The two Lagrangian approaches demonstrate convergence with exact solutions, and the different boundary conditions are validated to be effective. Computational results show clear Doppler effects. Subsequently, sound propagation in flows with different Mach numbers is simulated with several boundary conditions including the perfected matched layers. In the second approach, both SPH and CSPM are used to solve the Lagrangian acoustic perturbation equations the particle motion and the acoustic perturbation are separated and controlled by two sets of governing equations. Meshfree Particle Methods is a comprehensive and systematic exposition of particle methods, meshfree Galerkin and partitition of unity methods, molecular dynamics methods, and multiscale methods. In the first approach, which can be regarded as a direct numerical simulation method, both standard SPH and the corrective smoothed particle method (CSPM) are utilized to solve the fluid dynamic equations and obtain pressure change directly. This study presents two Lagrangian approaches for modeling sound propagation in moving fluid. As a Lagrangian meshfree particle method, the traditional smoothed particle hydrodynamics (SPH) method has been applied in acoustic computation but in a quiescent medium. Specific examples are sound generation in the vocal track and bubble acoustics. Introducing the Lagrangian approach to acoustic simulation is supposed to reduce the difficulty in solving problems with deformable boundaries, complex topologies, or multiphase media.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |