Generalized and high-efficiency arbitrary-positioned buffer for smoothed particle hydrodynamics

TL;DR

This paper introduces a novel, efficient buffer for smoothed particle hydrodynamics that simplifies particle management at arbitrary in/outlets through coordinate transformation and localized particle checks, validated in complex flow scenarios.

Contribution

The paper presents a generalized buffer technique for SPH that improves efficiency and versatility in handling particles at arbitrary in/outlets using coordinate transformation and local particle filtering.

Findings

Effective in 2D and 3D complex flows

Reduces computational cost significantly

Handles arbitrary in/outlet configurations

Abstract

This paper develops an arbitrary-positioned buffer for the smoothed particle hydrodynamics (SPH) method, whose generality and high efficiency are achieved through two techniques. First, with the local coordinate system established at each arbitrary-positioned in-/outlet, particle positions in the global coordinate system are transformed into those in it via coordinate transformation. Since one local axis is located perpendicular to the in-/outlet boundary, the position comparison between particles and the threshold line or surface can be simplified to just this coordinate dimension. Second, particle candidates subjected to position comparison at one specific in-/outlet are restricted to those within the local cell-linked lists nearby the defined buffer zone, which significantly enhances computational efficiency due to a small portion of particles being checked. With this developed buffer, particle generation and deletion at arbitrary-positioned in- and outlets of complex flows can be handled efficiently and straightforwardly. We validate the effectiveness and versatility of the developed buffer through 2-D and 3-D non-/orthogonal uni-/bidirectional flows with arbitrary-positioned in- and outlets, driven by either pressure or velocity boundary conditions.