialCondition: string: Initial condition for the fluid (default: “none”)

Example:

"compressibleICM":{
  "type":["FluctuatingHydrodynamics","CompressibleInertialCoupling"],
  "parameters":{
    "timeStep": 0.01,
    "temperature": 1.0,
    "shearViscosity": 1.0,
    "bulkViscosity": 1.0,
    "speedOfSound": 10.0,
    "density": 1.0,
    "hydrodynamicRadius": 0.5,
    "cellDimX": 32,
    "cellDimY": 32,
    "cellDimZ": 32,
    "initialCondition": "none"
  }
}

Note

This integrator requires that the particle group contains all particles in the system.

Warning

The initialCondition parameter currently only supports the “none” option, which initializes the fluid with uniform density and zero velocity.