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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Pressure outflow boundaries for sph and coupling sph to finite volume methods
Pressure outflow boundaries for sph and coupling sph to finite volume methods
Author : Paul H.L. Groenenboom*, Andrey Mezentsev†
ABSTRACT
Smoothed Particle Hydrodynamics (SPH) is a method well suited to simulate dynamic flow when
moving interfaces or free surfaces are present [1,2]. In contrast, the finite volume (FV) method may
be the best choice for (viscous) flow with boundary layers but without interfaces [3]. Hence, it would
be beneficial to couple SPH and FV. Since SPH is a Lagrangean approach, linking it to the Eulerian
FV method yields a serious algorithmic and software engineering challenge. A first step for coupling
is to transfer fluid from the SPH domain to the FV model. This requires development of an outflow
algorithm for holes in the boundary of SPH domains against a non-constant pressure field as well as
the transfer of flow data from moving SPH outflow openings to a fixed FV inflow surface.
Since SPH does not know the concept of faces, numerical algorithms have been developed to evaluate
the pressure force acting on the outflow area and to distribute this force over relevant particles. The
orifice geometry is updated during the simulation in order to account for wall motion resulting from
fluid-structure interaction [4]. Particles inside the reservoir in the proximity of the orifice will get a
part of the force. Examples are outflow from a large container into pipes or blood flow from the left
ventricle of a human heart into the aorta.
The orifice geometry and the computed flux define the fluid flow entering the domain of an
independent numerical simulation. When the pressure at the interface computed by the FV method is
returned to the SPH outflow a two-way coupling is established.
Details of the SPH outflow boundary algorithm and of the data exchange and mapping procedures
will be discussed. Special attention has been given to efficient software engineering of mapping and
data exchange workflow, focusing on numerical data exchange between highly inhomogeneous data
structures of SPH and FVM solvers. Object Oriented concept of an abstract solver data exchange
interface is shortly discussed [5], based on the efficient polymorphic interface class hierarchy,
specifically designed for the data exchange process. Advantages and implications of abstract objects
implementation are also discussed. Some comparisons with traditional procedural software
engineering approaches are provided.
File Size : 462,852 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 13/08/2015
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