A method to simulate bodies suspended in a Lattice Boltzmann solvent is proposed. Iris based on a generalized reaction force that enforces no-slip boundary conditions at the fluid-body interface as the limiting case of an iterative procedure. A smooth version of the Heaviside function allows to treat spherical particles of arbitrary size and produces smooth hydrodynamic forces as particles move in the continuum. Numerical tests demonstrate the accuracy of the method in reproducing the hydrodynamic field around a single particle and the fluid-mediated forces between pairs of particles. The drag force experienced by a particle moving in a straight channel and at various Reynolds numbers is studied as a non-trivial testcase.
Incorporation of smooth spherical particles in the Lattice Boltzmann method
Melchionna S
2011
Abstract
A method to simulate bodies suspended in a Lattice Boltzmann solvent is proposed. Iris based on a generalized reaction force that enforces no-slip boundary conditions at the fluid-body interface as the limiting case of an iterative procedure. A smooth version of the Heaviside function allows to treat spherical particles of arbitrary size and produces smooth hydrodynamic forces as particles move in the continuum. Numerical tests demonstrate the accuracy of the method in reproducing the hydrodynamic field around a single particle and the fluid-mediated forces between pairs of particles. The drag force experienced by a particle moving in a straight channel and at various Reynolds numbers is studied as a non-trivial testcase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
