sarkas.tools.observables.calc_pressure_tensor

sarkas.tools.observables.calc_pressure_tensor(vel, virial, species_mass, species_np, box_volume, dimensions)

Calculate the pressure tensor.

Parameters

• pos (numpy.ndarray) – Particles’ positions.

• vel (numpy.ndarray) – Particles’ velocities.

• acc (numpy.ndarray) – Particles’ accelerations.

• species_mass (numpy.ndarray) – Mass of each species.

• species_np (numpy.ndarray) – Number of particles of each species.

• box_volume (float) – Volume of simulation’s box.

Returns

• pressure (float) – Scalar Pressure i.e. trace of the pressure tensor

• pressure_tensor (numpy.ndarray) – Pressure tensor. Shape(no_dim,``no_dim``)