Related Experiment Videos
Nonreflecting boundaries for ultrasound in fluctuating hydrodynamics of open systems
R Delgado-Buscalioni1, A Dejoan
1Departamento Física Teorica de la Materia Condensada, Universidad Autónoma de Madrid, Campus de Cantoblanco, Madrid, E-28049, Spain. rafael.delgado@uam.es
Abstract:
We present a formulation for nonreflecting boundaries in fluctuating hydrodynamics. Nonreflecting boundary conditions are designed to evacuate sound waves out of the computational domain, thus allowing one to deal with open systems and to avoid finite size effects associated with periodic boundaries. Thermodynamic consistency for the fluctuation of the total mass and momentum of the open system is ensured by a fluctuation-dissipation balance which controls the amplitude of the sound waves generated by stress fluctuations near the boundary. We consider equilibrium and out-of-equilibrium situations (forced sound) in liquid water at ambient conditions and argon ranging from gas to liquid densities. Nonreflecting boundaries for fluctuating hydrodynamics make feasible simulations of ultrasound in microfluidic devices.
Related Concept Videos
Boundary Layer Characteristics
Steady, Laminar Flow Between Parallel Plates
Reflection of Waves
Magnetostatic Boundary Conditions
Laminar and Turbulent Flow
Electrostatic Boundary Conditions
The surface integral of an electric field is given by Gauss's law in integral form and is related to...