Direct Numerical Aeroacoustics for low Mach numbers using one Unstructured Grid

Direct Numerical Aeroacoustics for Low Mach Numbers Using One Unstructured Grid

Using an unstructured grid, for which the mesh size is adapted to the local flow and acoustic solution, one can reduce the number of unknowns needed for a direct aeroacoustic simulation. The compressible Navier-Stokes equations for Mach numbers 0 < M < 1 are considered. However, the unstructured grid together with the increasing stiffness of the problem for M → 0 reveals new numerical challenge...

The Multiple Pressure Variables Method for Fluid Dynamics and Aeroacoustics at Low Mach Numbers

The incompressible limit of a compressible fluid, when the Mach number tends to zero, is a singular limit due to the fact that the governing equations change their type. The propagation rate of the pressure waves become infinite. Based on asymptotic results the multiple pressure variables (MPV-) method is reviewed as it may be used for the construction of numerical methods in this low Mach numb...

Numerical Simulation of Unsteady Flows using Unstructured Grid Method

1. Introduction A great variety of flows with importance to practical engineering applications are inherently unsteady and virtually all of the Newtonian fluid flows in nature are turbulent. Therefore, it is natural and unavoidable to deal with unsteady turbulent flows when Computational Fluid Dynamics (CFD) techniques are applied to engineering design and industrial use. CFD for general fluid ...

Entropy Splitting for High Order Numerical Simulation of Vortex Sound at Low Mach Numbers

An Unstructured - Grid , Parallel , ProjectionSolver for Computing Low - Speed FlowsMark

This paper presents an overview of the issues associated with applying a domain-decomposition message-passing paradigm to the parallel implementation of both explicit and semi-implicit projection algorithms. The use of an element-based domain decomposition with an eecient solution strategy for the pressure eld is shown to yield a scalable, parallel solution method capable of treating complex ow...