Offline coupling of segregated multi-physical simulations with consistent boundary conditions and source terms based on scattered data

TL;DR

This paper introduces the openCFS scattered data reader module for coupling multi-physical simulations across different programs, enabling accurate interpolation of physical fields using scattered data for improved simulation fidelity.

Contribution

The paper presents a new openCFS submodule that facilitates coupling of multi-physical simulations with consistent boundary conditions using scattered data interpolation.

Findings

Successfully applied in flow-induced sound generation studies

Enables coupling of mechanical and acoustic simulations

Provides efficient nearest-neighbor search for data interpolation

Abstract

This article presents the openCFS submodule scattered data reader for coupling multi-physical simulations performed in different simulation programs. For instance, by considering a forward-coupling of a surface vibration simulation (mechanical system) to an acoustic propagation simulation using time-dependent acoustic absorbing material as a noise mitigation measure. The nearest-neighbor search of the target and source points from the interpolation is performed using the FLANN or the CGAL library. In doing so, the coupled field (e.g., surface velocity) is interpolated from a source representation consisting of field values physically stored and organized in a file directory to a target representation being the quadrature points in the case of the finite element method. A test case of the functionality is presented in the "testsuite" module of the openCFS software called "Abc2dcsvt". This scattered data reader module was successfully applied in numerous studies on flow-induced sound generation. Within this short article, the functionality, and usability of this module are described.