Abstract
A solver for compressible Navier–Stokes equations is presented in this paper. Low-storage RungeKutta schemes were adopted for time integration; on the other hand the finite volume approach available within OpenFOAM library has been adopted for space discretization. Kurganov-Noelle-Petrova approach was used for convective terms, while central schemes for diffusive ones. The aforementioned techniques were selected and tested in order to allow the possibility of solving a broad range of physical phenomena with particular emphasis to aeroacoustic and thermo-fluid dynamic problems. Indeed, that standard OpenFOAM solution techniques produce an unacceptable dissipation for acoustic phenomena computations. Non–reflective boundary treatment was also considered to avoid spurious numerical reflections. The reliability and the robustness of the solver is proved by computing several benchmarks. Lastly, the impact of the thermal boundary conditions on the sound propagation was analyzed.
Highlights
In recent years computational fluid-dynamics (CFD) was widely employed in several scientific and industrial research fields: the constant improvement and availability of computational resources allowed to face increasingly complex real–life problems
In the following we present the results in terms of the dimensionless parameters related to fluid dynamic, heat transfer and acoustic fields: the drag and lift coefficients, the Strouhal number, Sr, the Nusselt number, Nu, the fluctuating pressure, p0, and its root mean square, prms
This paper addresses the application of a finite–volume solver for compressible Navier–Stokes equations, named caafoam, which is able to fully resolve aeroacoustic waves propagation, heat transfer and their interaction with a direct numerical simulation approach
Summary
In recent years computational fluid-dynamics (CFD) was widely employed in several scientific and industrial research fields: the constant improvement and availability of computational resources allowed to face increasingly complex real–life problems. In this scenario, it is worth noting that compressible Navier-Stokes equations (NSE) can describe a broad range of scientific interest physical phenomena. Standard boundary conditions produce acoustic waves spurious reflections; to fix these issues low–dissipative discretization schemes and non–reflecting boundary treatment are strictly required, [2] For this reason in literature we can Discontinuous Galerkin (DG), [5] methods for aeroacoustics.
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