Relaxation Parameters

Relaxation parameters

• relaxation_steps (default 0)
  • Number of iterations for relaxation
  • Typical values depend on relaxation timescales of the problem and value of β in the relaxation force;
• relaxation_beta (default 10^-6)
  • Parameter in relaxation force that leads to a change in velocities of dv/dt = -(β + γ v²) v
  • Should be positive and on the order of 1/τ where τ is a problem-dependent relaxation time scale
• relaxation_gamma (default 0)
  • Parameter in relaxation force that leads to a change in velocities of dv/dt = -(β + γ v²) v
  • Should be positive and on the order of 10^-2 β/⟨δv²⟩ where ⟨δv²⟩ is the amplitude of velocity fluctuations
• relaxation_repulsion_radius (default 0.25)
  • Introduces particle repulsion if particles are closer than the radius to prevent particle pairing
  • In units of smoothing length
• relaxation_repulsion_gamma (default 0)
  • Related to strength of particle repulsion if they are within the repulsion radius